User Guide 003 lSL8272MEVAL1Z Evaluation Board User Guide Description Key Features The ISL8272M is a 50A step-down DC/DC power supply module with an integrated digital PWM controller, dual-phase synchronous power switches, inductors and passives. Only input output capacitors and minimal passives are needed to finish the design. 50A of continuous output current can be delivered without a need of airflow or heatsink. The ISL8272M uses ChargeMode™ control (ASCR) architecture, which responds to a transient load within a single switching cycle. • VIN range of 4.5V to 14V, VOUT adjustable from 0.6V to 5V • Programmable VOUT, margining, input and output UVP/OVP, IOUT limit, OTP/UTP, soft-start/stop, sequencing, and external synchronization • Monitor: VIN, VOUT, IOUT, temperature, duty cycle, switching frequency and faults • ChargeMode™ control tunable with PMBus • Mechanical switch for enable and power-good LED indicator The ISL8272MEVAL1Z evaluation board is a 4.7in x 4.8in 6-layer FR4 board with 2oz. copper in all layers. This evaluation board comes with placeholders for pin-strap resistor population to adjust output voltage, switching frequency, softstart/stop timing and input UVLO threshold, ASCR gain and residual parameters and device PMBus™ address. More configurations, such as sequencing, Digital-DC™ (DDC) bus configuration and fault limits can be easily programmed or changed via PMBus compliant serial bus interface. Specifications This board has been configured for the following operating conditions by default: • VIN = 5V to 12V • VOUT = 1.2V • IMAX = 50A ZLUSBEVAL3Z (USB to PMBus adapter) is provided with this evaluation kit, which connects the evaluation board to a PC to activate the PMBus communication interface. The PMBus command set is accessed by using the PowerNavigator™ evaluation software from a PC running Microsoft Windows. • fSW = 421kHz • Peak efficiency: >90.5% at 70% load • Output ripple: <10mVP-P • ASCR gain = 200, ASCR residual = 90 References • On/off delay = 5ms; On/off ramp time = 5ms Ordering Information ISL8272M datasheet PART NUMBER ISL8272MEVAL1Z PGOOD LED INTERCONNECTS DDC AND SYNC BETWEEN BOARDS ENABLE SWITCH DESCRIPTION ISL8272M Kit (Evaluation Board, ZLUSBEVAL3Z Adapter, USB Cable) INTERCONNECTS DDC AND SYNC BETWEEN BOARDS TO DAISY CHAIN PMBus CONNECTION CONNECT TO ZLUSBEVAL3Z DONGLE. FOR MULTIPLE BOARD EVALUATION, CONNECT TO PMBus DONGLE OUT CONNECTION OF OTHER BOARD VOUT REGULATION MONITOR FIGURE 1. TOP SIDE September 17, 2014 UG003.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. All Rights Reserved Intersil (and design), PowerNavigator, ChargeMode and Digital-DC are trademarks owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. User Guide 003 RESISTOR PLACEHOLDERS FIGURE 2. BOTTOM SIDE Recommended Equipment 3. Connect power supply to VIN connectors (J5 and J6). Make sure power supply is not enabled when making connection. • DC power supply with minimum 15V/25A sourcing capacity 4. Turn power supply on. • Electronic load capable of sinking current up to 50A 5. Set ENABLE switch to “ENABLE”. • Digital multimeters (DMMs) • Oscilloscope