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FEATURES
High Efficiency: 95% @ 12Vin, 5V/60A out 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 OTP, OCP, SCP Remote ON/OFF (default: positive) ISO 9001, TL 9000, ISO 14001, QS9000, OHSAS 18001 certified manufacturing facility UL/cUL 60950 (US & Canada) Recognized, and TUV (EN60950) Certified CE mark meets 73/23/EEC and 93/68/EEC directives
Delphi NC Series Non-Isolated Point of Load DC/DC Power Modules: 12Vin, 0.9V-5Vout, 60A
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OPTIONS
The Delphi NC 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. This product family provides up to 60A of power in a vertical or horizontal mounted through-hole package. The NC12S0A0V60 will provide up to 60A of output current 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.
Negative On/Off logic
APPLICATIONS
DataCom Distributed power architectures Servers and workstations LAN/WAN applications Data processing applications
DATASHEET DS_NC12S60A_02072007
TECHNICAL SPECIFICATIONS (T =25C, airflow rate=400LFM, V
A
in
=12Vdc, nominal Vout unless otherwise noted)
PARAMETER
ABSOLUTE MAXIMUM RATINGS Input Voltage Operating Temperature 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 Short-Circuit Input Current 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 DYNAMIC CHARACTERISTICS Out 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 Minimum Output Startup Capacitive Load Maximum Output Startup Capacitive 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 Remote Sense Range GENERAL SPECIFICATIONS Calculated MTBF Weight Over-Temperature Shutdown
NOTES and CONDITIONS
Min. 0 -40
NC12S0A0V60
Typ. Max. 12.6 50 125 NA 11.04 12 9.4 8.3 1.1 12.6 Units Vdc C C V V V V V A mA mA mA dB A V % % % mV mV A % mV A
Refer to Figure 36 for the measuring point Non-isolated
100% Load, 11.04Vin, 5Vout 250 40 150 45
32
Refer to Figure 35 120 Hz
1 0.9 -3.0 -1.5 -0.2 5.0 +3.0 +1.5 +0.2 50 15 60 1 100 94 12Vin, 10F Tan & 1F Ceramic load cap, 10A/s 50% Io,max to 75% Io,max 75% Io,max to 50% Io,max Settling to be within regulation band (+/- 3.0%) Io=Io.max Vin=12V, Vo=10% of Vo,set Vo=10% of Vo,set Ex: Four OSCON 6.3V/680F (ESR 13m max each) Full load Ex: Three OSCON 16V/270F (ESR 18m max each) Vin=12V, Io=60A Vin=12V, Io=60A Vin=12V, Io=60A Vin=12V, Io=60A Vin=12V, Io=60A Vin=12V, Io=60A Vin=12V, Io=60A
Vin=12V, Io=Io,max, 1% trim resistors Io=Io,min to Io,max Vin=Vin,min to Vin,max 5Hz to 20MHz bandwidth Full Load, 0.1F ceramic, 10F tantalum Full Load, 0.1F ceramic, 10F tantalum Vin=12V, Turn ON Vin=12V, Turn OFF
0
75 75
100 100 150 10 30
mV mV s ms ms F F F % % % % % % % KHz
2720 8160 810 83 86 88 90 92 93 95 300
Positive logic (internally pulled high) Module On (or leave the pin open) Module Off
2.4 0
5.5 0.8 400 1.29 37 130
V V mV M hours grams C
Telcordia SR-332 Issue1 Method1 Case3 at 50 Refer to Figure 36 for the measuring point
DS_NC12S60A_02072007
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ELECTRICAL CHARACTERISTICS CURVES
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Vin = 11.04V Vin = 12.0V Vin = 12.6V
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Vin = 11.04V Vin = 12.0V Vin = 12.6V
Efficiency (%)
Efficiency (%)
Output Current (A)
Figure 1: Converter efficiency vs. output current (0.9V output voltage)
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Vin = 11.04V Vin = 12.0V Vin = 12.6V
Output Current (A)
Figure 2: Converter efficiency vs. output current (1.2V output voltage)
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Vin = 11.04V Vin = 12.0V Vin = 12.6V
Efficiency (%)
Efficiency (%)
Output Current (A)
Figure 3: Converter efficiency vs. output current (1.5V output voltage)
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Vin = 11.04V Vin = 12.0V Vin = 12.6V
Output Current (A)
Figure 4: Converter efficiency vs. output current (1.8V output voltage)
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Vin = 11.04V Vin = 12.0V Vin = 12.6V
Efficiency (%)
Efficiency (%)
Output Current (A)
Figure 5: Converter efficiency vs. output current (2.5V output voltage)
Output Current (A)
Figure 6: Converter efficiency vs. output current (3.3V output voltage)
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ELECTRICAL CHARACTERISTICS CURVES (CON.)
