For more information, please visit the product page. date 09/03/2015 page 1 of 33 MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER GENERAL CHARACTERISTICS • • • • • • • • • • • • 7.5~14 V input range 0.6~1.8 V programmable output high efficiency voltage tracking voltage margining active current sharing Snapshot™ parametric capture voltage/current/temperature monitoring synchronization and phase spreading remote differential voltage sense programmable soft start and soft stop fault management FEATURES • compact package vertical: 50.8 x 9.51 x 19.05 mm (2.0 x 0.37 x 0.75 in) horizontal: 50.8 x 19.05 x 10.0 mm (2.0 x 0.75 x 0.39 in) • 90 A output • adaptive algorithms • cycle-by-cycle charge management • dual phase architecture • SMBus interface • PMBus™ compatible TM Architects of Modern Power MODEL NDM3Z-90 input voltage output voltage output current output wattage (Vdc) (Vdc) max (A) max (W) 7.5~14 0.6~1.8 90 162 PART NUMBER KEY NDM3Z-90 X - X - XXX- X Base Number Module Orientation and Pin Style: HT = horizontal, through hole mount V = vertical Firmware Configuration: 000~ZZZ Package Option: A = loose parts B = tape and reel C = tray Pin Configuration: A = HT 3.56 mm pin length; V 4 mm pin length B = V 5.5 mm pin length S = SMT pin Example part number: NDM3Z-90V-A-002-A vertical module 4.0 mm pin length firmware configuration 002 loose parts package option CONTENTS Pin Descriptions................................................2 Absolute Maximum Ratings.................................4 Product Electrical Specifications...........................4 Mechanical Drawings.....................................14~15 PMBus Interface.................................................17 Operating Information.........................................20 cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 2 of 33 INTERNAL CIRCUIT DIAGRAM POWER CONNECTIONS symbol pin IO type description VIN 1A, 1B, 1C, 1D Power Input voltage GND 2A, 2B, 2C, 2D Ground Power ground VOUT 3A, 3B, 3C, 3D Power Output voltage 11, 12 N/A No connect on module N/C COMMUNICATION CONNECTIONS symbol pin IO type description +S 4A Analog Output voltage positive sense input, N/C if not used -S 4B Analog Output voltage negative sense input, N/C if not used VSET 5A Digital Output voltage pin-strap VTRK 5B Analog Voltage tracking input, N/C if not used SLRT 6A Digital SMBus alert, N/C if not used SDA 6B Digital SMBus data, pull-up resistor required even if not used SCL 7A Digital SMBus clock, pull-up resistor required even if not used FAULT 7B Digital Module fault indicator, N/C if module is stand-alone, tied together if modules are current share configured SA 8A Digital SMBus address pinstrap SYNC 8B Digital Synchronization I/O, N/C if not used PG 9A Digital Power good, pull-up resistor or configured as push-pull CTRL 9B Digital Remote control or enable, N/C if not used, internal pull-up resistor DDC 10A Digital Digital-DC Communications bus, pull-up resistor or configured as push-pull (stand-alone only) required PREF 10B Ground Pin-strap ground cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER TYPICAL APPLICATION CIRCUIT TYPICAL APPLICATION CIRCUIT - PARALLEL OPERATION cui.com date 09/03/2015 │ page 3 of 33 For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 4 of 33 ABSOLUTE MAXIMUM RATINGS parameter conditions/description min Vin input voltage digital pin voltage CTRL, DDC, SA, SLRT, SDA, SCL, SYNC, VSET, PG, FAULT analog pin voltage max units -0.3 16 V -0.3 6.0 V +S, VO, VTRK -0.3 6.5 V ground voltage differential GND, PREF, -S -0.3 0.3 V operating temperature TP1 -40 150 °C -40 150 °C storage temperature Notes: typ Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the Electrical Specification section of this specification is not implied. Configuration File The digital control circuit in this module uses a configuration file which determines the functionality and performance of the product. The Standard configuration is designed to fit most application needs and the Electrical Specification table shows parameter values of functionality and performance with the Standard configuration, unless otherwise specified. Changes in Standard configuration might be required to optimize performance in specific applications. Changes to the Standard configuration are required for current sharing operation. PRODUCT ELECTRICAL SPECIFICATION TP1 = -30 to +95 °C, VI = 7.5 to 14 V, unless otherwise specified under Conditions. Typical values given at: TP1 = +25 °C, VI = 12.0 V, max IO, unless otherwise specified under Conditions. VO defined by pin strap. Standard configuration. External CIN = 1000 μF/12 mΩ + 24 x 10 μF, COUT = 10 x 470 μF/5 mΩ + 10 x 100 μF. See Operating Information section for selection of capacitor types. Sense pins are connected to load. parameter conditions/description min input voltage (VI) input voltage rise time (VI) typ 7.5 monotonic output voltage without pin-strap (VO) max units 14 V 6 V/ms 1.2 V output voltage adjustment range (VO) 0.60 1.8 V output voltage adjustment including PMBus margining (VO) 0.54 1.98 V output voltage set-point resolution (VO) output voltage accuracy2 (VO) 0.025 including line, load, temp -1 internal resistance +S/-S to VOUT/GND (VO) %VO 1 47 +S bias current (VO) -100 -S bias current (VO) 20 %VO Ω 100 μA 20 μA 2 2 2 mV mV mV line regulation (VO) IO = max IO VO = 0.6 V VO = 1.0 V VO = 1.8 V load regulation (VO) IO = 0~100% VO = 0.6 V VO = 1.0 V VO = 1.8 V 2 2 2 mV mV mV output ripple & noise (VO) (up to 20 MHz) VO = 0.6 V VO = 1.0 V VO = 1.8 V 2.5 3.5 5.0 mVp-p mVp-p mVp-p output current (IO) 0 current limit threshold (Ilim) Notes: 100 2. For VO < 1.0 V accuracy is +/-10 mV. For further deviations see section Output Voltage Adjust using PMBus cui.com 114 90 A 125 A For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 5 of 33 PRODUCT ELECTRICAL SPECIFICATION (CONTINUED) parameter conditions/description short circuit current (ISC) RMS, hiccup mode, VO = 1.0 V, 1.5 mΩ short min A 87.6 91.4 94.3 % % % IO = max IO VO = 0.6 V VO = 1.0 V VO = 1.8 V 83.7 88.7 92.5 % % % VO = 0.6 V VO = 1.0 V VO = 1.8 V 10.5 11.5 13.1 W W W VO = 0.6 V VO = 1.0 V VO = 1.8 V 1.29 1.35 1.82 W W W 0.44 W 320 kHz input idling power (PIi) IO = 0 input standby power (PCTRL) turned off with CTRL-pin switching frequency (fSW = 1/TSW) PMBus configurable FREQUENCY_SWITCH switching frequency set-point accuracy (fSW = 1/TSW) external sync pulse width (fSW = 1/TSW) 200 640 kHz -5 5 % 150 input clock frequency drift tolerance (fSW = 1/TSW) external sync initialization time (TINIT) From VI > ~2.7 V to ready to be enabled output voltage total on delay time (TONdel_tot) enabled by input voltage enabled by CTRL pin output voltage on delay time (TONdel) turn on delay duration range PMBus configurable TON_DELAY accuracy (actual delay vs set value) 3 output voltage off delay time3 (TOFFdel) turn off delay duration range PMBus configurable TOFF_DELAY accuracy (actual delay vs set value) 4 ns -10 10 67 ms 5 -0/+2 0 -0/+2 250 ms ms ms 250 ms ms ms turn on ramp duration 5 turn off ramp duration Disabled in standard configuration. Turn off immediately upon expiration of turn off delay. ramp duration range PMBus configurable TON_RISE/TOFF_FALL power good threshold (PG) rising falling power good threshold range (PG) PMBus configurable POWER_GOOD_ON VOUT_UV_FAULT_LIMIT % TINIT + TONdel TONdel 0 ramp time accuracy for standalone operation (actual ramp time vs set value) Notes: units VO = 0.6 V VO = 1.0 V VO = 1.8 V power dissipation at max IO (d) output voltage on/off ramp up time (0→100%,100→0% of VO) (TONrise/TOFFfall) max 12 50% of max IO efficiency (η) switching frequency range2 (fSW = 1/TSW) typ 0 ms 100 250 μs 90 85 %VO %VO 100 1. Value refers to total (internal + external) effective output capacitance. Capacitance derating with VO typical for ceramic capacitors (bias characteristics) and temperature variations must be considered for the external capacitor(s). See section External Output Capacitors. 2. There are configuration changes to consider when changing the switching frequency, see section Switching Frequency. 