with higher than 100MHz bandwidth 6. Measure 1.2V VOUT at probe point labeled “VOUT REGULATION MONITOR” (J11). Functional Description 7. Observe switching frequency of 421kHz at probe points labeled “PHASE1” (TP10) and “PHASE2” (TP11). The ISL8272MEVAL1Z provides all circuitry required to evaluate the features of the ISL8272M. A majority of the features of the ISL8272M, such as compensation-free ChargeMode™ control, soft-start delay and ramp times, supply sequencing, and voltage margining are available on this evaluation board. For sequencing evaluation, the board can be connected to any Intersil digital module evaluation board that supports the DDC bus. Figures 1 and 2 show the board images of the ISL8272MEVAL1Z evaluation board. Quick Start Guide Pin-Strap Option ISL8272MEVAL1Z can be configured in pin-strap mode with standard 1% 0603 resistors. PMBus interface is not required to evaluate ISL8272M in pin-strap mode. Output voltage (VOUT), switching frequency (fSW), soft-start/stop delay and ramp time, input undervoltage protection (UVLO) threshold, ASCR gain and residual, and device PMBus address can be changed by populating recommended resistors at placeholders provided in the evaluation board. By default, the evaluation board operates in pin-strap mode and regulates at VOUT = 1.2V, fSW = 421kHz, soft-start/stop delay time = 5ms, soft-start/stop ramp time = -5ms, UVLO = 4.5V, ASCR gain = 200, ASCR residual = 90 and PMBus address = 28h. Follow these steps to evaluate ISL8272M in pin-strap mode. 1. Set ENABLE switch to “DISABLE”. 2. Connect Load to VOUT lug connectors (J7-J8 and J9-J10). Submit Document Feedback 2 8. To measure the module efficiency, connect the multimeter voltage probes at probe points labeled “VIN” (TP1), “GND” (TP2) and “VOUT” (TP12). 9. To change VOUT, disconnect board from the setup and populate a 1% standard 0603 resistor at RVSET placeholder location on bottom layer. Refer to the “Output Voltage Resistor Settings” table in the ISL8272M datasheet for recommended values. By default, VOUT_MAX is set to 110% of VOUT set by pin-strap resistor. 10. To change switching frequency, disconnect board from the setup and populate a 1% standard 0603 resistor at RFSET placeholder location on bottom layer. Refer to the “Switching Frequency Resistor Settings” table in the ISL8272M datasheet for recommended values. 11. To change soft-start/stop delay and ramp time, disconnect board from the setup and populate a 1% standard 0603 resistor at R6 placeholder location on bottom layer. Refer to the “Soft Start/Stop Resistor Settings” table in the ISL8272M datasheet for recommended values. 12. To change UVLO, disconnect board from the setup and populate a 1% standard 0603 resistor at R6 placeholder location on bottom layer. Refer to the “UVLO Resistor Settings” table in the ISL8272M datasheet for recommended values. Notice that the UVLO programming shares the same pin with soft-start/stop programming. 