Delta Electronics 20A, 4.5V-13.8Vin, 0.59V-5.1Vout User Manual

Delphi NE Series Non-Isolated Point of Load

FEATURES

 High Efficiency:

94.0% @ 12Vin, 5V/20A out

 Size:

Vertical: 30.5x15.5x12.0mm

(1.20”x0.61”x0.47”)

Horizontal: 30.5x15.5x12.9mm

(1.20”x0.61”x0.51”)

 Wide input range: 4.5V~13.8V

 Output voltage programmable from

0.59Vdc to 5.1Vdc via external resistors

 Voltage and resistor-based trim

 No minimum load required

 Fixed frequency operation

 Input UVLO, output OCP

 Remote ON/OFF (Positive)

 ISO 9001, TL 9000, ISO 14001, QS9000,

OHSAS18001 certified manufacturing facility

 UL/cUL 60950 (US & Canada), TUV

(EN60950) --pending

DC/DC Modules: 4.5V~13.8Vin, 0.59V~5.1Vout, 20A

The Delphi NE 20A Series, 4.5 to 13.8V wide input, wide trim 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 ND/NE product family is

the second generation, non-isolated point-of-load DC/DC power

modules for the datacom applications which cut the module size by

almost 50% in most of the cases compared to the first generation NC

series POL modules. The product family here provides 20A of output

current in a vertically or horizontally mounted through-hole package

and the output can be resistor trimmed from 0.59Vdc to 5.1Vdc. 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.

OPTIONS

 Vertical or horizontal versions

APPLICATIONS

 DataCom

 Distributed power architectures

 Servers and workstations

 LAN/WAN applications

 Data processing applications

PRELIMINARY DATASHEET
DS_NE12S20A_072722007

TECHNICAL SPECIFICATIONS

(Ambient Temperature=25°C, minimum airflow=200LFM, nominal Vin=12Vdc unless otherwise specified.)

PARAMETE R NOTES and CONDITIONS NE12S0A0V/H20

Min. Typ. Max. Units

ABSOLUTE MAXIMUM RATINGS

Input Voltage operation 4.5 13.8 Vdc
Operating Temperature (Vertical) Refer to Fig.25 for the measuring point 0 130 °C
Operating Temperature (Horizontal) Refer to Fig.25 for the measuring point 0 TBD °C
Storage Temperature -55 125 °C

INPUT CHARACTERISTICS

Operating Input Voltage 4.5 13.8 V
Input Under-Voltage Lockout

Turn-On Voltage Threshold 4.3 V
Turn-Off Voltage Threshold 3.3 V

Lockout Hysteresis Voltage 1.0 V
Maximum Input Current 12Vin, 5Vo, operating, full load 8.9 A
No-Load Input Current Vin=12V, Vout=5V 150 mA

Off Converter Input Current Remote OFF 10 mA
Input Reflected-Ripple Current P-P thru 2uH inductor 5Hz to 20MHz 30 mA
Input Ripple Rejection 120Hz 60 dB

OUTPUT CHARACTERISTICS

Output Voltage Adjustment Range 0.59 5.1 V
Output Voltage Set Point With a 0.1% trim resistor -1 +1 %Vo
Output Voltage Regulation

Over Load Io=Io_min to Io_max -0.5 +0.5 %Vo

Over Line Vin=Vin_min to Vin_max -0.2 +0.2 %Vo
Total output range Over load, line, temperature regulation and set point -2.0 +2.0 %Vo
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 10uF Tan cap, 12Vin, 5Vo 20 mV

RMS Full Load, 10uF Tan cap, 12Vin, 5Vo 5 mV
Output Current Range 0 20 A
Output Voltage Under-shoot at Power-Off Vin=12V, Turn OFF 100 mV
Output short-circuit current, RMS value Continuous 3.6 A
Output DC Current-Limit Inception Hiccup mode 110 200 %Iomax

DYNAMIC CHARACTERISTICS

Output Dynamic Load Response 12Vin, 2.5Vout, 10µF ceramic cap

Positive Step Change in Output Current 75~100% load , 5A/uS 200 mV

Negative Step Change in Output Current 100~75% load , 5A/uS 200 mV

Settling Time Settling to be within regulation band (to 10% Vo deviation) 100 µs
Turn-On Transient

Start-Up Time, from On/Off Control From Enable high to 90% of Vo 2 3 ms

Start-Up Time, from input power From Vin=12V to 90% of Vo 2 3 ms
Minimum Output Capacitance 0 µF