3. The specified accuracy applies for off delay times larger than 4 ms. A value of 0 ms can be set to guarantee a fast shut-off, but this will force the device to Immediate Off behavior, even if soft-off, i.e. ramp-down, is configured. When setting 0 ms the actual delay will be 0 ms. cui.com ms %VO For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 6 of 33 PRODUCT ELECTRICAL SPECIFICATION (CONTINUED) parameter conditions/description power good delay (PG) From VO reaching target to PG assertion min power good delay range (PG) PMBus configurable POWER_GOOD_DELAY typ 0 input under voltage protection threshold (IUVP) max 2 units ms 5000 ms 6.4 V 6.4~14 V 0.5 V 0~7.6 V input under voltage protection set point accuracy (IUVP) 280 mV input under voltage protection response delay (IUVP) 100 μs 280 ms 16 V 6.9~16 V 1 V 0~9.1 V input over voltage protection set point accuracy (IOVP) 280 mV input over voltage protection response delay (IOVP) 100 μs 280 ms 85 %VO 0~100 %VO 115 %VO 100~115 %VO 10 μs 280 ms input under voltage protection threshold range (IUVP) PMBus configurable VIN_UV_FAULT_LIMIT input under voltage protection hysteresis (IUVP) input under voltage protection hysteresis range (IUVP) input under voltage protection fault response1 (IUVP) PMBus configurable VIN_UV_WARN_LIMIT shutdown, automatic restart VIN_UV_FAULT_RESPONSE input over voltage protection threshold (IOVP) input over voltage protection threshold range (IOVP) PMBus configurable VIN_OV_FAULT_LIMIT input over voltage protection hysteresis (IOVP) input over voltage protection hysteresis range (IOVP) input over voltage protection fault response1 (IOVP) PMBus configurable VIN_OV_WARN_LIMIT shutdown, automatic restart VIN_OV_FAULT_RESPONSE output under voltage protection threshold (UVP) output under voltage protection threshold range (UVP) PMBus configurable VOUT_UV_FAULT_LIMIT output over voltage protection threshold (OVP) output over voltage protection threshold range (OVP) PMBus configurable VOUT_OV_FAULT_LIMIT output over/under voltage protection response time (UVP/OVP) output over/under voltage protection fault response1 (UVP/OVP) Notes: shutdown, automatic restart VOUT_UV_FAULT_RESPONSE VOUT_OV_FAULT_RESPONSE 1. Automatic restart ~280 ms after fault if the fault is no longer present. Continuous restart attempts if the fault reappear after restart. See Operating Information for other fault response options. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 7 of 33 PRODUCT ELECTRICAL SPECIFICATION (CONTINUED) parameter conditions/description over current protection threshold1 (OCP) min set value per phase over current protection threshold range1 (OCP) PMBus configurable IOUT_AVG_OC_FAULT_LIMIT over current protection protection delay1 (OCP) typ max units 57 A 0~57 A 5 TSW over current protection fault response1 (OCP) shutdown, automatic restart2 MFR_IOUT_OC_FAULT_RESPONSE 280 ms over temperature protection threshold3 (OTP) position P3 125 °C over temperature protection threshold range3 (OTP) position P3 PMBus configurable OT_FAULT_LIMIT -40~125 °C over temperature protection hysteresis3 (OTP) position P3 PMBus configurable 15 °C over temperature protection fault response3 (OTP) position P3 shutdown, automatic restart2 OT_FAULT_RESPONSE 280 ms over temperature protection threshold3 (OTP) position P1 150 °C over temperature protection threshold range3 (OTP) position P1 PMBus configurable MFR_VMON_OV_FAULT_LIMIT -40~150 °C over temperature protection hysteresis3 (OTP) position P1 PMBus configurable 25 °C over temperature protection fault response3 (OTP) position P1 shutdown, automatic restart2 VMON_OV_FAULT_RESPONSE 280 ms input voltage READ_VIN 280 mV 1 %VO 1 3.5 A A output voltage READ_VOUT monitoring accuracy output current READ_IOUT duty cycle READ_DUTY_CYCLE temperature READ_TEMPERATURE_1 TP1 = 25 °C, VO = 1.0 V TP1 = 0-95 °C, VO = 1.0 V No tolerance, value is that applied to PWM controller position P3 tracking input bias current4 VTRK = 5 V tracking input voltage range VTRK pin tracking accuracy regulation 100% tracking ramp accuracy, VO = 1.0 V, 5 ms ramp current difference between products in a current sharing group steady state operation 70 5 % 200 μA 0~1.8 -2 V 2 mV Max 2 x READ_IOUT monitoring accuracy number of products in a current sharing group Notes: -10 4 1. The set OCP limit applies per phase. The total OCP limit will be twice the set value. 2. Automatic restart ~280 ms after fault if the fault is no longer present. Continuous restart attempts if the fault reappear after restart. See Operating Information for other fault response options. 3. See section Over Temperature Protection (OTP). 4. The maximum tracking rise-time is 1 V/ms, see section Voltage Tracking. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 8 of 33 PRODUCT ELECTRICAL SPECIFICATION (CONTINUED) parameter conditions/description logical output low signal level (VOL) SCL, SDA, SYNC, DDC, SLRT, PG sink/source current = 2 mA min logical output high signal level (VOH) SCL, SDA, SYNC, DDC, SLRT, PG sink/source current = 2 mA logic output low sink current (IOL) typ SCL, SDA, CTRL, SYNC, DDC logic input high threshold (VIH) SCL, SDA, CTRL, SYNC, DDC logic leakage current (II_LEAK) SCL, SDA, SYNC, SLRT, PG logic pin input capacitance (CI_PIN) SCL, SDA, CTRL, SYNC, DDC logic pin internal pull-up resistance (RI_PU) SCL, SDA, SLRT CTRL to +5V DDC to +5V 0.5 V V -2 mA 2 mA 0.8 V 2 V -100 SMBus operating frequency (fSMB) SMBus bus free time1 (TBUF) units 2.25 logic output high source current (IOH) logic input low threshold (VIL) max 100 μA 12 pF no internal pull-up 10 47 kΩ kΩ 400 kHz 1.3 μs SMBus SDA setup time from SCL1 (tset) 100 ns SMBus SDA hold time from SCL1 (thold) 300 ns SMBus START/STOP condition setup/hold time from SCL 600 ns SCL low period (Tlow) 1.3 μs SCL high period (Thigh) 0.6 μs Notes: STOP bit to START bit 100 1. See SMBus - Timing section. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 9 of 33 TYPICAL OUTPUT CHARACTERISTICS, VO = 0.6 V Conditions (Standard configuration unless otherwise stated): TP1 = 25°C Power Dissipation Efficiency Efficiency (%) 95 Vin 90 7.5 V 85 9.6 V 80 12 V 75 14 V 70 0 10 20 30 40 50 60 70 80 15 Module Power Dissipaon (W) 100 12 Vin 9 7.5 V 9.6 V 6 12 V 3 14 V 0 0 90 10 20 30 40 50 60 70 80 90 Load Current (A) Load Current (A) Output Current Derating for Vertical Version Output Current Derating for Lay Down Version 90 80 90 70 Airflow 70 60 Load Current (A) Load Current (A) 80 3.0 m/s 50 40 2.0 m/s 30 1.0 m/s 20 0.5 m/s 10 30 40 50 60 70 80 90 2.0 m/s 40 1.0 m/s 30 0.5 m/s Nat. Conv. 10 100 110 120 0 30 Ambient Air Temperature (°C) 40 50 60 70 80 90 100 110 120 Ambient Air Temperature (°C) Output Ripple and Noise Vin = 12 V, Iout = Imax 3.0 m/s 50 20 Nat. Conv. 0 60 Transient Response Vin = 12 V, Iout = 25% Imax cui.com 75% Imax 25% Imax For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 10 of 33 TYPICAL OUTPUT CHARACTERISTICS, VO = 1.0 V Conditions (Standard configuration unless otherwise stated): TP1 = 25°C Efficiency Power Dissipation Efficiency (%) 95 Vin 90 7.5 V 85 9.6 V 80 12 V 75 14 V 70 0 10 20 30 40 50 60 70 80 15 Module Power Dissipaon (W) 100 12 Vin 9 7.5 V 9.6 V 6 12 V 3 14 V 0 0 90 10 20 30 40 50 60 70 80 90 Load Current (A) Load Current (A) Output Current Derating for Vertical Version Output Current Derating for Lay Down Version 90 80 90 70 Airflow 70 60 60 Load Current (A) Load Current (A) 80 3.0 m/s 50 40 2.0 m/s 30 1.0 m/s 20 0.5 m/s 10 30 40 50 60 70 80 90 1.0 m/s 30 0.5 m/s Nat. Conv. 10 100 110 120 0 30 Ambient Air Temperature (°C) 40 50 60 70 80 90 100 110 120 Ambient Air Temperature (°C) Output Ripple and Noise Vin = 12 V, Iout = Imax 2.0 m/s 40 20 Nat. Conv. 0 3.0 m/s 50 Transient Response Vin = 12 V, Iout = 25% Imax cui.com 75% Imax 25% Imax For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 11 of 33 TYPICAL OUTPUT CHARACTERISTICS, VO = 1.8 V Conditions (Standard configuration unless otherwise stated): TP1 = 25°C Power Dissipation Efficiency Efficiency (%) 95 Vin 90 7.5 V 85 9.6 V 80 12 V 75 14 V 70 0 10 20 30 40 50 60 70 80 15 Module Power Dissipaon (W) 100 12 Vin 9 7.5 V 9.6 V 6 12 V 3 14 V 0 0 90 10 20 30 40 50 60 70 80 90 Load Current (A) Load Current (A) Output Current Derating for Lay Down Version Output Current Derating for Vertical Version 90 80 90 70 Airflow 70 60 60 Load Current (A) Load Current (A) 80 3.0 m/s 50 40 2.0 m/s 30 1.0 m/s 20 0.5 m/s 10 30 40 50 60 70 80 90 1.0 m/s 30 0.5 m/s Nat. Conv. 10 100 110 120 0 30 Ambient Air Temperature (°C) 40 50 60 70 80 90 100 110 120 Ambient Air Temperature (°C) Transient Response Output Ripple and Noise Vin = 12 V, Iout = Imax 2.0 m/s 40 20 Nat. Conv. 0 3.0 m/s 50 Vin = 12 V, Iout = 25% Imax cui.com 75% Imax 25% Imax For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 12 of 33 TYPICAL ON/OFF CHARACTERISTICS Conditions (Standard configuration unless otherwise stated): TP1 = 25°C, VO = 1.0 V Enable by input voltage Disable by input voltage Enable by CTRL pin Disable by CTRL pin cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 13 of 33 TYPICAL CHARACTERISTICS Conditions (Standard configuration unless otherwise stated): TP1 = 25°C Power Dissipation vs. Output Current and Switching Frequency Efficiency vs. Output Current and Switching Frequency 95 14.0 93 12.0 Efficiency (%) 89 87 200 kHz 85 320 kHz 83 480 kHz 81 640 kHz Power Dissipated (W) 91 10.0 640 kHz 8.0 480 kHz 6.0 320 kHz 200 kHz 4.0 79 2.0 77 75 0.0 0 10 20 30 40 50 60 70 80 90 0 10 20 30 40 Load Current (A) 60 70 80 90 Load Transient vs. ASCR Gain and External Output Capacitance Output Ripple vs. Switching Frequency 8.0 100.0 90.0 7.0 80.0 6.0 70.0 5.0 1.8 V 4.0 1.0 V 3.0 0.6 V Vout Transient(mV) Vout Ripple (mV p-p) 50 Load Current (A) 2.0 60.0 50.0 4 x 470 μF + 10 x 100 μF 40.0 10 x 470 μF + 10 x 100 μF 