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Vin = 11.04V Vin = 12.0V Vin = 12.6V
Efficiency (%)
Output Current (A)
Figure 7: Converter efficiency vs. output current (5V output voltage) Figure 8: Output ripple & noise at 12Vin, 0.9V/60A out
Figure 9: Output ripple & noise at 12Vin, 1.2V/60A out
Figure 10: Output ripple & noise at 12Vin, 1.5V/60A out
Figure 11: Output ripple & noise at 12Vin, 1.8V/60A out
Figure 12: Output ripple & noise at 12Vin, 2.5V/60A out
DS_NC12S60A_02072007
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ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 13: Output ripple & noise at 12Vin, 3.3V/60A out
Figure 14: Output ripple & noise at 12Vin, 5V/60A out
Figure 15: Turn on delay time at 12Vin, 0.9V/60A out Ch1:OUTEN Ch2:Vout Ch3:PWRGD
Figure 16: Turn on delay time Remote On/Off, 1.2V/60A out Ch1:OUTEN Ch2:Vout Ch3:PWRGD
Figure 17: Turn on delay time at 12Vin, 3.3V/60A out Ch1:OUTEN Ch2:Vout Ch3:PWRGD
Figure 18: Turn on delay time Remote On/Off, 5V/60A out Ch1:OUTEN Ch2:Vout Ch3:PWRGD
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ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 19: Typical transient response to step load change at 10A/S from 50% to 75% and 75% to 50% of Io, max at 12Vin, 1.2V out
Figure 20: Typical transient response to step load change at 10A/S from 50% to 75% and 75% to 50% of Io, max at 12Vin, 1.5V out
Figure 21: Typical transient response to step load change at 10A/S from 50% to 75% and 75% to 50% of Io, max at 12Vin, 1.8V out
Figure 22: Typical transient response to step load change at 10A/S from 50% to 75% and 75% to 50% of Io, max at 12Vin, 2.5V out
Figure 23: Typical transient response to step load change at 10A/S from 50% to 75% and 75% to 50% of Io, max at 12Vin, 3.3V out
Figure 24: Typical transient response to step load change at 10A/S from 50% to 75% and 75% to 50% of Io, max at 12Vin, 5.0V out
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DESIGN CONSIDERATIONS
The NC60A is designed using three-phase synchronous buck topology. Block diagram of the converter is shown in Figure 25. The output can be trimmed in the range of 0.9V to 5.0V by a resistor from trim pin to ground. The remote sense is able to compensate for a drop from the output of converter to point of load. The converter can be turned on/off by remote control. Positive OUTEN logic implies that the converter DC output is enabled when this signal is driven high (greater than 2.4V) or floating and disabled when low (below 0.8V). Negative OUTEN logic is an option. The converter provides an open collector signal, Power Good. The power good signal is pulled low when output is not within 10% of Vout or when Enable is off. The converter can protect itself into hiccup mode against over current and short circuit condition. Also, the converter will shut down due to over voltage protection is detected. The converter has an over temperature protection which can protect itself by shutting down for an over temperature event. There is a thermal hysteresis of typically 25
FEATURES DESCRIPTIONS
Remote On/Off
The remote ON/OFF input allows external circuitry to put the NC converter into a sleep mode. Active-high remote on/off is available as standard. Active-high units of the NC series are turned on if the remote ON/OFF pin is high (or floating). Pulling the pin low will turn off the unit. To guarantee turn-on the enable voltage must be above 2.4V and to turn off the enable voltage must be pulled below 0.8V The remote ON/OFF input can be driven in a variety of ways as shown in Figures 26, 27, and 28. If the remote ON/OFF signal originates on the primary side, the remote ON/OFF input can be driven through a discrete device (e.g. a bipolar signal transistor) or directly from a logic gate output. The output of the logic gate may be an open-collector (or open-drain) device. If the drive signal originates from the opposite of an isolated side, the remote ON/OFF input can be isolated and driven through an opto-coupler.
o o
VIN
Vo
TRIM
GROUND
OUTEN
GROUND
o o o
Safety Considerations
It is recommended to add a fuse at input line. As to current rating of the fuse, it depends on the output voltage and current setting.