13. To change ASCR gain and residual, disconnect board from the setup and populate a 1% standard 0603 resistor at R7 placeholder location on bottom layer. Refer to the “ASCR UG003.0 September 17, 2014 User Guide 003 Resistor Settings” table and the design guide matrix in the ISL8272M datasheet for recommended values. PMBus Option ISL8272MEVAL1Z can be evaluated for all features using the provided ZLUSBEVAL3Z dongle and PowerNavigator™ evaluation software. Follow these steps to evaluate ISL8272M with PMBus option. 11. Monitor and configure the ISL8272MEVAL1Z board using the PMBus commands in the evaluation software. To store the configuration changes, disable the module and use the command STORE_USER_ALL. To restore factory default settings, disable the module and use the command RESTORE_FACTORY and STORE_USER_ALL. 12. PowerNavigator™ tutorial videos are available at Intersil website. www.intersil.com/powernavigator 5. Turn power supply on. 13. For sequencing via Digital-DC Bus (DDC) or to evaluate multiple Intersil digital power products using a single ZLUSBEVAL3Z dongle, ISL8272M can be daisy chained with other digital power evaluation boards. PMBus address can be changed by placing a 1% standard 0603 resistor at the R4 placeholder location on the bottom layer. Refer to the “SMBus Address Resistor Selection” table in the ISL8272M datasheet for recommended values. 6. Connect ZLUSBEVAL3Z dongle (USB to PMBus™ adapter) to ISL8272MEVAL1Z board to the 6-pin male connector labeled as “PMBus DONGLE IN”. Thermal Considerations and Current Derating 7. Connect supplied USB cable from computer USB to ZLUSBEVAL3Z dongle. Board layout is very critical in order to make the module operate safely and deliver maximum allowable power. To work in the high temperature environments and carry large currents, the board layout needs to be carefully designed to maximize thermal performance. To achieve this, select enough trace width, copper weight and the proper connectors. 1. Install PowerNavigator™ software from the following Intersil website: www.intersil.com/powernavigator 2. Set ENABLE switch to “DISABLE”. 3. Connect Load to VOUT lug connectors (J7-J8 and J9-J10). 4. Connect power supply to VIN connectors (J5 and J6). Make sure power supply is not enabled when making connection. 8. Launch PowerNavigator™ software. 9. It is optional to load a predefined set-up from a configuration file using the PowerNavigator™ software. The ISL8272M device on the board operates in pin-strap mode from factory default, but the user may modify the operating parameters through the evaluation software or by loading a predefined set-up from a configuration file. A sample “Configuration File” on page 6 is provided and can be copied to a notepad editor to make desired changes. The default pin-strap configurations will be overwritten if a user-defined configuration file is loaded. 