30.0 20.0 1.0 10.0 0.0 0.0 200 250 300 350 400 450 500 550 150 600 200 250 300 350 ASCR Fsw (kHz) cui.com 400 450 500 For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 14 of 33 MECHANICAL DRAWING (HORIZONTAL, THROUGH-HOLE MOUNT) units: mm [inches] tolerance unless specified: X.X ±0.50 [0.02] X.XX ±0.25 [0.01] (not applied on footprint or typical values) D 19.05 0.75 50.80 2.00 Top View Side View 9.67 0.381 1.02 0.040 (14 PLCS) 0.50 0.020 (14 PLCS) Front View 51.80 2.039 Recommended keep out area for user components 2.40 0.094 2.40 0.094 2.25 0.089 12 11 2.25 0.089 0.80 0.031 (14 PLCS) 20.05 0.789 4.20 0.165 2.40 0.094 4B 1A 1B 2A 2B 3A 3B 3C 3D 2C 2D 1C 2.25 0.089 1.20 0.047 (14 PLCS) 4A 2.80 0.110 (11 PLCS) 5B 6B 7B 8B 9B 1D Recommended Footprint Top View 5A 6A 7A 10B 8A 9A 10A 2.00 0.079 (6 PLCS) cui.com 2.00 0.079 PIN NUMBER PIN NAME 1A, 1B, 1C, 1D VIN 2A, 2B, 2C, 2D GND 3A, 3B, 3C, 3D VOUT 4A +S 4B -S 5A VSET 5B VTRK 6A SLRT 6B SDA 7A SCL 7B FAULT 8A SA 8B SYNC 9A PG 9B CTRL 10A DDC 10B PREF 11 N/C 12 N/C MATERIAL PLATING Copper Alloy Min 0.1 μm Au over 1~3 μm Ni For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 15 of 33 MECHANICAL DRAWING (VERTICAL) units: mm [inches] tolerance unless specified: X.X ±0.50 [0.02] X.XX ±0.25 [0.01] (not applied on footprint or typical values) H 19.05 0.75 0.50 0.02 1.00 0.039 50.80 2.00 Front View Side View 9.47 0.373 Bottom View 5.07 0.200 0.80 0.031 (14 PLCS) 1.20 0.047 (12 PLCS) 4.20 0.165 1A 1B 2A 2B 3A 3B 3C 3D 2C 2D 1C 1D 4A 5A 6A 7A 8A 9A 10A 6B 7B 8B 9B 10B 10.5 0.413 2.00 0.079 2.80 0.110 (11 PLCS) 2.00 0.079 (6 PLCS) 4B 5B 51.80 2.04 Recommended Footprint Top View Recommended keep out area for user components cui.com PIN NUMBER PIN NAME 1A, 1B, 1C, 1D VIN 2A, 2B, 2C, 2D GND 3A, 3B, 3C, 3D VOUT 4A +S 4B -S 5A VSET 5B VTRK 6A SLRT 6B SDA 7A SCL 7B FAULT 8A SA 8B SYNC 9A PG 9B CTRL 10A DDC 10B PREF MATERIAL PLATING Copper Alloy Min 0.1 μm Au over 1~3 μm Ni For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER Conducted EMI is measured according to the test set-up below. The typical fundamental switching frequency is 320 kHz. Output Ripple and Noise The circuit shown below is used to measure output r ipple and noise. A damped filter is created by the 50 mm conductor and the two capacitors. 50 mm conductor Vout Conducted EMI Input terminal value (typical for standard configuration). VI = 12 V, VO = 1.0 V, IO = IMAX +S Tantalum Capacitor Capa 10 µF co Ceramic Capacitor 0.1 µF −S GND Load EMC SPECIFICATION date 09/03/2015 │ page 16 of 33 50 mm conductor BNC-contact to oscilloscope Output ripple and noise test set-up. The following is an example of the low frequency output ripple and noise as measured with the above circuit. EMI without filter. To spectrum analyzer RF Current probe 1kHz – 50MHz Battery supply Resistive load DUT C1 VI=12 V, VO=1.0 V, IO=90 A, COUT = 10 x 470 μF/5 mΩ + 10 x 100 μF, 5 mV/div, 50 µs/div Example of low frequency ripple at the output. 50mm C1 = 10uF / 600VDC Feed- Thru RF capacitor 800mm 200mm Test set-up conducted emission, power lead. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER PMBUS INTERFACE Power Conversion Overview The NDM3Z-90 module has several features to enable high power conversion efficiency. Adaptive algorithms and cycle-by-cycle charge management improves the response time and reduces the output deviation as a result of load transients. The incorporation of DFM enhances the CUI modules for improved performance. Power Management Overview This product incorporates a wide range of configurable power management features that are simple to implement with a minimum of external components. Additionally, the product includes protection features that continuously safeguard the load from damage due to unexpected system faults. The product’s standard configuration is suitable for a wide range of operation in terms of input voltage, output voltage, and load. The configuration is stored in an internal Non-Volatile Memory (NVM). All power management functions can be reconfigured using the PMBus interface. Throughout this document, different PMBus commands are referenced. A detailed description of each command is provided in the appendix at the end of this specification. The ability of CUI modules to digitally control, configure and monitor OS features provides significant benefits during development, production and the product life. SMBus Interface The product can be used with any standard two-wire I2C or SMBus host device. See Electrical Specification for a llowed clock frequency range. In addition, the product is compatible with PMBus version 1.2 and includes an SLRT line to help mitigate limitations related to continuous fault monitoring. The PMBus signals SCL, SDA and SLRT require passive pull-up resistors as stated in the SMBus Specification. Pull-up resistors are required to guarantee the rise time as follows: T = RPCP ≤ 1μs Where RP is the pull-up resistor value and CP is the bus loading. The maximum allowed bus load is 400 pF. The pull-up resistor should be tied to an external supply v oltage in range from 2.5 to 5.5 V, which should be present prior to or during power-up. If the proper power supply is not available, voltage dividers may be applied. Note that in this case, the resistance in the equation above corresponds to parallel connection of the resistors forming the voltage divider. date 09/03/2015 │ page 17 of 33 PMBus Addressing The PMBus address is configured with a resistor connected between the SA pin and the PREF pin, as shown in the Typical Application Circuit. Recommended resistor values are shown in the table below. 1% tolerance resistors are required. RSA (kΩ) Address RSA (kΩ) Address 0 (short) 0x26 42.2 0x28 10 0x19 46.4 0x29 11 0x1A 51.1 0x2A 12.1 0x1B 56.2 0x2B 13.3 0x1C 61.9 0x2C 14.7 0x1D 68.1 0x2D 16.2 0x1E 75 0x2E 17.8 0x1F 82.5 0x2F 19.6 0x20 90.9 0x30 21.5 0x21 100 0x31 23.7 0x22 110 0x32 26.1 0x23 121 0x33 28.7 0x24 133 0x34 31.6 0x25 147 0x35 34.8 0x26 162 0x36 38.3 0x27 178 0x37 infinite (open) 0x28 Reserved Addresses Addresses listed in the table below are reserved or assigned according to the SMBus specification and may not be usable. Refer to the SMBus specification for further information. Address Comment 0x00 general call address / START byte 0x01 CBUS address 0x02 address reserved for different bus format 0x03 ~ 0x07 reserved for future use 0x08 SMBus host 0x09 ~0x0B assigned for smart battery 0x0C SMBus alert response address 0x28 reserved for ACCESS.bus host 0x2C ~ 0x2D reserved for previous versions of the SMBus specification 0x37 reserved for ACCESS.bus default address 0x40 ~ 0x44 reserved by previous versions of the SMBus specification 0x48 ~ 0x4B unrestricted addresses 0x61 SMBus device default address 0x78 ~ 0x7B 10-bit slave addressing 0x7C ~ 0x7F reserved for future use cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER Monitoring via PMBus It is possible to continuously monitor a wide variety of parameters through the PMBus interface. These include, but are not limited to, the parameters listed in the table below. Parameter PMBus Command input voltage READ_VIN output voltage READ_VOUT total output current READ_IOUT output current of each phase READ_IOUT0 READ_IOUT1 controller temperature READ_TEMPERATURE_1 switching frequency READ_FREQUENCY duty cycle READ_DUTY_CYCLE highest temperature of power switches* READ_VMON ● ● ● ● ● date 09/03/2015 │ page 18 of 33 Output current Controller temperature Switching frequency Duty cycle Status and fault information When a fault occurs the Snapshot functionality will automatically store this parametric data to NVM. The data can then later be read back to provide valueable information for analysis. It is possible to select which faults will trigger a store to NVM by the PMBus command SNAPSHOT_FAULT_MASK. PMBus/I2C Timing * Reports a voltage level corresponding to the temperature. See command details in the end of this specification. Monitoring Faults Fault conditions can be monitored using the SLRT pin, which will be asserted low when any number of pre-configured fault or warning conditions occur. The SLRT pin will be held low until faults and/or warnings are cleared by the CLEAR_FAULTS command, or until the output v oltage has been re-enabled. It is possible to mask which fault conditions should not assert the SLRT pin by the command MFR_SMBALERT_MASK. In response to the SLRT signal, the user may read a number of status commands to find out what fault or w arning condition occurred, see table below. Fault & Warning Status PMBus Command overview, power good STATUS_WORD STATUS_BYTE output voltage level STATUS_VOUT output current level STATUS_IOUT input voltage level STATUS_INPUT temperature level STATUS_TEMPERATURE PMBus communication STATUS_CML miscellaneous STATUS_MFR_SPECIFIC The setup time, tset, is the time data, SDA, must be stable before the rising edge of the clock signal, SCL. The hold time thold, is the time data, SDA, must