Figure26: Remote ON/OFF Input Drive Circuit for Non-Isolated Bipolar
5V
o o
VIN
Vo
TRIM
GROUND
OUTEN
GROUND
o o o
Figure 27: Remote ON/OFF Input Drive Circuit for Logic Driver
Figure 25: Block Diagram
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FEATURES DESCRIPTIONS (CON.)
Under Voltage Lockout
The undervoltage lockout prevents the converter from operating when the input voltage is too low. The lockout occurs between 8.3V to 9.4V. This allows more flexibility in designing and ensures operation on supply lines with large tolerances
o o
VIN
GROUND OUTEN
Vo
TRIM GROUND
o o o
Over Current and Short-Circuit Protection
Figure 28: Remote ON/OFF Input Drive Circuit
Remote Sense
Remote sense compensates for voltage drops on the output by sensing the actual output voltage at the point of load. The module will compensate for a maximum drop of 400mV. The remote sense connects as shown in Figures 29. This limit includes any increase in voltage due to remote sense compensation and output voltage set point adjustment (trim).
When over current condition occurs, the converter enters hiccup mode. Ambient temperature influences the current limit inception point since resistance of MOSFET rises with temperature. The unit will not be damaged in an over current condition because it will be protected by the over temperature protection.
Over Temperature Protection (OTP)
The over temperature protection is non-latching and a temperature sensor monitors the temperature of the PCB near one the main MOSFETS. If temperature exceeds a threshold of 130(typ.) the converter will shut down. When the substrate temperature has decreased by 25 the converter will automatically restart.
o o
VIN
Vo +SENSE
Over Voltage Protection (OVP)
The converter will shut down when an output over voltage is detected. Once the OVP condition is detected, the controller will stop all PWM outputs and will turn on low-side MOSFET driver to prevent any damage to load.
Contact and Distribution Losses
GROUND
-SENSE GROUND
Current Sharing (optional)
Figure 29: Effective circuit configuration for remote sense operation
The parallel operation of multiple converters is available with the NC60 (option code B). The converter will share to be within +/ - 10% of load. Note the remote sense lines of the parallel units must be connected at the same point for proper operation in addition to the current share pins being connected. Also, units are intended to be turned on/enabled at the same time. Hot plugging is not recommended. The current share diagram show in Figure 30.
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FEATURES DESCRIPTIONS (CON.)
NC60A Vout +SENSE -SENSE GROUND I-SHARE TRIM NC60A
0
The resistor trim equation for the NC is as follows: Rset (k) =
12.69 - Vout Vout - 0.9
Cout
Where, Vout is the required voltage setpoint Rest is the resistance required between TRIM and Ground Rest values should not be less than 1.8 k
LOAD
Output Voltage +0.9 V Rs() tol OPEN 38.3K 18.7K 12.1K 6.34K 3.92K 1.87K
Vout +SENSE -SENSE GROUND I-SHARE TRIM
Cout
+1.2 V +1.5 V +1.8 V +2.5 V +3.3 V +5 V
Figure 30: NC60A Current Share Diagram
Figure 32: Typical Trim Resistor Values The voltage trim equation with example is as follows
Output Voltage Programming
The output on the module is trimmable by connecting an external resistor between the TRIM pin (PIN1) and ground as per Figure31 and the typical trim values are shown in Figure 32. The NC60A module has a trim range of 0.9V to 5.0V. A plot of trim behavior is shown in Figure 33
Example Set Vt = 1.25V Vt = 1.25V
Vout = 2.5V
Rs = 1 k
Rt =
Rs (13 . 1Vt + Vout - 12 . 69 0 . 9 Rs - VoutRs - Vout + 12 . 69
Rt = 0.72 k
+SENSE Vout Cout GROUND -SENSE Rs TRIM
Figure 31: Trimming Output Voltage
+SENSE Vout Cout GROUND -SENSE Rs TRIM Rt Vt
Figure 33: Trim Output Voltage - with Voltage Source
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Voltage Margin Adjusting
Output voltage margin adjusting can be implemented in the NC60A modules by connecting a resistor, R margin-up, from the Trim pin to the ground pin for adjusting voltage a little bit higher. Also, the output voltage can be adjusted lower by connecting a resistor, Rmargin-down, from the Trim pin to the output pin. Figure 34 shows the circuit configuration for output voltage margin adjusting.
Vt
+SENSE Vout
Rmargin-down
THERMAL CONSIDERATION
The electrical operating conditions of the NC, namely: Input voltage, Vin Output voltage, Vo Output current, Io

Determine how much power is dissipated within the converter. The following parameters further influence the thermal stresses experienced by the converter: Ambient temperature Air velocity Thermal efficiency of the end system application Parts mounted on system PCB that may block airflow Real airflow characteristics at the converter location

Cout
GROUND -SENSE Rs
TRIM
Rmargin-up
0
Figure 34: Circuit configuration for output voltage margining
Output Capacitance
An external output capacitor is required for stable operation.
