FEATURES High Efficiency: 91% @ 12Vin, 5V/20A out Size: 30.5x27.9x11.4mm (1.20”×1.10”×0.45”) -- Vertical 30.5x27.9x12.9mm (1.20”×1.10”×0.51”) -- Horizontal Voltage and resistor-based trim No minimum load required Output voltage programmable from 0.9Vdc to 5.0Vdc via external resistors Fixed frequency operation Input UVLO, output OCP, SCP Power good output signal Remote ON/OFF (default: positive) ISO 9001, TL 9000, ISO 14001, QS 9000, OHSAS 18001 certified manufacturing facility UL/cUL 60950-1 (US & Canada) Recognized Delphi NC20 Series Non-Isolated Point of Load DC/DC Power Modules: 12Vin, 0.9V-5.0Vout, 20A The Delphi NC20 Series, 12V input, single output, non-isolated point of load DC/DC converters are the latest offering from a world leader in power systems technology and manufacturing ― Delta Electronics, Inc. OPTIONS Vertical or horizontal mounted Negative On/Off logic The NC20 series operates from a 12V nominal input, provides up to 20A of power in a vertical or horizontal mounted through-hole package and the output can be resistor- or voltage-trimmed from 0.9Vdc to 5.0Vdc. It provides a very cost effective point of load solution. With creative design technology and optimization of component placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions. DATASHEET DS_NC12S20A_12092010 APPLICATIONS DataCom Distributed power architectures Servers and workstations LAN / WAN applications Data processing applications TECHNICAL SPECIFICATIONS (Ambient Temperature=25°C, minimum airflow=200LFM, Vin=12Vdc, nominal Vout unless otherwise specified.) PARAMETER NOTES and CONDITIONS NC12S0A0V/H20 Min. ABSOLUTE MAXIMUM RATINGS Input Voltage Operating Temperature (Vertical) Operating Temperature (Horizontal) Storage Temperature Input/Output Isolation Voltage INPUT CHARACTERISTICS Operating Input Voltage Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Hysteresis Voltage Maximum Input Current No-Load Input Current Off Converter Input Current Input Reflected-Ripple Current Input Voltage Ripple Rejection OUTPUT CHARACTERISTICS Output Voltage Adjustment Range Output Voltage Set Point Output Voltage Regulation Over Load Over Line Output Voltage Ripple and Noise Peak-to-Peak RMS Output Current Range Output Voltage Over-shoot at Start-up Output Voltage Under-shoot at Power-Off Output DC Current-Limit Inception Output Short-Circuit Current DYNAMIC CHARACTERISTICS Out Dynamic Load Response Positive Step Change in Output Current Negative Step Change in Output Current Setting Time to 10% of Peak Devitation Turn-On Transient Start-Up Time, From On/Off Control Start-Up Time, by input power Minimum Output Capacitance Maximum Output Startup Capacitive Load Minimum Input Capacitance EFFICIENCY Vo=0.9V Vo=1.2V Vo=1.8V Vo=2.5V Vo=3.3V Vo=5.0V FEATURE CHARACTERISTICS Switching Frequency ON/OFF Control Logic High Logic Low GENERAL SPECIFICATIONS MTBF Weight DS_NC12S20A_12092010 With appropriate air flow and derating, see Fig. 33 With appropriate air flow and derating, see Fig. 39 Typ. 0 -40 -40 Non-isolated Max. Units 14 130 125 125 Vdc °C °C °C V 13.8 V NA 10.2 12 9.0 7.5 1.5 100% Load, 10.2Vin, 5Vout Vin=12V, Vout=0.9V Remote OFF Refer to Figure 31. 120 Hz With a 1.0% trim resistors Io=Io,min to Io,max (excluding soldered pins) Vin=Vin,min to Vin,max 5Hz to 20MHz bandwidth Full Load, 100nF ceramic, 10µF tantalum Full Load, 100nF ceramic, 10µF tantalum Vin=12V, Turn ON Vin=12V, Turn OFF Hiccup mode Hiccup mode 10.65 68 8 180 45 0.9 -3.0 5.0 +3.0 V % -1.3 -0.2 +1.3 +0.2 % % 0 50 20 20 1 100 mV mV A % mV A 21 12Vin, 10µF Tan & 1µF Ceramic load cap, 10A/µs 50% Io,max to 75% Io,max 75% Io,max to 50% Io,max Settling to be within regulation band (Vo +/- 3%) From Enable high to 10% of Vo From Vin=12V to 10% of Vo EX: Al-Polymer PSA series (6.3V/680µF, ESR 7 mΩ max) Full load Ex: OSCON (16V/270µF, ESR 18 mΩ max.) V V V A mA mA mA dB 100 100 200 mV mV µs 10 10 ms ms 11560 µF µF 680 270 Vin=12V, Io=20A Vin=12V, Io=20A Vin=12V, Io=20A Vin=12V, Io=20A Vin=12V, Io=20A Vin=12V, Io=20A 75 78 84 86 88 91 % % % % % % Fixed