be stable after the falling edge of the clock signal, SCL. If these times are violated incorrect data may be captured or m eta-stability may occur and the bus communication may fail. All standard SMBus protocols must be followed, including clock stretching. Refer to the SMBus specification for SMBus electrical and timing requirements. This product supports the BUSY flag in the status commands to indicate product being too busy for SMBus r esponse. A busfree time delay according to this specification must occur between every SMBus transmission (between every stop & start condition). The product s upports PEC (Packet Error Checking) according to the SMBus specification. Snapshot Parameter Capture This product offers a special feature that enables the user to capture parametric data during normal operation by a single PMBus command SNAPSHOT. The following parameters are stored: ● ● Setup and hold times timing diagram. When sending subsequent commands to the same unit it is recommended to insert additional delays after write transactions according to the table below. After read transactions a delay of 2 ms should be inserted before accessing the unit again. Input voltage Output voltage cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER PMBus Command Delay after write before additional command STORE_USER_ALL 100 ms STORE_DEFAULT_ALL 100 ms RESTORE_USER_ALL 100 ms RESTORE_DEFAULT_ALL 100 ms any other command 10 ms Initialization Procedure The product follows an internal initialization procedure after power is applied to the VIN pin: 1. Self test and memory check. 2. The address pin-strap resistors are measured and the associated PMBus address is defined. Non-Volatile Memory (NVM) The product incorporates two Non-Volatile Memory areas for storage of the PMBus command values; the Default NVM and the User NVM. The Default NVM is pre-loaded with CUI factory default values. The Default NVM is write-protected and can be used to restore the CUI factory default values through the command RESTORE_DEFAULT_ALL. The User NVM is pre-loaded with CUI factory default values. The User NVM is writable and open for customization. The values in NVM are loaded during initialization according to s ection Initialization Procedure, whereafter commands can be changed through the PMBus Interface. The STORE_USER_ ALL command will store the changed parameters to the User NVM. Pin-strap resistors INITIALIZATION Default NVM INITIALIZATION CUI factory default Write-protected User NVM CUI factory default Customizable 3. The output voltage pin-strap resistor is measured and the associated output voltage level will be loaded to operational RAM of PMBus command VOUT_COMMAND. 4. CUI factory default values stored in default NVM memory are loaded to operational RAM. This overwrites any previously loaded values. 5. Values stored in the User NVM are loaded into operational RAM memory. This overwrites any previously loaded values (e.g. VOUT_COMMAND by pin-strap). 6. Check for external clock signal at the SYNC pin and lock internal clock to the external clock if used. Once this procedure is completed and the Initialization Time has passed (see Electrical Specification), the output v oltage is ready to be enabled using the CTRL pin. The product is also ready to accept commands via the PMBus interface, which in case of writes will overwrite any values loaded during the initialization procedure. RESTORE_DEFAULT_ALL RAM VIN INITIALIZATION STORE_USER_ALL TINIT RESTORE_USER_ALL WRITE PMBus interface date 09/03/2015 │ page 19 of 33 VOUT READ Illustration Initialization time. Illustration of memory areas of the product. Command Protection The user may write-protect specific PMBus commands in the User NVM by using the command UNPROTECT. cui.com Ready for output enable and soft-start For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 20 of 33 OPERATING INFORMATION Input Voltage The input voltage range 7.5-14V makes the product easy to use in intermediate bus applications when powered by a non-regulated bus converter or a regulated bus converter. External Input Capacitors The product is a two-phase converter which gives lower input ripple than a single phase design. Thus, ripple-current-rating requirements for the input capacitors are lower. Input Under Voltage Protection (IUVP) The product monitors the input voltage and will turn-on and turn-off at configured thresholds (see Electrical Specification). The turn-on input voltage threshold is set higher than the corresponding turn-off threshold. Hence, there is a hysteresis between turn-on and turn-off input voltage levels. Once the input voltage falls below the turn-off threshold, the device can respond in several ways as follows: For most applications non-tantalum capacitors are preferred due to the robustness of such capacitors to a ccommodate high inrush currents of systems being powered from very low impedance sources. It is recommended to use a combination of ceramic capacitors and low-ESR electrolytic/ polymer bulk capacitors. The low ESR of ceramic capacitors effectively limits the input ripple voltage level, while the bulk capacitance minimizes deviations in the input voltage at large load transients. 1. Immediate and definite shutdown of output voltage until the fault is cleared by PMBus command CLEAR_FAULTS or the output voltage is re-enabled. 2. Immediate shutdown of output voltage while the input voltage is below the turn-on threshold. Operation resumes automatically and the output is enabled when the input voltage has risen above the turn-on threshold. The default response is option 2. The IUVP function can be reconfigured using the PMBus commands VIN_UV_FAULT_LIMIT (turn-off threshold), VIN_UV_WARN_LIMIT (turn-on threshold) and VIN_UV_FAULT_RESPONSE. Input Over Voltage Protection (IOVP) The product monitors the input voltage continously and will respond as configured when the input voltage rises above the configured threshold level (see Electrical S pecification). Refer to section “Input Under Voltage Protection” for functionality, response configuration options and default setting. The IOVP function can be reconfigured u sing the PMBus commands VIN_OV_FAULT_LIMIT (turn-off threshold), VIN_OV_WARN_LIMIT (turn-on threshold) and VIN_OV_FAULT_RESPONSE. Input and Output Impedence The impedance of both the input source and the load will interact with the impedance of the product. It is important that the input source has low characteristic impedance. If the input voltage source contains significant inductance, the addition of a capacitor with low ESR at the input of the product will ensure stable operation. If several products are connected in a phase spreading setup the amount of input ripple current, and capacitance per product, can be reduced. Input capacitors must be placed closely and with low impedance connections to the VIN and GND pins in order to be effective. External Output Capacitors The output capacitor requirement depends on two considerations; output ripple voltage and load t ransient response. To achieve low ripple voltage, the output capacitor bank must have a low ESR value, which is achieved with ceramic output capacitors. A low ESR value is critical also for a small output voltage deviation during load transients. Designs with smaller load transients can use fewer capacitors and designs with more dynamic load content will require more load capacitors to achieve a small output deviation. Improved transient response can also be achieved by adjusting the settings of the control loop of the product. Adding output capacitance decreases loop band-width. It is recommended to locate low ESR ceramic and low ESR electrolytic/polymer capacitors as close to the load as possible, using several capacitors in parallel to lower the effective ESR. It is important to use low resistance and low inductance PCB layouts and cabling in order for capacitance to be effective. Dynamic Loop Compensation (DLC) The typical design of regulated power converters includes a control function with a feedback loop that can be closed using either analog or digital circuits. The feedback loop cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER is required to provide a stable output voltage, but should be optimized for the output filter to maintain output v oltage regulation during transient conditions such as sudden changes in output current and/or input voltage. Digitally controlled converters allow one to optimize loop p arameters without the need to change components on the board, however, optimization can still be challenging because the key parameters of the output filter include parasitic impedances in the PCB and the often distributed filter components themselves. Details of the algorithm that is used to characterize an output filter and the different operational modes can be found in the following sections. 