5.0Vo,Maximum Output Capacitance

EFFICIENCY

Vo=0.59V Vin=12V, Io=20A 75 %
Vo=0.9V Vin=12V, Io=20A 80.5 %
Vo=2.5V Vin=12V, Io=20A 91 %
Vo=5.0V Vin=12V, Io=20A 94 %

SINK EFFICIENCY

Vo=5.0V Vin=12V, Io=20A 92 %

FEATURE CHARACTERISTICS

Switching Frequency Fixed 500 KHz
ON/OFF Control Positive logic (internally pulled high)
Logic High Module On (or leave the pin open) 0.8 5.0 V
Logic Low Module Off 0 0.3 V

GENERAL SPECIFICATIONS

Calculated MTBF
Weight 8.8 grams

Turn on overshoot <1% vo ,ESR≥1m

25℃, 300LFM, 80% load

2000 µF

TBD Mhours

Preliminary DS_NE12S20A_07272007

2

ELECTRICAL CHARACTERISTICS CURVES

95

90

85

80

75

70

Efficiency (%)

65

60

55

1 2 4 6 8 101214161820

Output current (A)

95

90

85

80

75

70

Efficiency (%)

65

60

55

1 2 4 6 8 10 12 14 16 18 20

Output current (A)

Figure 1: Converter efficiency vs. output current

(0.59V output voltage, 12V input)

95

90

85

80

75

70

Efficiency (%)

65

60

55

12468101214161820

Output current (A)

Figure 3: Converter efficiency vs. output current

(1.5V output voltage, 12V input)

95

90

85

80

75

70

Efficiency (%)

65

60

55

1 2 4 6 8 101214161820

Output current (A)

Figure 5: Converter efficiency vs. output current

(3.3V output voltage, 12V input)

Figure 2: Converter efficiency vs. output current

(0.9V output voltage, 12V input)

95

90

85

80

75

70

Efficiency (%)

65

60

55

1 2 4 6 8 101214161820

Output current (A)

Figure 4: Converter efficiency vs. output current

(2.5V output voltage, 12V input)

95

90

85

80

75

70

Efficiency (%)

65

60

55

1 2 4 6 8 101214161820

Output current (A)

Figure 6: Converter efficiency vs. output current

(5.0V output voltage, 12V input)

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3

ELECTRICAL CHARACTERISTICS CURVES (CON.)

Figure 7: Output ripple & noise at 12Vin, 0.59V/20A out

Figure 9: Output ripple & noise at 12Vin, 1.5V/20A out

Figure 8: Output ripple & noise at 12Vin, 0.9V/20A out

Figure 10: Output ripple & noise at 12Vin, 2.5V/20A out

Figure 11: Output ripple & noise at 12Vin, 3.3V/20A out

Preliminary DS_NE12S20A_07272007

Figure 12: Output ripple & noise at 12Vin, 5.0V/20A out

4

ELECTRICAL CHARACTERISTICS CURVES (CON.)

0

0

Figure 13: Turn on delay time at 12Vin, 0.59V/20A out

Ch1: Vin, Ch4: Vout

0

0

Figure 15: Turn on delay time at 12Vin, 3.3V/20A out

Ch1: Vin, Ch4: Vout

0

0

Figure 14: Turn on delay time Remote On/Off, 2.5V/20A out

Ch1: Enable, Ch4: Vout

0

0

Figure 16: Turn on delay time at Remote On/Off, 5.0V/20A out

Ch1: Enable, Ch4: Vout

Figure 17: Typical transient response to step load change at 5A/µS
from 75%~100% load, at 12Vin, 2.5V out

Preliminary DS_NE12S20A_07272007

5

r

r

w

t

t

f

r

+

×

−

=

DESIGN CONSIDERATIONS

The NE12S0A0V(H)20 uses a single phase and voltage
mode controlled buck topology. The output can be
trimmed in the range of 0.59Vdc to 5.1Vdc by a resisto
from Trim pin to Ground.

The converter can be turned ON/OFF by remote control
with positive on/off (ENABLE pin) logic. The converte
DC output is disabled when the signal is driven lo
(below 0.3V). This pin is also used as the input turn on
threshold judgment. Its voltage is percent of Inpu
voltage during floating due to internal connection. So we
do not suggest using an active high signal (higher than

0.8V) to turn on the module because this high level
voltage will disable UVLO function. The module will turn
on when this pin is floating and the input voltage is
higher than the threshold.

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.

Safety Considerations

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 amperage rating of the fuse.

