FEATURES High Efficiency: 91% @ 12Vin, 5V/15A 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 9000, TL 9000, ISO 14001 certified manufacturing facility UL/cUL 60950-1 (US & Canada) Recognized, and TUV (EN60950-1) Certified Delphi NC15 Series Non-Isolated Point of Load DC/DC Power Modules: 12Vin, 0.9V-5.0Vout, 15A The Delphi NC15 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. The NC15 series operates from a 12V nominal input, provides up to 15A 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. CE mark meets 73/23/EEC and 93/68/EEC directives OPTIONS Vertical or horizontal versions Negative ON/OFF logic APPLICATIONS DataCom Distributed power architectures Servers and workstations LAN / WAN applications Data processing applications DATASHEET DS_NC12S15A_01102008 TECHNICAL SPECIFICATIONS (Ambient Temperature=25°C, minimum airflow=200LFM, nominal Vin=12Vdc unless otherwise specified.) PARAMETER NOTES and CONDITIONS NC12S0A0V/H15 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 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 Output Dynamic Load Response Positive Step Change in Output Current Negative Step Change in Output Current Settling Time Turn-On Transient Start-Up Time, from On/Off Control Start-Up Time, from input power Minimum Output Capacitance Maximum Output Startup Capacive Load Minimum Input Capacitance EFFICIENCY Vo=0.9V Vo=1.2V Vo=1.5V 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 NC12S15A_01102008 With appropriate air flow and derating, see Figs 33 With appropriate air flow and derating, see Figs 39 Typ. 0 0 -40 Non-isolated Max. Units 14 130 125 125 Vdc °C °C °C V 13.8 V NA 10.2 12.0 9.0 7.5 1.5 100% Load, 10.2Vin, 5.0Vout Vin=12V, Vout=0.9V Remote OFF Refer to Figure 31. 120Hz With a 1.0% trim resistor Io=Io_min to Io_max 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 8.1 65 9 150 45 0.9 -2.5 5.0 +2.5 V % -1.0 -0.2 +1.0 +0.2 % % 0 50 20 15 1 100 mV mV A % mV A 100 100 200 mV mV µs 10 10 ms ms µF µF µF 16 12Vin, 100nF ceramic, 10µF tantalum 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 +/- 2.5%) From Enable high to 10% of Vo From Vin=12V to 10% of Vo Ex: OSCON 6.3V/680µF (ESR 13 mΩ max.) Full Load Ex: OSCON 16V/270µF (ESR 18 mΩ max.) V V V A mA mA mA dB 680 6800 270 Vin=12V, Io=15A Vin=12V, Io=15A Vin=12V, Io=15A Vin=12V, Io=15A Vin=12V, Io=15A Vin=12V, Io=15A Vin=12V, Io=15A 75 79 81 84 87 89 91 % % % % % % % fixed Positive logic (internally pulled high) Module On (or leave the pin open) Module Off 300 KHz Telcordia SR-332 Issue1 Method1 Case3 at 50°C 2.4 0 5.5 0.8 2.1 16.5 V V M hours grams 2 90 90 80 80 70 70 60 60 Efficiency (%) Efficiency (%) ELECTRICAL CHARACTERISTICS CURVES 50 40 30 20 50 40 30 20 10.2 10 12 13.8 10.2 10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 Output Current (A) 90 80 80 70 70 Efficiency (%) 100 90 60 50 40 30 10.2 10 12 6 7 8 9 10 11 12 13 14 15 Figure 2: Converter efficiency vs. output current (1.2V output voltage) 100 20 5 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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 Output Current (A) 90 80 80 70 70 Efficiency (%) 100 90 60 50 40 30 10.2 10 12 6 7 8 9 10 11 12 13 14 15 Figure 4: Converter efficiency vs. output current (2.5V output voltage) 100 20 5 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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Output Current (A) Figure 5: Converter efficiency vs. output current (3.3V output voltage) NC12S15A_01102008 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Output Current (A) Figure 6: Converter efficiency vs. output current (5.0V output voltage) 3 ELECTRICAL CHARACTERISTICS CURVES Figure 7: Output ripple & noise at 12Vin, 0.9V/15A out Figure 8: Output ripple & noise at 12Vin, 1.2V/15A out Figure 9: Output ripple & noise at 12Vin, 1.8V/15A out Figure 10: Output ripple & noise at 12Vin, 2.5V/15A out Figure 11: Output ripple & noise at 12Vin, 3.3V/15A out Figure 12: Output ripple & noise at 12Vin, 5.0V/15A out NC12S15A_01102008 4 ELECTRICAL CHARACTERISTICS CURVES Figure 13: Turn on delay time at 12Vin, 0.9V/15A out Ch2:Vin Ch3:Vout Ch4:PWRGD Figure 14: Turn on delay time Remote On/Off, 0.9V/15A out Ch2:ENABLE Ch3:Vout Ch4:PWRGD Figure 15: Turn on delay time at 12Vin, 2.5V/15A out Ch2:Vin Ch3:Vout Ch4:PWRGD Figure 16: Turn on delay time at Remote On/Off, 2.5V/15A out Ch2:ENABLE Ch3:Vout Ch4:PWRGD Figure 17: Turn on delay time at 12Vin, 5.0V/15A out Ch2:Vin Ch3:Vout Ch4:PWRGD Figure 18: Turn on delay time at Remote On/Off, 5.0V/15A out Ch2:ENABLE Ch3:Vout Ch4:PWRGD NC12S15A_01102008 5 ELECTRICAL CHARACTERISTICS CURVES 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 NC12S15A_01102008 6 DESIGN CONSIDERATIONS FEATURES DESCRIPTIONS The NC15 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. ENABLE (On/Off) 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. 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 (Figure 24) or a logic gate (Figure 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. NC12S15A_01102008 7 FEATURES DESCRIPTIONS (CON.) 