100.0 90.0 80.0 70.0 Vout Transient(mV) Dynamic Loop Compensation has been developed to solve the problem of compensation for a converter with a difficult to define output filter. This task is achieved by utilization of algorithms that can identify an arbitrary output filter based on accurate measurements of the output voltage in response to a very small excitation signal initiated by the algorithm, or occurring due to the changes in o perating conditions, and automatically adjust feedback loop parameters to match the output filter. date 09/03/2015 │ page 21 of 33 60.0 50.0 4 x 470 μF + 10 x 100 μF 40.0 10 x 470 μF + 10 x 100 μF 30.0 20.0 10.0 0.0 150 200 250 300 350 400 450 500 ASCR VI =12 V, VO =1 V, load step 25%-75%-25% , 2A/μs, fsw=320 kHz, Residual factor=90 Voltage deviation vs. control loop gain setting and output capacitance The user may also adjust the residual factor, set by the ASCR_CONFIG command, to improve the recovery time after a load transient. Control Loop The products use a fully digital control loop that achieves precise control of the entire power conversion process, resulting in a very flexible device that is also very easy to use. A non-linear charge-mode control algorithm is implemented that responds to output current changes within a single PWM switching cycle, achieving a smaller total output voltage variation with less output capacitance than traditional PWM controllers, thus saving cost and board space. The algorithm is inherently stable at all conditions due to a residual scheme. Control may be set more or less aggressive by adjusting a gain factor, set by the PMBus command ASCR_CONFIG. Increasing the gain, i.e the control effort, will reduce the voltage deviation at load transients, at the expense of somewhat increased ripple on the output. Below graph exemplifies the impact on load transient performance when adjusting the gain factor. 130 Recovery Time ( μs) 110 90 10 x 470 μF + 10 x 100 μF 70 4 x 470 μF + 10 x 100 μF 50 30 50 60 70 80 90 100 110 Residual VI =12 V, VO =1 V, load step 25%-75%-25% , 2A/μs, fsw=320 kHz, gain factor=300 Recovery time vs. control loop residual setting and output capacitance. By default the product is configured with a moderate gain setting to provide a trade-off between load transient performance and output ripple for a wide range of operating conditions. For a specific application the gain factor can be increased with an improved load transient response. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER Remote Sense The product has remote sense to compensate the voltage drops between the output and the point of load. The sense traces should be located close to each other and to the PCB ground layer to reduce noise susceptibility. Output Voltage Adjust using Pin-Strap Resistor Using an external Pin-strap resistor, RSET, the output voltage can be set to several predefined levels shown in the table below. The resistor should be applied between the VSET pin and the PREF pin as shown in the Typical Application Circuit. Maximum 1% tolerance resistors are required. In cases where the external output filter includes an inductor (forming a pi filter) according to the picture below, the LEXT/CEXT resonant frequency places an upper limit on the controller loop bandwidth. If the resonant frequency is high the sense lines can be connected after the filter (as shown in the picture) – if the resonant frequency is low and the DC drop from LEXT is acceptable, sensing before the filter may be better. CO LEXT CEXT RSET (kΩ) Load Vout GND -S +S date 09/03/2015 │ page 22 of 33 Vout [V] RSET (kΩ) Vout [V] 0 (short) 1.00 26.1 1.10 10 0.60 28.7 1.15 11 0.65 31.6 1.20 12.1 0.70 34.8 1.25 13.3 0.75 38.3 1.30 14.7 0.80 42.2 1.40 16.2 0.85 46.4 1.50 17.8 0.90 51.1 1.60 19.6 0.95 56.2 1.70 21.5 1.00 61.9 1.80 23.7 1.05 infinite (open) 1.20 RSET also sets the maximum output voltage; see section Output Voltage Range Limitation. The resistor is sensed only during the initialization procedure after application of input voltage. Changing the resistor value during normal operation will not change the output voltage. External output filter with inductor (pi filter). Output Voltage Control To control the output voltage the following options are available: 1. Output voltage is controlled through the CTRL pin. 2. Output voltage is controlled using the PMBus command OPERATION. The CTRL pin has an internal 10 kΩ pull-up resistor to 5 V. The external device must provide a minimum required sink current to guarantee a voltage not higher than the logic low threshold level (see Electrical Characteristics). When the CTRL pin is left open, the voltage generated on the CTRL pin is 5 V. If the device is to be synchronized to an external clock source, the clock frequency must be stable prior to enabling the output voltage. Output Voltage Adjust using PMBus The output voltage set by pin-strap can be overridden up to a certain level (see section Output Voltage Range Limitation) by using the PMBus command VOUT_COMMAND. See Electrical Specification for adjustment range. Voltage Margining Up/Down Using the PMBus interface it is possible to adjust the output voltage to one of two predefined levels above or below the nominal voltage setting in order to determine whether the load device is capable of operating over its specified supply voltage range. This provides a convenient method for d ynamically testing the operation of the load circuit over its supply margin or range. It can also be used to verify the function of supply voltage supervisors. Margin limits of the nominal output voltage ±5% are default, but the margin limits can be reconfigured using the PMBus commands VOUT_MARGIN_LOW and VOUT_MARGIN_HIGH. Margining is activated by the command OPERATION and can be used regardless of the output voltage being enabled by the CTRL pin or by the PMBus. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER Output Voltage Trim The actual output voltage can be trimmed to optimize performance of a specific load by setting a non-zero value for PMBus command VOUT_TRIM. The value of VOUT_TRIM is summed with the nominal output voltage set by VOUT_COMMAND, allowing for multiple products to be commanded to a common nominal value, but with slight adjustments per load. Output Voltage Range Limitation The output voltage range that is possible to set by configuration or by the PMBus interface is hardware limited by the pin-strap resistor RSET. The maximum output v oltage is set to 115% of the output value defined by RSET. This protects the application circuit from an over voltage due to an accidental PMBus command. The limitation applies to the actual regulated output voltage rather than to the configured value. Thus, it is possible to write and read back a VOUT_COMMAND value higher than the limit, but the actual output voltage will be limited. The output voltage limit can be reconfigured to a lower value by writing the PMBus command VOUT_MAX. Output Over Voltage Protection (OVP) The product includes over voltage limiting circuitry for protection of the load. The default OVP limit is 15% above the nominal output voltage. The product can be configured to respond in different ways to the output voltage exceeding the OVP limit: 1. Immediate and definite shutdown of output voltage until the fault is cleared by PMBus command CLEAR_FAULTS or the output voltage is re-enabled. 2. Immediate shutdown of output voltage followed by continous restart attempts of the output voltage with a preset interval (“hiccup” mode). The default response is option 2. The OVP limit and fault response can be reconfigured using the PMBus commands VOUT_OV_FAULT_LIMIT, VOUT_OV_FAULT_RESPONSE and OVUV_CONFIG. Output Under Voltage Protection (UVP) The product includes output under voltage limiting circuitry for protection of the load. The default UVP limit is 15% below the nominal output voltage. Refer to section Output Over Voltage Protection for response configuration options and default setting. The UVP limit and fault response can be reconfigured using the PMBus commands VOUT_UV_FAULT_LIMIT and VOUT_UV_FAULT_RESPONSE. date 09/03/2015 │ page 23 of 33 Power Good The power good pin (PG) indicates when the product is ready to provide regulated output voltage to the load. During ramp-up and during a fault condition, PG is held low. By default, PG is asserted high after the output has ramped to a voltage above 90% of the nominal voltage, and d easserted if the output voltage falls below 85% of the nominal voltage. These thresholds may be changed using the PMBus commands POWER_GOOD_ON and VOUT_UV_FAULT_LIMIT. The time between when the POWER_GOOD_ON threshold is reached and when the PG pin is actually asserted is set by the PMBus command POWER_GOOD_DELAY. See Electrical Specification for default value and range. By default the PG pin is configured as an open drain output but it is also possible to set the output in push-pull mode by the command USER_CONFIG. The PG output is not defined during ramp up of the input voltage due to the initialization of the product. Over Current Protection (OCP) The product includes robust current limiting circuitry for protection at continuous overload. After ramp-up is complete the product can detect an output overload/short condition. The following OCP response options are available: 1. Immediate and definite shutdown of output voltage until the fault is cleared by PMBus command CLEAR_FAULTS or the output voltage is re-enabled. 