Positive logic (internally pulled high) Module On (or leave the pin open) Module Off 200 KHz Telcordia SR-332 Issue1 Method1 Case3 at 50°C 2.4 0 5.5 0.8 1.28 16.5 V V M hours grams 2 90 100 80 90 70 80 Efficiency (%) Efficiency (%) ELECTRICAL CHARACTERISTICS CURVES 60 50 40 30 20 10.2 10 12 70 60 50 40 30 20 13.8 10.2 10 0 1 3 4 5 7 8 9 11 12 13 15 16 17 19 20 0 1 3 4 5 Output Current (A) 90 80 80 70 70 Efficiency (%) 100 90 60 50 40 30 10.2 10 12 8 9 11 12 13 15 16 17 19 20 Figure 2: Converter efficiency vs. output current (1.2V output voltage) 100 20 7 Output Current (A) Figure 1: Converter efficiency vs. output current (0.9V output voltage) Efficiency (%) 13.8 0 0 60 50 40 30 20 13.8 10.2 10 0 12 13.8 0 0 1 3 4 5 7 8 9 11 12 13 15 16 17 19 20 0 1 3 4 5 Output Current (A) 90 80 80 70 70 Efficiency (%) 100 90 60 50 40 30 10.2 10 12 8 9 11 12 13 15 16 17 19 20 Figure 4: Converter efficiency vs. output current (2.5V output voltage) 100 20 7 Output Current (A) Figure 3: Converter efficiency vs. output current (1.8V output voltage) Efficiency (%) 12 13.8 0 60 50 40 30 20 10.2 10 12 13.8 0 0 1 3 4 5 7 8 9 11 12 13 15 16 17 19 20 Output Current (A) Figure 5: Converter efficiency vs. output current (3.3V output voltage) DS_NC12S20A_12092010 0 1 3 4 5 7 8 9 11 12 13 15 16 17 19 20 Output Current (A) Figure 6: Converter efficiency vs. output current (5.0V output voltage) 3 ELECTRICAL CHARACTERISTICS CURVES (CON.) Figure 7: Output ripple & noise at 12Vin, 0.9V/20A out Figure 8: Output ripple & noise at 12Vin, 1.2V/20A out Figure 9: Output ripple & noise at 12Vin, 1.8V/20A out Figure 10: Output ripple & noise at 12Vin, 2.5V/20A out Figure 11: Output ripple & noise at 12Vin, 3.3V/20A out Figure 12: Output ripple & noise at 12Vin, 5.0V/20A out DS_NC12S20A_12092010 4 ELECTRICAL CHARACTERISTICS CURVES (CON.) Figure 13: Turn on delay time at 12Vin, 0.9V/20A out Ch2:Vin Ch3:Vout Ch4:PWRGD Figure 14: Turn on delay time Remote On/Off, 0.9V/20A out Ch2:ENABLE Ch3:Vout Ch4:PWRGD Figure 15: Turn on delay time at 12Vin, 2.5V/20A out Ch2:Vin Ch3:Vout Ch4:PWRGD Figure 16: Turn on delay time at Remote On/Off, 2.5V/20A out Ch2: ENABLE Ch3:Vout Ch4:PWRGD Figure 17: Turn on delay time at 12Vin, 5.0V/20A out Ch2:Vin Ch3:Vout Ch4:PWRGD Figure 18: Turn on delay time at Remote On/Off, 5.0V/20A out Ch2: ENABLE Ch3:Vout Ch4:PWRGD DS_NC12S20A_12092010 5 ELECTRICAL CHARACTERISTICS CURVES (CON.) Figure 19: Typical transient response to step load change at 10A/µS from 50% to 75% and 75% to 50% of Io_max at 12Vin, 0.9V out Figure 20: Typical transient response to step load change at 10A/µS from 50% to 75% and 75% to 50% of Io_max at 12Vin, 1.2V out Figure 21: Typical transient response to step load change at 10A/µS from 50% to 75% and 75% to 50% of Io_max at 12Vin, 2.5V out Figure 22: Typical transient response to step load change at 10A/µS from 50% to 75% and 75% to 50% of Io_max at 12Vin, 5.0V out DS_NC12S20A_12092010 6 DESIGN CONSIDERATIONS The NC20A is a single phase and voltage mode controlled Buck topology. Block diagram of the converter is shown in Figure 23. The output can be trimmed in the range of 0.9Vdc to 5.0Vdc by a resistor from Trim pin to Ground. The converter can be turned ON/OFF by remote control. Positive on/off (ENABLE pin) logic implies that the converter DC output is enabled when this signal is driven high (greater than 2.4V) or floating and disabled when the signal is driven low (below 0.8V). Negative on/off logic is optional and could also be ordered. The converter provides an open collector signal called Power Good. The power good signal is pulled low when output is not within ±10% of Vout or Enable is OFF. The converter can protect itself by entering hiccup mode against over current and short circuit condition. Also, the converter will shut down when an over voltage protection is detected. FEATURES DESCRIPTIONS ENABLE (On/Off) The ENABLE (on/off) input allows external circuitry to put the NC converter into a low power dissipation (sleep) mode. Positive (active-high) ENABLE is available as