10. Set ENABLE switch to “ENABLE”. Alternatively, the PMBus ON_OFF_CONFIG and OPERATION commands may be used from the PowerNavigator™ software to allow PMBus Enable. Submit Document Feedback 3 The ISL8272MEVAL1Z evaluation board is designed for running 50A at room temperature without additional cooling systems needed. However, if the output voltage is increased or the board is operated at elevated temperatures, then the available current is derated. Refer to the derated current curves in the ISL8272M datasheet to determine the maximum output current the evaluation board can supply. JA is measured by inserting a thermocouple inside the module to measure peak junction temperature. UG003.0 September 17, 2014 5 10K R10 C9 SDA SCL 1 VI2C 3 TP1 2 SW1 TP8 3 2 4 6 1 2 3 4 5 6 SALRT J3 SYNC UNNAMED_1_CONN6_I259_IN2 1 3 5 1 2 3 4 5 6 1 3 5 1 DISABLE 2 4 6 DDC UNNAMED_1_CONN6_I259_IN5 UNNAMED_1_CONN6_I259_IN6 TO SEQUEL J2 UNNAMED_1_GTSERIES_I236_NC VIN J1 TO SEQUEL ENABLE EN FROM PREQUEL FROM PREQUEL VCC TP9 10UF Submit Document Feedback ISL8272MEVAL1Z Schematic J4 2 4 6 1 2 3 4 5 6 1 3 5 1 2 3 4 5 6 2 4 6 J7 COMMUNICATION CONNECTION INTER-DEVICE CONNECTION J8 PHASE1 TP12 E14 D14 R11 UNNAMED_1_SMRES_I282_A R9 VCC PG R8 1.5K UNNAMED_1_SMRES_I247_B J10 EN NC 3 1 1.5K GRN D1 UNNAMED_1_SMRES_I197_B 4 2 R7 DNP 10UF 10UF 3 10UF C12 C11 C10 10UF C8 UNNAMED_1_NCHANNEL_I231_D Q1 1 2 PGND TIED TO SGND DRAWN BY: UNDER DUT EVAN JIANG 2N7002L DATE: ENGINEER: RELEASED BY: DATE: DATE: DATE: EVAN JIANG 07/31/2014 UPDATED BY: TITLE: ISL8272M 50A TIM KLEMANN J11 200 UNNAMED_1_SMRES_I246_B VR6 TP7 1 2 R13 22UF CVSEN C25 470UF C24 470UF C23 100UF J9 TP11 VR5 VCC C22 C21 100UF C20 100UF C19 470UF C18 470UF C16 100UF C15 100UF C14 100UF C13 100UF 0 TP6 TP4 GND R12 RED V25 TP5 VDRV1 VDRV1 VDD N6 N16 M1 G15 L14 M13 R6 DNP DNP RVSET DNP R4 UNNAMED_1_SMRES_I204_B VOUT UNNAMED_1_SMRES_I283_A PHASE2 10UF R5 DNP DNP RFSET 6.65K R2 UNNAMED_1_SMRES_I198_B U1 PAD1 PAD3 PAD5 L3 PAD14 PAD13 H4 H3 PAD2 PAD4 PAD7 P11 PAD16 PAD15 E15 F15 D5 G14 C17 R1 C1 0.1UF SS/UVLO VMON ISL8272MIRZ 0 VOUT PGND PGND SWD1 SW1 PGND VSENP VSENN VOUT PGND PGND SWD2 SW2 PGND NC NC PG ASCR User Guide 003 100K TP3 PGND PGND PGND PGND PGND 4.75K SCL SDA SALRT SA DDC SYNC NC NC VSET NC MGN CS SS/UVLO VMON SGND SGND SGND SGND SGND PAD10 PAD12 M5 M17 N5 R3 VR VR55 VCC C13 C12 C11 C10 E4 D13 F4 G4 C6 C5 C8 C7 D4 C9 H16 J16 K16 M14 PAD6 VDRV VDRV VCC V25 VR5 VR6 SCL SDA SALRT SA DDC SYNC VIN VIN VIN TP2 100UF R8 R17 L2 M10 TP10 K14 PAD8 PAD9 PAD11 GND J6 VCC VR55 C26 22UF C2 22UF C7 22UF C6 22UF C5 22UF C4 22UF C3 4 470UF J5 08/05/2014 TESTER EVALUATION BOARD SCHEMATIC UG003.0 September 17, 2014 User Guide 003 Bill of Materials REFERENCE DESIGNATORS QTY C1 1 PANASONIC ECJ-2VB1E104K CAP, SMD, 0805, 0.1µF, 25V, 10%, X7R, ROHS CVSEN 1 TDK C2012X5R0J226M CAP, SMD, 0805, 22µF, 6.3V, 20%, X5R, ROHS C8, C10-C12, C17 5 VENKEL C1206X7R100-106KNE CAP, SMD, 1206, 10µF, 10V, 10%, X7R, ROHS C9 1 VENKEL C1206X7R250-106KNE CAP, SMD, 1206, 10µF, 25V, 10%, X7R, ROHS C13, C14, C15, C16, C22, C23 6 MURATA GRM31CR60J107ME39L CAP, SMD, 1206, 100µF, 6.3V, 20%, X5R, ROHS C20, C21 0 C2, C4, C5, C6, C7, C26 6 MURATA GRM32ER71C226KE18L CAP, SMD, 1210, 22µF, 16V, 10%, X7R, ROHS C24, C25 2 SANYO 6TPE470MI CAP-POSCAP, LOW ESR, SMD, D4, 470µF, 6.3V, 20%, 18mΩ, ROHS C3 1 PANASONIC EEE-1EA471P CAP, SMD, 10mm, 470µF, 25V, 20%, ALUM.ELEC., 380mA, ROHS J5, J6 2 JOHNSON COMPONENTS 108-0740-001 CONN-JACK, BANANA-SS-SDRLESS, VERTICAL, ROHS TP1-TP4, TP9-TP12 8 KEYSTONE 5005 