FEATURES DESCRIPTIONS

Enable (On/Off)

The ENABLE (on/off) input allows external circuitry to
put the NE converter into a low power dissipation (sleep)
mode. Positive ENABLE is available as standard. With
the active high function, the output is guaranteed to turn
on if the ENABLE pin is driven above 0.8V. The outpu
will turn off if the ENABLE pin voltage is pulled below

0.3V

The ENABLE pin is also used as input UVLO function.
Leaving the Enable floating, the module will turn on if the
input voltage is higher than turn on threshold and turn of
if the input voltage is lower than turn off threshold. The
default Turn-on voltage is 4.3V with 1V Hysteresis.

The Turn-on voltage may be adjusted with a resisto
placed between the “Enable” pin and “Ground” pin.
The formula for calculating the value of this resistor is:

V

=

_

RTHEN

R

2.18

VV

__

RTHENFTHEN

)2.18(50

5.1

+

×

R

1

Enable

NE20A

R

Fig. 18. Enable POR circuit.

is the falling threshold

FTHENV_

is the rising threshold that you want.

RTHENV_

R (Kohm) is the outen resistor that you connect from
Enable pin to the GND

Also, you will see an active high voltage will disable the
input UVLO function

Preliminary DS_NE12S20A_07272007

6

FEATURES DESCRIPTIONS (CON.)

r

t

t

t

The ENABLE input can be driven in a variety of ways as
shown in Figures 19 and 20. If the ENABLE signal comes
from the primary side of the circuit, the ENABLE can be
driven through either a bipolar signal transistor (Figure

18).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 19).

Figure 19: Enable Input drive circuit for NE series

Figure 20: Enable input drive circuit example with isolation.

Input Under-Voltage Lockout

The input under-voltage lockout prevents the converte
from being damaged while operating when the inpu
voltage is too low. The lockout occurs between 3.3V to

4.3V.

Over-Current and Short-Circuit Protection

The NE series modules have non-latching over-curren
and short-circuit protection circuitry. When over curren
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 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.

Preliminary DS_NE12S20A_07272007

ND6A/10A

Vin

Enable

Ground

ND 6A/10A

Vin

Enable

Ground

Vout

Trim

Ground

Ground

Vout

Trim

Output Voltage Programming

The output voltage of the NE series is trimmable by
connecting an external resistor between the trim pin and
output ground as shown Figure 21 and the typical trim
resistor values are shown in Table 1.

Figure 21: Trimming Output Voltage

The NE20 module has a trim range of 0.59V to 5.0V.
The trim resistor equation for the NE20A is:

)(

Rs

=Ω

Vout

Vout is the output voltage setpoint
Rs is the resistance between Trim and Ground
Rs values should not be less than 240

Output Voltage Rs (Ω)

Table 1: Typical trim resistor values

ND 6A/10A

NE20A

Vin Vout

Enable

Ground

1182

591.0

−

0.59V
+1 V

+1.5 V
+2.5 V
+3.3 V

+5.0V

Trim

Rs

Ground

open

2.4k

1.3K
619
436
268

7

r

FEATURES DESCRIPTIONS (CON.)

Voltage Margining Adjustment

Output voltage margin adjusting can be implemented in
the NE modules by connecting a resistor, R
the Trim pin to the Ground for margining
voltage. Also, the output voltage can be adjusted lowe
by connecting a resistor, Rmargin-do wn, from the Trim pin to
the voltage source Vt. Figure 22 shows the circuit
configuration for output voltage margining adjustment.

Vt

N

D 6A/10A

NE20A

Vin Vout

Enable

Ground

Trim

Ground

Rs

Rmargin-down

Rmargin-up

Figure 22: Circuit configuration for output voltage margining

Paralleling

NE20 converters do not have built-in current sharing
(paralleling) ability. Hence, paralleling of multiple NE20
converter is not recommended.

margin-up, from

up the output

Output Capacitance

There is internal output capacitor on the NE series
modules. Hence, no external output capacitor is required
for stable operation.

Reflected Ripple Current and Output Ripple and
Noise Measurement

The measurement set-up outlined in Figure 23 has been
used for both input reflected/ terminal ripple current and
output voltage ripple and noise measurements on NE
series converters.

Input reflected current measurement point

Vin+ Load

Cs=270µF*1, Ltest=2uH, Cin=270µF*1

Figure 23: Input reflected ripple/ capacitor ripple current and
output voltage ripple and noise measurement setup for NE20

Ltest

Cs

Cin

DC-DC Converter

1uF

Ceramic

Output voltage ripple noise measurement point

10uF

Tan

Preliminary DS_NE12S20A_07272007

8

)

A

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.

