Delta Electronics Power Supply ND Series User Manual

FEATURES  
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High efficiency:  
92.5% @ 12Vin, 3.3V/50A out  
Size: 61.0x31.8x10.2mm  
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(2.40”×1.25”×0.40”)  
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Voltage and resistor-based trim  
No minimum load required  
Output voltage programmable from  
0.9Vdc to 3.63Vdc via external resistors  
Fixed frequency operation  
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Single-in line package (SIP)  
Input UVLO, output OCP, OTP, SCP  
Remote ON/OFF (Positive)  
Power good output signal (open collector)  
Output voltage sense  
ISO 9001, TL 9000, ISO 14001, QS9000,  
OHSAS18001 certified manufacturing facility  
UL/cUL 60950-1 (US & Canada), TUV  
(EN60950-1) - pending  
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Delphi ND Series Non-Isolated Point of Load  
DC/DC Power Modules: 12Vin, 0.9V~3.63Vout,  
50Aout  
OPTION  
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Negative on/off logic  
Current sharing  
The Delphi ND Series, 12V input, single output, non-isolated point of  
load (POL) DC/DC converters are the latest offering from a world leader  
in power systems technology and manufacturing — Delta Electronics,  
Inc. The ND/NE product family is the second generation, non-isolated  
point-of-load DC/DC power modules for the DataCom / Networking / IT  
Applications and it will help to cut the module size by 35% to 50%  
compared to the first generation NC series POL modules. The ND/NE  
product family provides 6A to 60A of output current in a vertically or  
horizontally mounted through-hole package and the output can be  
resistor trimmed from 0.9Vdc to 3.63Vdc. It provides a very cost  
effective, high efficiency, and high density 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.  
APPLICATIONS  
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DataCom  
Distributed power architectures  
Servers and workstations  
LAN / WAN applications  
Data processing applications  
PRELIMINARY DATASHEET  
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ELECTRICAL CHARACTERISTICS CURVES  
95  
90  
85  
80  
75  
95  
90  
85  
80  
75  
70  
10.2  
12.0  
13.8  
10.2  
12.0  
13.8  
70  
5.01 10 15 20 25 30 35 40 45 50  
5.01 10 15 20 25 30 35 40 45 50  
OUTPUT CURRENT (A)  
OUTPUT CURRENT (A)  
Figure 1: Converter efficiency vs. output current  
Figure 2: Converter efficiency vs. output current  
(0.9V output voltage)  
(1.2V output voltage)  
95  
90  
85  
80  
75  
100  
95  
90  
85  
80  
75  
10.2  
12.0  
13.8  
10.2  
12.0  
13.8  
70  
70  
5.01 10 15 20 25 30 35 40 45 50  
5.01 10 15 20 25 30 35 40 45 50  
OUTPUT CURRENT (A)  
OUTPUT CURRENT (A)  
Figure 3: Converter efficiency vs. output current  
Figure 4: Converter efficiency vs. output current  
(1.5V output voltage)  
(1.8V output voltage)  
100  
95  
90  
85  
80  
75  
100  
95  
90  
85  
80  
10.2  
12.0  
13.8  
75  
70  
10.2  
12.0  
13.8  
70  
5.01 10 15 20 25 30 35 40 45 50  
5.01 10 15 20 25 30 35 40 45 50  
OUTPUT CURRENT (A)  
OUTPUT CURRENT (A)  
Figure 5: Converter efficiency vs. output current  
Figure 6: Converter efficiency vs. output current  
(2.5V output voltage)  
(3.3V output voltage)  
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ELECTRICAL CHARACTERISTICS CURVES (CON.)  
Figure 7: Output ripple & noise at 12Vin, 0.9V/50A out  
Figure 8: Output ripple & noise at 12Vin, 1.2V/50A out  
Figure 9: Output ripple & noise at 12Vin, 1.5V/50A out  
Figure 10: Output ripple & noise at 12Vin, 1.8V/50A out  
Figure 11: Output ripple & noise at 12Vin, 2.5V/50A out  
Figure 12: Output ripple & noise at 12Vin, 3.3V/50A out  
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ELECTRICAL CHARACTERISTICS CURVES (CON.)  