CONN-COMPACT TEST PT, VERTICAL,RED, ROHS J11 1 BERG/FCI 69190-202HLF CONN-HEADER, 1X2, RETENTIVE, 2.54mm, 0.230 x 0.120, ROHS J2, J4 2 SAMTEC SSQ-103-02-T-D-RA CONN-SOCKET STRIP, TH, 2x3, 2.54mm, TIN, R/A, ROHS J1, J3 2 SAMTEC TSW-103-08-T-D-RA CONN-HEADER, 2x3, BRKAWY, 2.54mm, TIN, R/A, ROHS D1 1 LUMEX SSL-LXA3025IGC-TR LED, SMD, 3x2.5mm, 4P, RED/GREEN, 12/20MCD, 2V U1 1 INTERSIL ISL8272MAIRZ IC-50A DIGITAL DC/DC MODULE, 42P, HDA, ROHS Q1 1 ON SEMICONDUCTOR 2N7002LT1G TRANSISTOR-MOS, N-CHANNEL, SMD, SOT23, 60V, 115mA, ROHS R4, R5, R6, R7, RFSET, RVSET 0 R11, R12 2 VENKEL CR0603-10W-000T RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS R10 1 KOA RK73H1JT1002F RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS R1 1 VENKEL CR0603-10W-1003FT RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS R8, R9 2 VENKEL CR0603-10W-1501FT RES, SMD, 0603, 1.5k, 1/10W, 1%, TF, ROHS R3 1 VENKEL CR0603-10W-4751FT RES, SMD, 0603, 4.75k, 1/10W, 1%, TF, ROHS R2 1 YAGEO RC0603FR-076K65L RES, SMD, 0603, 6.65k, 1/10W, 1%, TF, ROHS R13 1 PANASONIC ERJ-8ENF2000V RES, SMD, 1206, 200Ω, 1/4W, 1%, TF, ROHS SW1 1 C&K COMPONENTS GT13MCBE SWITCH-TOGGLE, THRU-HOLE, 5PIN, SPDT, 3POS, ON-OFF-ON, ROHS J7, J8, J9, J10 4 BERG/FCI KPA8CTP HDWARE, MTG, CABLE TERMINAL, 6-14AWG, LUG&SCREW, ROHS C18, C19 0 DO NOT POPULATE TP5, TP6, TP7, TP8 0 DO NOT POPULATE Submit Document Feedback 5 MANUFACTURER MANUFACTURER PART DESCRIPTION CAP, SMD, 1206, DNP-PLACEHOLDER, ROHS RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACEHOLDER UG003.0 September 17, 2014 User Guide 003 Configuration File Sample Configuration File for ISL8272M Module. Copy and paste (from RESTORE_FACTORY TO ### End User Store) to a notepad and save it as Confile_file_name.txt. The # symbol is used for a comment line. Following settings are already loaded to ISL8272M module as factory defaults. RESTORE_FACTORY STORE_USER_ALL # VOUT Related VOUT_COMMAND VOUT_MAX VOUT_MARGIN_HIGH VOUT_MARGIN_LOW VOUT_OV_FAULT_LIMIT VOUT_OV_FAULT_RESPONSE VOUT_OV_WARN_LIMIT VOUT_UV_WARN_LIMIT VOUT_UV_FAULT_LIMIT VOUT_UV_FAULT_RESPONSE POWER_GOOD_ON VOUT_TRANSITION_RATE VOUT_DROOP VOUT_CAL_OFFSET # IOUT Related IOUT_CAL_GAIN IOUT_CAL_OFFSET IOUT_OC_FAULT_LIMIT IOUT_UC_FAULT_LIMIT MFR_IOUT_OC_FAULT_RESPONSE MFR_IOUT_UC_FAULT_RESPONSE ISENSE_CONFIG # Other Faults OT_FAULT_LIMIT OT_FAULT_RESPONSE OT_WARN_LIMIT UT_WARN_LIMIT UT_FAULT_LIMIT UT_FAULT_RESPONSE VIN_OV_FAULT_LIMIT VIN_OV_FAULT_RESPONSE VIN_OV_WARN_LIMIT VIN_UV_WARN_LIMIT VIN_UV_FAULT_LIMIT VIN_UV_FAULT_RESPONSE #Enable, Timing and Sequence Related ON_OFF_CONFIG TON_DELAY TON_RISE TOFF_DELAY TOFF_FALL POWER_GOOD_DELAY FREQUENCY_SWITCH SYNC_CONFIG SEQUENCE # Manufacturer Related MFR_ID MFR_MODEL MFR_REVISION MFR_LOCATION MFR_DATE MFR_SERIAL USER_DATA_00 # Advance Settings USER_CONFIG DDC_CONFIG DDC_GROUP # Loop Compensation ASCR_CONFIG STORE_USER_ALL ### End User Store Submit Document Feedback 6 # reset device to the factory setting # Clears user memory space 0x2666 0x2a3c 0x2851 0x247a 0x2c28 0x80 0x2a3c 0x228f 0x20a3 0x80 0x228f 0xba00 0x0000 0x0000 # 1.2 V # 1.32 V # 1.26 V # 1.14 V # 1.38 V # Disable and no retry # 1.32 V # 1.08 V # 1.02 V # Disable and no retry # 1.08 V # 1 mV/us # 0 mV/A # 0 mV/A 0xb370 0x0000 0xe3c0 0xe440 0x80 0x80 0x05 # 0.86 mV/A #0A # 60 A # -60A # Disable and no retry # Disable and no retry # 256ns Blanking time, Mid-Range 0xebe8 0x80 0xeb70 0xdc40 0xe530 0x80 0xd380 0x80 0xd353 0xca5d 0xca40 0x80 # 125 °C # Disable and no retry # 110 °C # -30 °C # -45 °C # Disable and no retry # 14 V # Disable and no retry # 13.3 V # 4.73 V # 4.5 V # Disable and no retry 0x16 0xca80 0xca80 0xca80 0xca80 0xca00 0x0215 0x00 0x0000 # Pin Enable, Soft Off # 5 ms # 5 ms # 5 ms # 5 ms # 4 ms # 533 kHz # Use Pin-strap for FSW setting # Sequence Disabled Intersil Corp ISL8272MEVAL1Z Rev-1 Milpitas, CA 09/05/2014 1234 Module # Example Only # Example Only # Example Only # Example Only # Example Only # Example Only # Example Only 0x80 0x0a01 0x00000000 # ASCR on for Start, Open Drain PG # DDC rail ID = 10, 2-phase # All Broadcast disabled 0x15a0100 # Store all above settings to NVRAM # ASCR gain = 256, Residual = 90 UG003.0 September 17, 2014 User Guide 003 Layout FIGURE 3. SILKSCREEN TOP FIGURE 4. TOP LAYER COMPONENT SIDE Submit Document Feedback 7 UG003.0 September 17, 2014 User Guide 003 Layout (Continued) FIGURE 5. LAYER 2 FIGURE 6. LAYER 3 Submit Document Feedback 8 UG003.0 September 17, 2014 User Guide 003 Layout (Continued) FIGURE 7. LAYER 4 FIGURE 8. LAYER 5 Submit Document Feedback 9 UG003.0 September 17, 2014 User Guide 003 Layout (Continued) FIGURE 9. BOTTOM LAYER SOLDER SIDE FIGURE 10. SILKSCREEN BOTTOM Submit Document Feedback 10 UG003.0 September 17, 2014 User Guide 003 Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. 55 50 MEASURED OUTPUT CURRENT (A) MEASURED OUTPUT CURRENT (A) 55 300kHz 45 40 35 30 800kHz 25 533kHz 20 15 10 5 421kHz 0 0 5 10 15 20 25 30 35 40 45 50 50 +45°C 45 +25°C 40 35 30 +65°C 25 20 15 10 5 0 55 0 5 10 ACTUAL OUTPUT CURRENT (A) 20 25 55 35 40 45 50 55 55 45 MEASURED OUTPUT CURRENT (A) 50 300kHz 40 35 30 421kHz 800kHz 25 20 533kHz 15 10 5 0 +45°C 50 45 40 35 +25°C 30 25 20 +65°C 15 10 5 0 0 5 10 15 20 25 30 35 40 45 50 55 0 ACTUAL OUTPUT CURRENT (A) 5 10 15 20 25 30 35 40 45 50 55 ACTUAL OUTPUT CURRENT (A) FIGURE 13. OUTPUT CURRENT MEASUREMENT ACCURACY AT VIN = 12V, VOUT = 3.3V, TA = +25°C FOR VARIOUS SWITCHING FREQUENCIES FIGURE 14. OUTPUT CURRENT MEASUREMENT ACCURACY AT VIN = 12V, VOUT = 3.3V, fSW = 533kHz FOR VARIOUS AMBIENT TEMPERATURES 1.00 0.98 0.95 0.96 1.8V 2.5V 3.3V 5V 0.94 0.90 0.85 1.8V 2.5V 5V 3.3V 1.2V 0.80 1V 0.75 EFFICIENCY (%) EFFICIENCY (%) 30 FIGURE 12. OUTPUT CURRENT MEASUREMENT ACCURACY AT VIN = 12V, VOUT = 1V, fSW = 533kHz FOR VARIOUS AMBIENT TEMPERATURES FIGURE 11. OUTPUT CURRENT MEASUREMENT ACCURACY AT VIN = 12V, VOUT = 1V, TA = +25°C FOR VARIOUS SWITCHING FREQUENCIES MEASURED OUTPUT CURRENT (A) 15 ACTUAL OUTPUT CURRENT (A) 0.92 0.90 0.88 0.86 0.70 0.84 0.8V 0.65 0 5 10 15 20 25 30 IOUT (A) 35 40 45 FIGURE 15. EFFICIENCY vs OUTPUT CURRENT AT VIN = 12V, fSW = 300kHz FOR VARIOUS OUTPUT VOLTAGES Submit Document Feedback 11 50 0.8V 1V 1.2V 0.82 300 350 400 450 500 550 600 650 700 750 800 850 900 