IR FLOW

PWB

MODULE

50.8 (2.0”)

11 (0.43”)
22 (0.87”)

FACING PWB

AIR VELOCITY
AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

Note: Wind tunnel test setup figure dimensions are in

millimeters and (Inches)

Figure 24: Wind tunnel test setup

THERMAL CURVES (NE12S0A0V20)

Figure 25: Temperature measurement location* The allowed
maximum hot spot temperature is defined at 130

Output Current (A)

20

18

16

14

12

10

8

6

4

2

0

25 30 35 40 45 50 55 60 65 70 75 80 85

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=12V Vout=5.0V (Through PWB Orientation)

Natural

Convection

100LFM

200LFM

300LFM

400LFM

500LFM

600LFM

Figure 26: Output current vs. ambient temperature and air
velocity @Vin=12V, Vout=5.0V (Through PWB Orientation)

Output Current (A)

20

18

16

14

12

10

8

6

4

2

0

25 30 35 40 45 50 55 60 65 70 75 80 85

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=12V Vout=2.5V (Through PWB Orientation)

Natural

Convection

100LFM

200LFM

300LFM

400LFM

500LFM

600LFM

Figure 27: Output current vs. ambient temperature and air
velocity@ Vin=12V, Vout=2.5V (Through PWB Orientation)

℃

Ambient Temperature (℃

Ambient Temperature (℃)

Preliminary DS_NE12S20A_07272007

9

THERMAL CURVES (NE12S0A0V20)

Output Current (A)

20

18

16

14

12

10

8

6

4

2

0

25 30 35 40 45 50 55 60 65 70 75 80 85

Figure 28: Output current vs. ambient temperature and air
velocity@ Vin=5.0V, Vout=2.5V (Through PWB Orientation)

Output Current (A)

20

18

16

14

12

10

8

6

4

2

0

25 30 35 40 45 50 55 60 65 70 75 80 85

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=5.0V Vout=2.5V (Through PWB Orientation)

Natural

100LFM

Convection

Natural

Convection

200LFM

300LFM

@Vin=12V Vout=0.9V (Through PWB Orientation)

100LFM

200LFM

400LFM

300LFM

500LFM

600LFM

Ambient Temperature (℃)

400LFM

500LFM

Ambient Temperature

Figure 29: Output current vs. ambient temperature and air
velocity @Vin=12V, Vout=0.9V (Through PWB Orientation)

Output Current (A)

20

18

16

14

12

10

8

6

4

2

0

25 30 35 40 45 50 55 60 65 70 75 80 85

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=5.0V Vout=0.9V (Through PWB Orientation)

Natural

Convection

100LFM

200LFM

300LFM

400LFM

Ambient Temperature (℃)

Figure 30: Output current vs. ambient temperature and air
velocity@ Vin=5.0V, Vout=0.9V (Through PWB Orientation)

Preliminary DS_NE12S20A_07272007

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MECHANICAL DRAWING

VERTICAL HORIZONTAL

Preliminary DS_NE12S20A_07272007

11

PART NUMBERING SYSTEM

NE 12 S 0A0 V 20 P N F A

Product

Series

NE-

Non-isolated

Series

Input

Voltage

12- 4.5~13.8V S- Single

Number of

outputs

output

Output Voltage Mounting

0A0 - programmable V- Vertical

H- Horizontal

Output

Current

20-20A P- Positive

ON/OFF

Logic

N- Negative

Pin

Option

Length

N- 0.150” F- RoHS 6/6

(Lead Free)

Code

A-standard
function

MODEL LIST

Model Name Packaging Input Voltage Output Voltage Output Current

NE12S0A0V20PNFA Vertical 4.5V~ 13.8Vdc 0.59V~ 5.1Vdc 20A 94.0%@5Vout

NE12S0A0H20PNFA Horizontal 4.5V~ 13.8Vdc 0.59V~ 5.1Vdc 20A 94.0%@5Vout

Efficiency

12Vin @ 100% load

CONTACT:

USA:

Telephone:
East Coast: [phone]
West Coast: [phone]
Fax: [phone]

[e-mail]

Email:

www.delta.com.tw/dcdc

Europe:

Telephone: [phone]
Fax: [phone]

[e-mail]

Email:

Asia & the rest of world:

Telephone: [phone] ext. 6220
Fax: [phone]

[e-mail]

Email:

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

.

Preliminary DS_NE12S20A_07272007

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