Figure 13: Turn on delay time at 12Vin, 0.9V/50A out  
Figure 14: Turn on delay time Remote On/Off, 0.9V/50A out  
Ch1: Vout Ch4: Vin  
Ch1: Vout Ch4: Enable  
Figure 15: Turn on delay time at 12Vin, 3.3V/50A out  
Figure 16: Turn on delay time at Remote On/Off, 3.3V/50A out  
Ch1: Vout Ch4: Vin  
Ch1: Vout Ch4: Enable  
Figure 17: Typical transient response to step load change at  
Figure 18: 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  
10A/μS from 50%to 75% and 75% to 50 of Io, max at 12Vin, 1.2V  
out  
out  
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Figure 19: Typical transient response to step load change at  
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, 1.5V  
10A/μS from 50%to 75% and 75% to 50 of Io, max at 12Vin, 1.8V  
out  
out  
Figure 21: Typical transient response to step load change at  
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, 2.5V  
10A/μS from 50%to 75% and 75% to 50 of Io, max at 12Vin, 3.3V  
out  
out  
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DESIGN CONSIDERATIONS  
FEATURES DESCRIPTIONS  
The ND 50A uses two phase and voltage mode controlled  
buck topology. The output can be trimmed in the range of  
0.9Vdc to 3.63Vdc with a resistor from Trim pin to Ground.  
A remote sense function is provided and it is able to  
compensate for a drop from the output of converter to  
point of load.  
ENABLE (On/Off)  
The ENABLE (on/off) input allows external circuitry to put  
the ND converter into a low power dissipation (sleep)  
mode. Positive ENABLE is available as standard.  
Positive ENABLE units of the ND 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 0.8V.  
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 the 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.  
The ENABLE input can be driven in a variety of ways as  
shown in Figures 23 and 24. If the ENABLE signal comes  
from the primary side of the circuit, the ENABLE can be  
driven through either a bipolar signal transistor (Figure  
23). 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 24).  
The converter provides an open collector Power Good  
signal. 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.  
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 20°C  
Safety Considerations  
It is recommended that the user to provide a fuse with  
TBD in the input line for safety. The output voltage  
set-point and the output current in the application could  
define the amperage rating of the fuse.  
Figure 23: Enable Input drive circuit for ND series  
Figure 24: Enable input drive circuit example with isolation.  
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Over Temperature Protection (OTP)  
FEATURES DESCRIPTIONS (CON.)  
To provide additional over-temperature protection in a  
fault condition, the unit is equipped with a non-latching  
thermal shutdown circuit. The shutdown circuit engages  
when the temperature of monitored component exceeds  
approximately 125°C. The unit will cycle on and off while  
the fault condition exists. The unit will recover from  
shutdown when the cause of the over temperature  
condition is removed  
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 7.6V to  
9.0V.  
Over-Current and Short-Circuit Protection  
Output Voltage Programming  
The ND 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.  
The output voltage of the ND series is trimmable by  
connecting an external resistor between the trim pin and  
output ground as shown Figure 26 and the typical trim  
resistor values are shown in Figure 27.  
An over current condition is detected by measuring the  
voltage drop across the MOSFETs. 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.  
The detection of the Rds(on) of MOSFETs also acts as  
an over temperature protection since high temperature  
will cause the Rds(on) of the MOSFETs to increase,  
eventually triggering over-current protection.  
Figure 26: Trimming Output Voltage  
The ND50 module has a trim range of 0.9V to 3.63V.  
The trim resistor equation for the ND50A is:  
Remote sense  
The ND50 provide Vo remote sensing to achieve proper  
regulation at the load points and reduce effects of  
distribution losses on output line. In the event of an open  
remote sense line, the module shall maintain local sense  
regulation through an internal resistor. The module shall  
correct for a total of 0.5V of loss. The remote sense  
connects as shown in Figures 25.  
Vout is the output voltage setpoint  
Rs is the resistance between Trim and Ground  
Rs values should not be less than 3.32k  
Output Voltage  
Rs ()  
0.9V  
open  
38.3k  
18.7k  
12.1k  
6.34k  
+1.2 V  
+1.5 V  
+1.8V  
+2.5 V  
+3.3V  
3.92k  
3.32k  
+3.63V  
Figure 27: Typical trim resistor values  
Figure 25: circuit configuration for remote sense  
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FEATURES DESCRIPTIONS (CON.)  
The output can also be set by an external voltage  
connected to trim pin as shown in Figure 28  
Output Capacitance  
an external output capacitor(min 680uF) is required for  
stable operation.  
Voltage Margining Adjustment  
Output voltage margin adjusting can be implemented in  
the ND 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 29 shows the circuit  
configuration for output voltage margining adjustment.  