2. Immediate shutdown of output voltage followed by continous restart attempts of the output voltage with a preset interval (“hiccup” mode). The default response from an over current fault is option 2. Note that delayed shutdown is not supported. The load distribution should be designed for the maximum output short circuit current specified. The OCP limit and response can be reconfigured using the PMBus commands IOUT_AVG_OC_FAULT_LIMIT and MFR_IOUT_OC_FAULT_RESPONSE. Under Current Protection (UCP) The product includes robust current limiting circuitry for protection at continuous reversed current, due to a synchronous rectifier ability to sink current. Refer to section Over Current Protection for response configuration options and default setting. The UCP limit and response can be reconfigured using the PMBus commands IOUT_AVG_UC_FAULT_LIMIT and MFR_IOUT_UC_FAULT_RESPONSE. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER Switching Frequency The default switching frequency is chosen as the best tradeoff between efficiency and thermal performance, output ripple and load transient performance. The switching frequency can be reconfigured in a certain range using the PMBus command FREQUENCY_SWITCH. Refer to Electrical Specification for default switching frequency and range. Changing the switching frequency will affect efficiency and power dissipation, load transient response (control loop characteristics) and output ripple. Note that since the product has two phases the effective switching frequency will be twice the configured value. date 09/03/2015 │ page 24 of 33 SYNC clock Phase offset = 60° PWM pulse (VO/VI = 0.165) Illustration of phase offset. The phase offset is configured using the PMBus command INTERLEAVE and is defined as: Synchronization Two or more products may be synchronized with an external clock to eliminate beat frequencies reflected back to the input supply rail. Eliminating the slow beat frequencies (usually <10 kHz) eases the filtering requirements. Synchronization can also be utilized for phase spreading, described in section Phase Spreading. The products can be synchronized with an external o scillator or one product can be configured with the SYNC pin as a SYNC output, working as a source of synchronization signal for other products connected to the same synchronization line. The SYNC pin of products being synchronized must be configured as SYNC Input. Default configuration is using the internal clock, independently of signal at the SYNC pin. Synchronization is configured using PMBus command MFR_USER_CONFIG. Phase Spreading When multiple products share a common DC input supply, spreading of the switching clock phase between the products can be utilized. This dramatically reduces input capacitance requirements and efficiency losses, since the peak current drawn from the input supply is effectively spread out over the whole switch period. This requires that the products are synchronized using the SYNC pin. Interleave_order is in the range 0-15. Number_in_group is in the range 0-15 where a value of 0 means 16. The set resolution for the phase offset is 360° / 16 = 22.5°. By default Number_in_group = 0 and Interleave_order = Four LSB’s of set PMBus address (see section PMBus Addressing). Soft-start and Soft-stop The soft-start and soft-stop control functionality allows the output voltage to ramp-up and ramp-down with defined timing with respect to the control of the output. This can be used to control inrush current and manage supply sequencing of multiple controllers. The rise time is the time taken for the output to ramp to its target voltage, while the fall time is the time taken for the output to ramp down from its regulation voltage to 0 V. The on delay time sets a delay from when the output is enabled until the output voltage starts to ramp up. The off delay time sets a delay from when the output is disabled until the output voltage starts to ramp down. The phase offset is measured from the rising edge of the applied external clock to the rising edge of the PWM pulse as illustrated below. Output control On Delay Time On Ramp time VOUT Illustration of Soft-Start and Soft-Stop. cui.com Off Delay Time Off Ramp Time For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER By default soft-stop is disabled and the regulation of output voltage stops immediately when the output is disabled. Soft-stop can be enabled through the PMBus command ON_OFF_CONFIG. The delay and ramp times can be reconfigured using the PMBus commands TON_DELAY, TON_RISE, TOFF_DELAY and TOFF_FALL. VOUT Output Voltage Sequencing A group of products may be configured to power up in a predetermined sequence. This feature is especially useful when powering advanced processors, FPGAs, and ASICs that require one supply to reach its operating voltage prior to another. date 09/03/2015 │ page 25 of 33 Soft-start ramp time Time Illustration of Pre-Bias Startup. Voltage Tracking The product integrates a lossless tracking scheme that allows its output to track a voltage that is applied to the VTRK pin with no external components required. During ramp-up, the output voltage follows the VTRK voltage until the preset output voltage level is met. The product offers two modes of tracking as follows: VOUT VOUT1 VOUT2 1. Time Illustration of Output Voltage Sequencing. Coincident. This mode configures the product to ramp its output voltage at the same rate as the voltage applied to the VTRK pin. Different types of multi-product sequencing are supported: 1. Time based sequencing. Configuring the start delay and rise time of each module through the PMBus interface and by connecting the CTRL pin of each product to a common enable signal. 2. Event based sequencing. Routing the PG pin signal of one module to the CTRL pin of the next module in the sequence. 3. DDC based sequencing. Power Good triggered sequencing with the same flexibility as time based sequencing. Configured through the PMBus interface and uses the DDC bus, see section Digital-DC bus. Pre-Bias Startup Capability Pre-bias startup often occurs in complex digital systems when current from another power source is fed back through a dual supply logic component, such as FPGAs or ASICs. There could also be still charged output capacitors when starting up shortly after turn-off. The product incorporates synchronous rectifiers, but will not sink current during startup, or turn off, or whenever a fault shuts down the product in a pre-bias condition. Illustration of Coincident Voltage Tracking. 2. Ratiometric. This mode configures the product to ramp its output voltage at a rate that is a percentage of the voltage applied to the VTRK pin. The default setting is 50%, but a different tracking ratio may be set by an external resistive voltage divider. Illustration of Ratiometric Voltage Tracking. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER The master device in a tracking group is defined as the device that has the highest target output voltage within the group. This master device will control the ramp rate of all tracking devices and is not configured for tracking mode. Any device configured in tracking mode will ignore its soft-start/stop settings and take on the turn-on/turn-off characteristics of the voltage present at the VTRK pin. All of the CTRL pins in the tracking group must be connected and driven by a single logic source. Tracking is configured using the PMBus command TRACK_CONFIG. Digital-DC Bus The Digital-DC Bus, DDC, is used to communicate b etween products. This dedicated single wire bus provides the communication channel between devices for features such as sequencing, fault spreading and current sharing. The DDC solves the PMBus data rate limitation. The DDC pin on all devices in an application should be connected together. A pullup resistor is required on the common DDC in order to guarantee the rise time as follows: date 09/03/2015 │ page 26 of 33 Broadcast Control The product can be configured to broadcast output voltage enable or setting of output voltage level over the DDC bus to other devices in the group. If configured to do so, a device receiving a PMBus OPERATION command or VOUT_COMMAND command will broadcast the same command over the DDC bus, and other devices on the DDC bus will respond to the same commands. Broadcast control is configured using the PMBus c ommand DDC_GROUP. Fault Spreading The product can be configured to broadcast a fault event over the DDC bus to the other devices in the group. When a nondestructive fault occurs and the device is