standard. Positive ENABLE (active-high) units of the NC series are turned on if the ENABLE pin is high or floating. Pulling the pin low will turn off the unit. With the active high function, the output is guaranteed to turn on if the ENABLE pin is driven above 2.4V. The output will turn off if the ENABLE pin voltage is pulled below .8V. The ENABLE input can be driven in a variety of ways as shown in Figures 24, 25 and 26. If the ENABLE signal comes from the primary side of the circuit, the ENABLE can be driven through either a bipolar signal transistor (Fig. 24) or a logic gate (Fig. 25). If the enable signal comes from the secondary side, then an opto-coupler or other isolation devices must be used to bring the signal across the voltage isolation (please see Figure 26). NC6A/15A/20A Vin Figure 23: Block Diagram It is recommended that the user to provide a very fast-acting type fuse in the input line for safety. The output voltage set-point and the output current in the application could define the current rating of the fuse. Enable Trim Ground Ground Figure 24: Enable Input drive circuit for NC series 5V Safety Considerations Vout NC6A/15A/20A Vin Vout Enable Trim Ground Ground Figure 25: Enable input drive circuit using logic gate. NC6A/15A/20A Vin Enable Ground Vout Trim Ground Figure 26: Enable input drive circuit example with isolation. DS_NC12S20A_12092010 7 The NC15A/20A module has a trim range of 0.9V to 5.0V. The trim resistor equation for the NC6A/NC15A/ NC20A is : FEATURES DESCRIPTIONS Input Under-Voltage Lockout The input under-voltage lockout prevents the converter from being damaged while operating when the input voltage is too low. The lockout occurs between 7.0V to 8.0V. Over-Current and Short-Circuit Protection The NC series modules have non-latching over-current and short-circuit protection circuitry. When over current condition occurs, the module goes into the non-latching hiccup mode. When the over-current condition is removed, the module will resume normal operation. An over current condition is detected by measuring the voltage drop across the high-side MOSFET. The voltage drop across the MOSFET is also a function of the MOSFET’s Rds(on). Rds(on) is affected by temperature, therefore ambient temperature will affect the current limit inception point. Please see the electrical characteristics for details of the OCP function. Rs(Ω) = 1170 Vout − 0.9 Vout is the output voltage setpoint Rs is the resistance between Trim and Ground Rs values should not be less than 280Ω Output Voltage Rs (Ω) +0.9 V +1.2 V +1.5 V +1.8 V +2.5 V +3.3 V +5.0 V OPEN 3.92K 1.96K 1.3K 732 487 287 Figure 28: Typical trim resistor values NC6A/15A/20A Vout Vin The detection of the Rds(on) of the high side MOSFET also acts as an over temperature protection since high temperature will cause the Rds(on) of the MOSFET to increase, eventually triggering over-current protection. 1.3K Enable Rt Vt Rs Ground Output Voltage Programming The output voltage of the NC series is trimmable by connecting an external resistor between the trim pin and output ground as shown Figure 27 and the typical trim resistor values are shown in Figure 28. The output can also be set by an external voltage connected to trim pin as shown in Figure 29. Trim Ground Figure 29: Output voltage trim with voltage source To use voltage trim, the trim equation for the NC6A/NC15A/ NC20A is (please refer to Fig. 29) : Rt (kΩ) = Rs(1.3Vt − 1.17) 1.17 − Rs(Vout − 0.9) NC6A/15A/20A Vout is the desired output voltage Vt is the external trim voltage Rs is the resistance between Trim and Ground (in KΩ) Rt is the resistor to be defined with the trim voltage (in KΩ) Vout Vin Trim Enable Rs Ground Ground Figure 27: Trimming Output Voltage Below is an example about using this voltage trim equation : Example： If Vt = 1.25V, desired Vout = 2.5V and Rs = 0.715KΩ Rt ( KΩ) = DS_NC12S20A_12092010 Rs (1.3Vt − 1.17) = 12.51KΩ 1.17 − Rs (Vout − 0.9) 8 FEATURES DESCRIPTIONS Output Capacitance Power Good There is no output capacitor on the NC series