Reflected Ripple Current and Output Ripple and Noise Measurement
The measurement set-up outlined in Test Configuration Figure 35 have been used for both input reflected/terminal ripple current and output voltage ripple and noise measurements on NC series converters.
Input reflected current measurement point
Vin+
1
In order to simplify the thermal design, a number of thermal de-rating plots are provided. These de-rating graphs show the load current of the NC versus the ambient air temperature and air flow. However, since the thermal performance is heavily dependent upon the final system application, the user needs to ensure the thermal reference point temperatures are kept within the recommended temperature rating. It is recommended that the thermal reference point temperatures are measured using a thermocouple or an IR camera. In order to comply with stringent Delta de-rating criteria, the ambient temperature should never exceed 85. Please contact Delta for further support.. The maximum acceptable temperature measured at the thermal reference point is 127. This is shown in Figure 36.
FACING PWB PWB
Ltest
2
LOAD
DC-DC Converter Cs Cin Cout
100nF Ceramic 10uF Tantalum
MODULE
Output voltage ripple noise measurement point
Cs=270uF*1 Ltest=1.4uH Cin=270uF*3 Cout=680uF*4
Figure 35:Input Reflected Ripple/Capacitor Ripple Current and Output Voltage Ripple and Noise Measurement Set-Up for NC60A
AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE
AIR FLOW
50.8 (2.0")
19 (0.75") 38 (1.5")
Note: Wind Tunnel Test Setup
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THERMAL CURVES (NC12S0A0V60)
Output Current (A)
NC12S0A0V60 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =1.8V (Either Orientation)
60
50
40
Natural Convection 100LFM
30
200LFM 300LFM
20
400LFM 500LFM
10
600LFM
0 25 35 45 55 65 75 85 Ambient Temperature ()
Figure 36: Temperature measurement location * The allowed maximum hot spot temperature is defined at 127
NC12S0A0V60 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =5V (Either Orientation)
Figure 39: Output current vs. ambient temperature and air velocity@ Vout=1.8V(Either Orientation)
Output Current (A)
Output Current (A)
NC12S0A0V60 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =0.9V (Either Orientation)
60
60
50
50
40
Natural Convection 100LFM
40
Natural Convection 100LFM
30
30
200LFM 300LFM
20 20
200LFM 300LFM 400LFM 500LFM
10
400LFM 500LFM
10
600LFM
0 25 35 45 55 65 75 85 Ambient Temperature ()
0 25 35 45 55 65 75 85 Ambient Temperature ()
Figure 37: Output current vs. ambient temperature and air velocity@ Vout=5V(Either Orientation)
Output Current (A)
Figure 40: Output current vs. ambient temperature and air velocity@ Vout=0.9V(Either Orientation)
NC12S0A0V60 (Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vout =3.3V (Either Orientation)
60
50
40
Natural Convection 100LFM
30
200LFM 300LFM
20
400LFM 500LFM
10
600LFM
0 25 35 45 55 65 75 85 Ambient Temperature ()
Figure 38: Output current vs. ambient temperature and air hvelocity@ Vout=3.3V(Either Orientation)
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MECHANICAL DRAWING
VERTICAL
DS_NC12S60A_02072007
12
PART NUMBERING SYSTEM
NC
Product Series
NCConverter
12
Input Voltage
12-
S
Number of outputs
S- Single output
0A0
Output Voltage
0A0programmable
V
Mounting
V- Vertical
60
Output Current
60- 60A
P
ON/OFF Logic
N
Pin Length
F
A
Option Code
P- Positive R- 0.118" N- Negative N- 0.140"
F- RoHS 6/6 (Lead Free)
A- Standard Functions
Non-isolated 11.04~12.6V
MODEL LIST
Model Name
NC12S0A0V60PNFA
Packaging
Vertical
Input Voltage
11.04~12.6Vdc
Output Voltage
0.9 V~ 5.0Vdc
Output Current
60A
Efficiency 12Vin @ 100% load
95% (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: DCDC@delta-corp.com Europe: Telephone: +41 31 998 53 11 Fax: +41 31 998 53 53 Email: DCDC@delta-es.tw Asia & the rest of world: Telephone: +886 3 4526107 x6220 Fax: +886 3 4513485 Email: DCDC@delta.com.tw
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.
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