configured to shut down on a fault, the device will shut down and b roadcast the fault event over the DDC bus. The other d evices on the DDC bus will shut down together if configured to do so, and will attempt to re-start in their prescribed order if configured to do so. Fault spreading is configured using the PMBus command DDC_GROUP and LEGACY_FAULT_GROUP. T = RDDCCDDC≤1μs Where RDDC is the pull up resistor value and CDDC is the bus loading. The pull-up resistor should be tied to an external supply voltage in range from 2.5 to 5.5 V, which should be present prior to or during power-up. The DDC is an internal bus, such that it is only connected across the modules and not the PMBus system host. DDC addresses are assigned on a rail level, i.e. modules within the same current sharing group share the same DDC address. Addressing rails across the DDC is done with a 5 bit DDC ID, yielding a theoretical total of 32 rails that can be shared with a single DDC bus. By default the DDC ID is set to the five LSB’s of set PMBus address (see section PMBus Addressing). Parallel Operation (Current Sharing) Paralleling multiple products can be used to increase the output current capability of a single power rail. By connecting the DDC and SYNC pins of each device and configuring the devices as a current sharing rail, the units will share the current equally, enabling up to 100% utilization of the current capability for each device in the current sharing rail. The product uses a low bandwidth, first-order digital current sharing by aligning the output voltage of the slave devices to deliver the same current as the master device. Artificial droop resistance is added to the output voltage path to control the slope of the load line curve, calibrating out the physical parasitic mismatches due to power train components and PWB layout. Up to 4 devices can be configured in a given current sharing group. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER THERMAL CONSIDERATION NDM3Z-90V General The product is designed to operate in different thermal environments and sufficient cooling must be provided to ensure reliable operation. Cooling is achieved mainly by conduction, from the pins to the host board, and convection, which is dependent on the airflow across the product. Increased airflow enhances the cooling of the product. The Output Current Derating graph found in the Output section for each model provides the available output current vs. ambient air temperature and air velocity at specified VI. The product is tested on a 254 x 254 mm, 35 μm (1 oz), test board mounted vertically in a wind tunnel with a cross-section of 608 x 203 mm. The test board has 16 layers. Definition of Product Operating Temperature The temperature at positions P1, P2, P3, P4 and P5 should not exceed the maximum temperatures in the table below. The number of measurement points may vary with d ifferent thermal designs and topologies. Temperatures above specified maximum measured at the specified positions are not a llowed and may cause permanent damage. Note that the max values are the absolute maximum rating (non destruction) and that the provided Electrical Specification data is guaranteed up to TP1 = +95°C. Position Description Max. Temperature P1 power switch 130°C P2 power switch 130°C P3 VR controller 125°C P4 power inductor 125°C P5 power inductor 125°C NDM3Z-90HT AIR FLOW P5 date 09/03/2015 │ page 27 of 33 P4 Temperature positions and air flow direction (top view). AIR FLOW P3 P1 P2 Temperature positions and air flow direction. Note that the same PCB is used for both the NDM3Z-90HT and the NDM3Z-90V. Thus, the positions indicated in the pictures apply to both versions. Definition of Reference Temperature TP1 The temperature at position P1 has been used as a reference temperature for the Electrical Specification data provided. Over Temperature Protection (OTP) The products are protected from thermal overload by dual internal over temperature shutdown functions: 1. Temperature in VR controller, located in position P3. 2. The highest temperature of power switches, located in positions P1 and P2. These temperatures are continously monitored and when a temperature rises above the configured fault threshold level the product will respond as configured. The product can respond in several ways as follows: 1. Immediate and definite shutdown of output voltage until the fault is cleared by PMBus command CLEAR_FAULTS or the output voltage is re-enabled. 2. Immediate shutdown of output voltage while the temperature is above the warning threshold. Operation resumes automatically and the output is enabled when the temperature has fallen below the warning threshold, i.e. there is a hysteresis defined by the difference between the fault threshold and the warning threshold. Default response is option 2. The default OTP thresholds and hysteresis are specified in Electrical Characteristics. The OTP limit, hysteresis and response for temperature in position P3 is configured using the PMBus commands OT_FAULT_LIMIT, OT_WARN_LIMIT and cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER OT_FAULT_RESPONSE. The OTP limit, hysteresis and response for highest temperature of positions P1 and P2 are configured using the PMBus commands MFR_VMON_OV_ FAULT_LIMIT and VMON_OV_FAULT_RESPONSE. PCB Layout Considerations The radiated EMI performance of the product will depend on the PCB layout and ground layer design. If a ground layer is used, it should be connected to the output of the product and the equipment ground or chassis. A ground layer will increase the stray capacitance in the PCB and improve the high frequency EMC performance. Further layout recommendations are listed below. • The pin strap resistors, RSET, and RSA should be placed as close to the product as possible to minimize loops that may pick up noise. • Avoid current carrying planes under the pin strap resistors and the PMBus signals. • The capacitors CIN should be placed as close to the input pins as possible. • The capacitors COUT should be placed close to the load. • The point of output voltage sense should be “down stream” of COUT. • Care should be taken in the routing of the connections from the sensed output voltage to the +S and –S terminals. These sensing connections should be routed as a differential pair, preferably between ground planes which are not carrying high currents. The routing should avoid areas of high electric or magnetic fields. • If possible use planes on several layers to carry VIN, VOUT and GND. There should be a large number of vias close to the VIN, VOUT and GND pads in order to lower input and output impedances and improve heat spreading between the product and the host board. cui.com date 09/03/2015 │ page 28 of 33 For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER SOLDERING INFORMATION - Surface Mounting and Through-Hole Mount Pin in Paste Assembly The surface mount product is intended for forced c onvection or vapor phase reflow soldering in SnPb or Pb-free processes. The reflow profile should be optimised to avoid excessive heating of the product. It is recommended to have a sufficiently extended preheat time to ensure an even temperature across the host PWB and it is also recommended to minimize the time in reflow. A no-clean flux is recommended to avoid entrapment of cleaning fluids in cavities inside the product or between the product and the host board, since cleaning residues may affect long term reliability and isolation voltage. General reflow process specifications SnPb eutectic Pb-free average ramp up (TPRODUCT) 3°C/s max 3°C/s max Typical solder melting (liquidus) temperature (TL) 183°C 221°C Minimum reflow time above TL 60s 60s Minimum pin temperature (TPIN) 210°C 235°C 225°C 260°C Average ramp-down (TPRODUCT) 6°C/s max 6°C/s max Maximum time 25°C to peak 6 minutes 8 minutes Temperature Pin profile TL Time in preheat / soak zone Time 25°C to peak Time in reflow board, up to a recommended maximum temperature of 245°C could be used, if the products are kept in a c ontrolled environment (dry pack handling and storage) prior to assembly. Lead-free (Pb-free) solder processes For Pb-free solder processes, a pin temperature (TPIN) in excess of the solder melting temperature (TL, 217 to 221°C for SnAgCu solder alloys) for more than 60 seconds and a peak temperature of 245°C on all solder joints is recommended to ensure a reliable solder joint. Maximum Product Temperature Requirements Top of the product PWB near pin 10A is chosen as reference location for the maximum (peak) allowed product temperature (TPRODUCT) since this will likely be the warmest part of the product during the reflow process. SnPb solder processes For SnPb solder processes, the product is qualified for MSL 1 according to IPC/JEDEC standard J-STD-020C. During reflow TPRODUCT must not exceed 225 °C at any time. Peak product temperature (TPRODUCT) TPRODUCT maximum TPIN minimum date 09/03/2015 │ page 29 of 33 Product