SWITCHING FREQUENCY (kHz) FIGURE 16. EFFICIENCY vs SWITCHING FREQUENCY AT VIN = 12V, IOUT = 50A FOR VARIOUS OUTPUT VOLTAGES UG003.0 September 17, 2014 User Guide 003 Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued) VOUT (50mV/DIV) VOUT (50mV/DIV) ASCR GAIN = 550 RESIDUAL = 100 ASCR GAIN = 220 RESIDUAL = 90 IOUT (25A/DIV) IOUT (25A/DIV) 50µs/DIV 20µs/DIV FIGURE 17. LOAD TRANSIENT RESPONSE AT VIN = 12V, VOUT = 1V, IOUT = 0A TO 25A (>100A/μs), fSW = 533kHz. COUT = 8 x 100μF CERAMIC + 4 x 470μF POSCAP FIGURE 18. LOAD TRANSIENT RESPONSE AT VIN = 12V, VOUT = 3.3V, IOUT = 0A TO 25A (>100A/μs), fSW = 533kHz. COUT = 4 x 100μF CERAMIC + 2 x 470μF POSCAP ENABLE ENABLE VOUT (1V/DIV) VOUT (1V/DIV) POWER-GOOD POWER-GOOD 5ms/DIV 5ms/DIV FIGURE 20. SOFT-STOP AT VIN = 12V, VOUT = 1.2V, TOFF_DELAY = 5ms, TOFF_FALL = 5ms FIGURE 19. SOFT-START AT VIN = 12V, VOUT = 1.2V, TON_DELAY = 5ms, TON_RISE = 5ms, POWER_GOOD_DELAY = 4ms PHASE1 (10V/DIV) PHASE1 (10V/DIV) PHASE2 (10V/DIV) PHASE2 (10V/DIV) VOUT (1V/DIV) VOUT (500mV/DIV) IIN (5A/DIV) 10µs/DIV FIGURE 21. OUTPUT SHORT CIRCUIT PROTECTION AT VIN = 12V, VOUT = 1.2V, fSW = 533kHz Submit Document Feedback 12 20µs/DIV FIGURE 22. OUTPUT OVERVOLTAGE PROTECTION AT VIN = 12V, VOUT = 1.2V, fSW = 533kHz, VOUT_OV_FAULT_LIMIT = 1.38V UG003.0 September 17, 2014 User Guide 003 Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued) PHASE1 (10V/DIV) PHASE1 (10V/DIV) PHASE2 (10V/DIV) PHASE2 (10V/DIV) VOUT (1V/DIV) IIN (5A/DIV) VOUT (1V/DIV) IIN (5A/DIV) 50ms/DIV 50ms/DIV FIGURE 23. OUTPUT SHORT CIRCUIT PROTECTION WITH CONTINUOUS RETRY ENABLED (HICCUP MODE), VIN = 12V, VOUT = 1.2V MODULE #1: VOUT = 1V MODULE #2: VOUT = 1.5V MODULE #3: VOUT = 2.5V FIGURE 24. OUTPUT SHORT CIRCUIT RECOVERY FROM CONTINUOUS RETRY (HICCUP MODE). VIN = 12V, VOUT = 1.2V VOUT_3 (1V/DIV) VOUT_3 (1V/DIV) VOUT_2 (1V/DIV) VOUT_2 (1V/DIV) VOUT_1 (1V/DIV) VOUT_1 (1V/DIV) ENABLE MODULE #1: VOUT = 1V MODULE #2: VOUT = 1.5V MODULE #3: VOUT = 2.5V ENABLE 5ms/DIV FIGURE 25. SOFT-START WITH OUTPUT SEQUENCING AT VIN = 12V, THREE ISL8272MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN 5ms/DIV FIGURE 26. SOFT-STOP WITH OUTPUT SEQUENCING AT VIN = 12V, THREE ISL8272MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN 10V/DIV PHASE1 OF MODULE #1 10V/DIV VOUT (200mV/DIV) PHASE2 OF MODULE #1 10V/DIV PHASE1 OF MODULE #2 10V/DIV PHASE2 OF MODULE #2 5ms/DIV FIGURE 27. DYNAMIC VOLTAGE SCALING WITH VOUT CHANGE FROM 1.1V TO 1.3V, VIN = 12V, VOUT_TRANSITION_RATE = 1mV/µs Submit Document Feedback 13 1µs/DIV FIGURE 28. PHASE SPREADING/INTERLEAVING, TWO ISL8272MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN, MODULE #1 RAIL POSITION: 0; MODULE #2 RAIL POSITION:4. VIN = 12V, VOUT_1 = 1.2V, VOUT_2 = 3.3V, fSW = 421kHz UG003.0 September 17, 2014 User Guide 003 Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued) FIGURE 29. THERMAL IMAGE AT VIN = 12V, VOUT = 1V, IOUT = 50A, fSW = 300kHz, TA = +25°C, NO AIRFLOW FIGURE 30. THERMAL IMAGE AT VIN = 14V, VOUT = 5V, IOUT = 50A, fSW = 533kHz, TA = +25°C, NO AIRFLOW Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 14 UG003.0 September 17, 2014