Figure 28: output voltage trim with voltage source  
To use voltage trim, the trim equation for the ND50 is  
(please refer to Fig.28):  
Vout is the desired output voltage  
Vt is the external trim voltage  
Rs is the resistance between Trim and Ground (in K)  
Rt is the resistor to be defined with the trim voltage (in K)  
Figure 29: Circuit configuration for output voltage margining  
Reflected Ripple Current and Output Ripple and  
Noise Measurement  
Below is an example about using this voltage trim equation:  
Example:  
The measurement set-up outlined in Figure 30 has been  
used for both input reflected/ terminal ripple current and  
output voltage ripple and noise measurements on ND  
series converters.  
If Vt=1.25V, desired Vout=2.5V and Rs=1kΩ  
Power Good  
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 ale 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.  
Cs=270μF*1, Ltest=1.4uH, Cin=270μF*2. Cout=680uF*4  
Figure 30: Input reflected ripple/ capacitor ripple current and  
output voltage ripple and noise measurement setup for ND50  
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THERMAL CUREVES `  
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.  
Figure 32: Temperature measurement location* The allowed  
maximum hot spot temperature is defined at 124  
ND12S0A0V50(standard) Output Current vs. Ambient Temperature and Air Velocity  
Output Current (A)  
@Vin=12V Vout=0.9V (Through PCB Orientation)  
55  
50  
45  
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’’).  
Natural  
Convection  
40  
35  
30  
25  
20  
15  
10  
5
100LFM  
200LFM  
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.  
0
25  
30  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
Ambient Temperature ()  
Figure 33: Output current vs. ambient temperature and air  
velocity @Vin=12V, Vout=0.9V(Through PCB Orientation)  
ND12S0A0V50(standard) Output Current vs. Ambient Temperature and Air Velocity  
Output Current (A)  
@Vin=12V Vout=2.5V (Through PCB Orientation)  
55  
50  
45  
PWB  
FACING PWB  
MODULE  
Natural  
Convection  
40  
35  
100LFM  
30  
200LFM  
25  
AIR VELOCITY  
300LFM  
AND AMBIENT  
TEMPERATURE  
MEASURED BELOW  
THE MODULE  
20  
15  
10  
5
50.8 (2.0”)  
AIR FLOW  
0
25  
30  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
Ambient Temperature ()  
11 (0.43”)  
22 (0.87”)  
Figure 34: Output current vs. ambient temperature and air  
Note: Wind tunnel test setup figure dimensions are in  
millimeters and (Inches)  
velocity@ Vin=12V, Vout=2.5V(Through PCB Orientation)  
Figure 31: Wind tunnel test setup  
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THERMAL CUREVES  
ND12S0A0V50(standard) Output Current vs. Ambient Temperature and Air Velocity  
Output Current (A)  
55  
@Vin=12V Vout=3.3V (Through PCB Orientation)  
50  
45  
40  
35  
30  
25  
20  
15  
10  
5
Natural  
Convection  
100LFM  
200LFM  
300LFM  
400LFM  
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@ Vin=12V, Vout=3.3V(Through PCB Orientation)  
MECHANICAL DRAWING  
VERTICAL  
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PART NUMBERING SYSTEM  
ND  
12  
S
0A0  
V
50  
P
N
F
A
Product  
Series  
Number of  
outputs  
Output  
Voltage  
Output  
Current  
ON/OFF  
Logic  
Pin  
Length  
Option  
Code  
Input Voltage  
Mounting  
ND-  
12- 10.2~13.8V S- Single  
Output  
0A0 -  
V- Vertical  
50-50A P- Positive  
N- Negative  
N- 0.150” F- RoHS 6/6 A- Standard  
Non-isolated  
Series  
Programmable  
Functions  
(Lead Free)  
MODEL LIST  
Efficiency  
12Vin @ 100% load  
Model Name  
Packaging  
Input Voltage  
Output Voltage Output Current  
ND12S0A0V50PNFA  
Vertical  
10.2 ~ 13.8Vdc  
0.9 V ~ 3.63Vdc  
50A  
92.5%  
USA:  
Telephone:  
East Coast: (888) 335 8201  
West Coast: (888) 335 8208  
Fax: (978) 656 3964  
Europe:  
Telephone: +41 31 998 53 11  
Fax: +41 31 998 53 53  
Asia & the rest of world:  
Telephone: +886 3 4526107 ext. 6220  
Fax: +886 3 4513485  
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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