profile Dry Pack Information Products intended for Pb-free reflow soldering processes are delivered in standard moisture barrier bags according to IPC/JEDEC standard J-STD-033 (Handling, packing, shipping and use of moisture/reflow sensitivity surface mount devices). Using products in high temperature Pb-free soldering processes requires dry pack storage and handling. In case the products have been stored in an uncontrolled environment and no longer can be considered dry, the modules must be baked according to J-STD-033. Thermocoupler Attachment Time Minimum Pin Temperature Recommendations Pin number 3C is chosen as reference location for the minimum pin temperature recommendation since this will likely be the coolest solder joint during the reflow process. SnPb solder processes For SnPb solder processes, a pin temperature (TPIN) in excess of the solder melting temperature, (TL, 183°C for S n63Pb37) for more than 60 seconds and a peak temperature of 220°C is recommended to ensure a reliable solder joint. For dry packed products only: depending on the type of solder paste and flux system used on the host cui.com Pin 3C for measurement of minimum Pin (solder joint) temperature, TPIN Top of PWB near Pin 10A for measurement of maximum product temperature, TPRODUCT For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER SOLDERING INFORMATION - Hole Mounting Tray Specifications The hole mounted product is intended for plated through hole mounting by wave or manual soldering. The pin temperature is specified to maximum to 270°C for maximum 10 seconds. A maximum preheat rate of 4°C/s and maximum preheat temperature of 150°C is s uggested. When soldering by hand, care should be taken to avoid direct contact between the hot soldering iron tip and the pins for more than a few seconds in order to prevent overheating. A no-clean flux is recommended to avoid entrapment of cleaning fluids in cavities inside the product or between the product and the host board. The cleaning residues may affect long time reliability and isolation voltage. Delivery Package Information The products are delivered in antistatic trays and in antistatic carrier tape (EIA 481 standard). Carrier Tape Specifications material antistatic PS surface resistance 10 < Ohm/square < 1010 bakeability the tape is not bakeable tape width, W 72 mm [2.83 inch] 5 pocket pitch, P1 32 mm [1.26 inch] pocket depth, K0 14.6 mm [0.575 inch] reel diameter 330 mm [13 inch] reel capacity 130 products/reel reel weight TBD date 09/03/2015 │ page 30 of 33 cui.com material antistatic PS surface resistance 101 < Ohm/square < 106 bakeability the trays are not bakeable tray thickness 18 mm [0.724 inch] box capacity 90 products (5 full trays/box) tray weight TBD For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 31 of 33 PRODUCT QUALIFICATION SPECIFICATIONS Characteristics External visual inspection IPC-A-610 Change of temperature (Temperature cycling) IEC 60068-2-14 Na Temperature range Number of cycles Dwell/transfer time -40 to 100°C 1000 15 min/0-1 min Cold (in operation) IEC 60068-2-1 Ad Temperature TA Duration -45°C 72 h Damp heat IEC 60068-2-67 Cy Temperature Humidity Duration 85°C 85 % RH 1000 hours Dry heat IEC 60068-2-2 Bd Temperature Duration 125°C 1000 h Electrostatic discharge susceptibility IEC 61340-3-1, JESD 22-A114 IEC 61340-3-2, JESD 22-A115 Human body model (HBM) Machine Model (MM) Class 2, 2000 V Class 3, 200 V Immersion in cleaning solvents IEC 60068-2-45 XA, method 2 Water Glycol ether Isopropyl alcohol 55°C 35°C 35°C Mechanical shock IEC 60068-2-27 Ea Peak acceleration Duration 100 g 6 ms Moisture reflow sensitivity1 J-STD-020C Level 1 (SnPb-eutectic) Level 3 (Pb Free) 225°C 260°C Operational life test MIL-STD-202G, method 108A Duration 1000 h Resistance to soldering heat2 IEC 60068-2-20 Tb, method 1A Solder temperature Duration 270°C 10-13 s Robustness of terminations IEC 60068-2-21 Test Ua1 IEC 60068-2-21 Test Ue1 Through hole mount products Surface mount products All leads All leads IEC 60068-2-58 test Td 1 Preconditioning Temperature, SnPb Eutectic Temperature, Pb-free 150°C dry bake 16 h 215°C 235°C IEC 60068-2-20 test Ta 2 Preconditioning Temperature, SnPb Eutectic Temperature, Pb-free Steam ageing 235°C 245°C IEC 60068-2-64 Fh, method 1 Frequency Spectral density Duration 10 to 500 Hz 0.07 g2/Hz 10 min in each direction Solderability Vibration, broad band random Notes: 1. Only for products intended for reflow soldering (surface mount products). 2. Only for products intended for wave soldering (plated through hole products) General Information The calculations for CUI module failure rate (λ) and mean time between failures (MTBF) are calculated at maximum output power and operating ambient temperature (TA) of + 40ºC. The Telcordia SR-332 Issue 2 Method 1 (parts count method) is used to calculate the mean steady-state failure rate and standard deviation (σ). The MTBF is defined as 1/ λ. For the NDM3Z-90: λ 36 nFailures/h σ 7 nFailures/h MTBF 27 Mh MTBF at 90% confidence level 22 Mh cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 32 of 33 Compatibility with RoHS Requirements CUI NDM modules are compatible with the relevant clauses and requirements of RoHS directive 2011/65/EU. They have a maximum concentration of 0.01% by weight of cadmium and 0.1% by weight in homogeneous materials for lead, mercury, hexavalent chromium, PBB and PBDE. The Statement of Compliance document notes exemptions to the RoHS directive present in CUI Novum modules. CUI Novum modules meet and will continue to meet the obligations under regulation (EC) No 1907/2006 addressing the registration, evaluation, authorization and restriction of chemicals (REACH) as they become applicable. CUI will utilize the product materials declarations to communicate information on substances in the products. Quality Statement High quality of CUI products are achieved through conservative design rules, numerous design reviews and product qualifications. Products are designed and manufactured with a philosophy where quality systems and methods such as ISO 9000, Six Sigma and SPC are employed to ensure continuous improvements. Modules with early failures are screened out and parts are subjected to ATE-based final testing. Safety CUI NDM modules are designed in accordance with safety standards IEC/EN/UL 60950-1 Safety of Information Technology Equipment. On-board DC/DC converters and DC/DC regulators are defined as component power supplies and thus cannot fully c omply with the provisions of any safety requirements without “conditions of acceptability”. Clearance between c onductors and between conductive parts of the component power supply and conductors on the board in the final product must meet the applicable safety requirements. Certain conditions of acceptability apply for component power supplies with limited stand-off (see Mechanical Information and Safety Certificate for further information). It is the responsibility of the installer to ensure that the final product housing these components complies with the requirements of all applicable safety standards and regulations for the final product. CUI NDM modules are certified in accordance with EN 60950-1 and UL 60950-1 recognized. All parts of the CUI NDM modules meet the flammability rating requirements for V-0 class material according to IEC 60695-11-10, Fire hazard testing, test flames – 50 W horizontal and vertical flame test methods. A slow blow fuse is recommended to be placed at the input of each DC/DC converter. The fuse should be placed in front of the input filter if such a filter is used. The fuse will provide the following functions in the rare event of a component problem that imposes a short circuit on the input source: • Isolate the fault from the input power source so as to isolate the fault from the other parts of the system • Protect the distribution wiring from excessive current thus preventing hazardous overheating The DC/DC regulator output is SELV if the input source meets the requirements for SELV circuits according to IEC/EN/UL 60950-1. cui.com For more information, please visit the product page. CUI Inc │ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER date 09/03/2015 │ page 33 of 33 REVISION HISTORY rev. date 1.02 09/03/2015 The revision history provided is for informational purposes only and is believed to be accurate. Headquarters 20050 SW 112th Ave. Tualatin, OR 97062 800.275.4899 Fax 503.612.2383 cui.com [email protected] Architects of Modern Power and AMP Group are trademarks of CUI. Novum is a trademark of CUI. PMBus is a trademark of SMIF, Inc. Digital-DC is a trademark of Intersil Corporation. CUI Novum products use patented technology licensed from Power-One. All other trademarks are the property of their respective owners. CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website. CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use. CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.