modules. Hence, an external output capacitor is required for stable operation. For NC20 modules, an external 6.3V/680µF low ESR capacitor (for example, OSCON Al-Polymer PSA series) is required for stable operation. The converter provides an open collector signal called Power Good. This output pin uses positive logic and is open collector. This power good output is able to sink 5mA and set high when the output is within ±10% of output set point. The power good signal is pulled low when output is not within ±10% of Vout or Enable is OFF. Current Sink Capability The NC series converters are able to sink current as well as function as a current source. It is able to sink the full output current at any output voltage up to and including 2.5V. This feature allows the NC series fit into any voltage termination application. Voltage Margining Adjustment Output voltage margin adjusting can be implemented in the NC modules by connecting a resistor, Rmargin-up, from the Trim pin to the Ground for margining up the output voltage. Also, the output voltage can be adjusted lower by connecting a resistor, Rmargin-down, from the Trim pin to the voltage source Vt. Figure 30 shows the circuit configuration for output voltage margining adjustment. It is important to places these low ESR capacitors as close to the load as possible in order to get improved dynamic response and better voltage regulation, especially when the load current is large. Several of these low ESR capacitors could be used together to further lower the ESR. Please refer to individual datasheet for the maximum allowed start-up load capacitance for each NC series as it is varied between series. Reflected Ripple Current and Output Ripple and Noise Measurement The measurement set-up outlined in Figure 31 has been used for both input reflected/ terminal ripple current and output voltage ripple and noise measurements on NC series converters. Vt NC6A/15A/20A Vin Enable Vout Rmargin-down Trim Rmargin-up Rs Ground Ground Figure 30: Circuit configuration for output voltage margining Cs=270µF*1, Ltest=1.4µH, Cin=270µF*1, Cout=680µF *1 Figure 31: Input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for NC20 Paralleling NC06/NC15/NC20 converters do not have built-in current sharing (paralleling) ability. Hence, paralleling of multiple NC06/NC15/NC20 converters is not recommended. DS_NC12S20A_12092010 9 THERMAL CONSIDERATION Thermal management is an important part of the system design. To ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the module. Convection cooling is usually the dominant mode of heat transfer. Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. Thermal Testing Setup Delta’s DC/DC power modules are characterized in heated vertical wind tunnels that simulate the thermal environments encountered in most electronics equipment. This type of equipment commonly uses vertically mounted circuit cards in cabinet racks in which the power modules are mounted. The following figure shows the wind tunnel characterization setup. The power module is mounted on a test PWB and is vertically positioned within the wind tunnel. The height of this fan duct is constantly kept at 25.4mm (1’’). Thermal Derating Heat can be removed by increasing airflow over the module. To enhance system reliability, the power module should always be operated below the maximum operating temperature. If the temperature exceeds the maximum module temperature, reliability of the unit may be affected. DS_NC12S20A_12092010 10 THERMAL CURVES (NC12S0A0V20) NC12S0A0V20 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =3.3V (Either Orientation) PWB FACING PWB Output Current (A) 20 MODULE 16 AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE Natural Convection 12 100LFM 200LFM 8 300LFM 50.8 (2.0”) 400LFM 500LFM AIR FLOW 4 17.5 (0.69”) 35 (1.38”) Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches) Figure 32: Wind tunnel test setup 600LFM 0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 35: Output current vs. ambient temperature and air velocity@ Vout=3.3V(Either