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. The NC06/NC15/NC20 module has a trim range of 0.9V to 5.0V. The trim resistor equation for the NC6A/NC15A/ NC20A is : 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 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. Vin Output Voltage Programming Ground 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. 1.3K Enable Rt Trim Vt Rs 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 Vin Trim Enable Rs Ground Ground 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) Below is an example about using this voltage trim equation : Figure 27: Trimming Output Voltage Example： If Vt = 1.25V, desired Vout = 2.5V and Rs = 0.715KΩ Rt ( KΩ) = NC12S15A_01102008 Rs(1.3Vt − 1.17) = 12.51KΩ 1.17 − Rs(Vout − 0.9) 8 FEATURES DESCRIPTIONS (CON.) 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 NC15 modules, an external 6.3V/680μF low ESR capacitor (for example, OSCON) 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 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 Vout Vin Rmargin-down Trim Enable Rmargin-up Rs Ground Cs=270μF*1, Ltest=1.4μH, Cin=270μF*1, Cout=680μF *1 Ground Figure 30: Circuit configuration for output voltage margining Figure 31: Input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for NC15 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. NC12S15A_01102008 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 space between the neighboring PWB and the top of the power module is constantly kept at 6.35mm (0.25’’). 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. NC12S15A_01102008 10 THERMAL CURVES (NC12S0A0V15) NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout = 3.3V (Either Orientation) PWB FACING PWB Output Current(A) 15 MODULE 12 Natural Convection AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE 9 100LFM 200LFM 6 50.8 (2.0”) 300LFM 400LFM AIR FLOW 3 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 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) NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout = 1.8V (Either Orientation) Output Current(A) 15 12 Natural Convection 9 100LFM 200LFM 6 300LFM 3 0 25 Figure 33: Temperature measurement location * The allowed maximum hot spot temperature is defined at 130℃ 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 36: Output current vs. ambient temperature and air velocity@ Vout=1.8V(Either Orientation) NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout = 0.9V (Either Orientation) NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout = 5V (Either Orientation) Output Current(A) Output Current(A) 15 15 12 12 Natural Convection Natural Convection 9 9 100LFM 100LFM 200LFM 200LFM 6 6 300LFM 300LFM 400LFM 3 3 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 velocity@Vout=5V(Either Orientation) NC12S15A_01102008 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 (NC12S0A0H15) NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =3.3V (Either Orientation) PWB FACING PWB Output Current(A) 15 MODULE 12 Natural Convection 9 AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE 100LFM 200LFM 6 300LFM 50.8 (2.0”) AIR FLOW 3 0 25 9.5 (0.37”) 19 (0.75”) Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches) Figure 38: Wind tunnel test setup 35 45 55 65 75 85 Ambient Temperature (℃) Figure 41: Output current vs. ambient temperature and air velocity@ Vout=3.3V(Either Orientation) NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =1.8V (Either Orientation) Output Current(A) 15 12 Natural Convection 9 100LFM 200LFM 6 3 0 25 Figure 39: Temperature measurement location * The allowed maximum hot spot temperature is defined at 125℃ 35 45 55 65 75 85 Ambient Temperature (℃) Figure 42: Output current vs. ambient temperature and air velocity@ Vout=1.8V(Either Orientation) NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =0.9V (Either Orientation) NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =5V (Either Orientation) Output Current(A) Output Current(A) 15 15 12 12 Natural Convection 9 Natural Convection 9 100LFM 100LFM 200LFM 200LFM 6 6 300LFM 400LFM 3 3 0 0 25 35 45 55 65 75 85 Ambient Temperature (℃) Figure 40: Output current vs. ambient temperature and air velocity @Vout=5V(Either Orientation) NC12S15A_01102008 25 35 45 55 65 75 85 Ambient Temperature (℃) Figure 43: Output current vs. ambient temperature and air velocity@ Vout=0.9V(Either Orientation) 12 MECHANICAL DRAWING VERTICAL NC12S15A_01102008 HORIZONTAL 13 PART NUMBERING SYSTEM NC 12 S 0A0 V 15 P N Product Series Input Voltage Number of outputs Output Voltage Mounting Output Current ON/OFF Logic Pin Length NC- 12- Non-isolated 10.2~13.8V output S- Single 0A0- H- Horizontal 15 - 15A P- Positive programmable V- Vertical N- Negative N- 0.14” R- 0.118” F A Option Code F- RoHS 6/6 A- Standard (Lead Free) function. Converter MODEL LIST Model Name Packaging Input Voltage Output Voltage Output Current Efficiency 12Vin @ 100% load NC12S0A0V15PNFA Vertical 10.2 ~ 13.8Vdc 0.9 V ~ 5.0Vdc 15A 91% (5.0V) NC12S0A0H15PNFA Horizontal 10.2 ~ 13.8Vdc 0.9 V ~ 5.0Vdc 15A 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. NC12S15A_01102008 14