Orientation) NC12S0A0V20 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =1.8V (Either Orientation) Output Current (A) 20 16 Natural Convection 12 100LFM 200LFM 8 300LFM 400LFM 500LFM 4 600LFM 0 25 Figure 33: Temperature measurement location * The allowed maximum hot spot temperature is defined at 130℃ NC12S0A0V20 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =5V (Either Orientation) 16 16 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Natural Convection 12 100LFM 100LFM 200LFM 200LFM 8 300LFM 300LFM 400LFM 400LFM 500LFM 4 45 NC12S0A0V20 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =0.9V (Either Orientation) 20 8 40 Output Current (A) 20 Natural Convection 35 Figure 36: Output current vs. ambient temperature and air velocity@ Vout=1.8V(Either Orientation) Output Current (A) 12 30 500LFM 4 600LFM 0 0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 34: Output current vs. ambient temperature and air DS_NC12S20A_12092010 velocity@Vout=5V(Either Orientation) 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 37: Output current vs. ambient temperature and air velocity@ Vout=0.9V(Either Orientation) 11 THERMAL CURVES (NC12S0A0H20) NC12S0A0H20 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =3.3V (Either Orientation) Output Current (A) PWB FACING PWB 20 MODULE 16 Natural Convection 12 AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE 100LFM 200LFM 8 300LFM 50.8 (2.0”) 400LFM AIR FLOW 500LFM 4 600LFM 0 9.5 (0.37”) 19 (0.75”) 25 Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches) Figure 38: Wind tunnel test setup 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 41: Output current vs. ambient temperature and air velocity@ Vout=3.3V(Either Orientation) NC12S0A0H20 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =1.8V (Either Orientation) Output Current (A) 20 16 Natural Convection 12 100LFM 200LFM 8 300LFM 400LFM 500LFM 4 0 25 Figure 39: Temperature measurement location * The allowed maximum hot spot temperature is defined at 125℃ NC12S0A0H20 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =5V (Either Orientation) 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) NC12S0A0H20 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =0.9V (Either Orientation) 20 16 16 Natural Convection 12 100LFM 100LFM 200LFM 8 40 Output Current (A) 20 Natural Convection 35 Figure 42: Output current vs. ambient temperature and air velocity@ Vout=1.8V(Either Orientation) Output Current (A) 12 30 200LFM 8 300LFM 300LFM 400LFM 400LFM 500LFM 4 4 600LFM 0 0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 40: Output current vs. ambient temperature and air velocity @Vout=5V(Either Orientation) DS_NC12S20A_12092010 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 43: Output current vs. ambient temperature and air velocity@ Vout=0.9V(Either Orientation) 12 MECHANICAL DRAWING VERTICAL DS_NC12S20A_12092010 HORIZONTAL 13 PART NUMBERING SYSTEM NC Product Series 12 S Input Number of Voltage outputs NC12S- Single Non-isolated 10.2~13.8V output Converter V 0A0 Output Voltage P N ON/OFF Logic Pin Length 20 Output Mounting Current 0A0H- Horizontal 20- 20A programmable V- Vertical P- Positive N- 0.14” N- Negative R- 0.118” F A Option Code F- RoHS 6/6 (Lead Free) A- Standard Function MODEL LIST Model Name Packaging Input Voltage Output Voltage Output Current Efficiency 12Vin @ 100% load NC12S0A0V20PNFA Vertical 10.2 ~ 13.8Vdc 0.9 V ~ 5.0Vdc 20A 91% (5.0V) NC12S0A0H20PNFA Horizontal 10.2 ~ 13.8Vdc 0.9 V ~ 5.0Vdc 20A 91% (5.0V) CONTACT: www.delta.com.tw/dcdc USA: Telephone: East Coast: (888) 335 8201 West Coast: (888) 335 8208 Fax: (978) 656 3964 Email: [email protected] Europe: Telephone: +41 31 998 53 11 Fax: +41 31 998 53 53 Email: [email protected] Asia & the rest of world: Telephone: +886 3 4526107 x6220 Fax: +886 3 4513485 Email: [email protected] WARRANTY Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon request from Delta. Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications at any time, without notice. DS_NC12S20A_12092010 14