Delta Electronics 0.59V~5.1Vout User manual

Delphi NE Series Non-Isolated Point of Load
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
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
PRELIMINARY DATASHEET
DS_NE12S20A_072722007

Preliminary DS_NE12S20A_07272007
2
TECHNICAL SPECIFICATIONS
(Ambient Temperature=25°C, minimum airflow=200LFM, nominal Vin=12Vdc unless otherwise specified.)
PARAMETER 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 Turn on overshoot <1% vo ,ESR≥1m2000 µF
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 %
SINKEFFICIENCY
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 25℃, 300LFM, 80% load TBD Mhours
Weight 8.8 grams

Preliminary DS_NE12S20A_07272007
3
ELECTRICAL CHARACTERISTICS CURVES
55
60
65
70
75
80
85
90
95
1 2 4 6 8 101214161820
Output current (A)
Efficiency (%)
55
60
65
70
75
80
85
90
95
1 2 4 6 8 10 12 14 16 18 20
Output current (A)
Efficiency (%)
Figure 1: Converter efficiency vs. output current
(0.59V output voltage, 12V input)
Figure 2: Converter efficiency vs. output current
(0.9V output voltage, 12V input)
55
60
65
70
75
80
85
90
95
12468101214161820
Output current (A)
Efficiency (%)
55
60
65
70
75
80
85
90
95
1 2 4 6 8 101214161820
Output current (A)
Efficiency (%)
Figure 3: Converter efficiency vs. output current
(1.5V output voltage, 12V input)
Figure 4: Converter efficiency vs. output current
(2.5V output voltage, 12V input)
55
60
65
70
75
80
85
90
95
1 2 4 6 8 101214161820
Output current (A)
Efficiency (%)
55
60
65
70
75
80
85
90
95
1 2 4 6 8 101214161820
Output current (A)
Efficiency (%)
Figure 5: Converter efficiency vs. output current
(3.3V output voltage, 12V input)
Figure 6: Converter efficiency vs. output current
(5.0V output voltage, 12V input)

Preliminary DS_NE12S20A_07272007
4
ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 7: Output ripple & noise at 12Vin, 0.59V/20A out
Figure 8: Output ripple & noise at 12Vin, 0.9V/20A out
Figure 9: Output ripple & noise at 12Vin, 1.5V/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

Preliminary DS_NE12S20A_07272007
5
ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 13: Turn on delay time at 12Vin, 0.59V/20A out
Ch1: Vin, Ch4: Vout Figure 14: Turn on delay time Remote On/Off, 2.5V/20A out Ch1: Enable, Ch4: Vout
Figure 15: Turn on delay time at 12Vin, 3.3V/20A out
Ch1: Vin, Ch4: Vout 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
0
0
0
0
0
0
0
0

Preliminary DS_NE12S20A_07272007
6
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
r
from Trim pin to Ground.
The converter can be turned ON/OFF by remote control
with positive on/off (ENABLE pin) logic. The converte
r
DC output is disabled when the signal is driven lo
w
(below 0.3V). This pin is also used as the input turn on
threshold judgment. Its voltage is percent of Inpu
t
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
t
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
f
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
r
placed between the “Enable” pin and “Ground” pin.
The formula for calculating the value of this resistor is:
5.1
2.18 )2.18(50
_+
×
+
×
=R
R
VRTHEN
1
__
−
=
RTHENFTHEN VV
NE20A
R
Enable
Fig. 18. Enable POR circuit.
FTHEN
V_is the falling threshold
RTHEN
V_is the rising threshold that you want.
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
7
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.
FEATURES DESCRIPTIONS (CON.)
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).
ND6A/10A
Vout
Ground
Trim Enable
Ground
Vin
Figure 19: Enable Input drive circuit for NE series
Ground Ground
ND 6A/10A
Vin
Vout
Trim
Enable
Figure 20: Enable input drive circuit example with isolation.
Input Under-Voltage Lockout
The input under-voltage lockout prevents the converte
r
from being damaged while operating when the inpu
t
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
t
and short-circuit protection circuitry. When over curren
t
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.
Vin Vout
Enable
Ground Ground
Trim
ND 6A/10A
Rs
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:
591.0
1182
)( − =Ω Vout Rs
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)
0.59V open
+1 V 2.4k
+1.5 V 1.3K
+2.5 V 619
+3.3 V 436
+5.0V 268
Table 1: Typical trim resistor values
NE2
0A
NE
2
0A
NE
2
0A

Preliminary DS_NE12S20A_07272007
8
Vin Vout
Enable
Ground Ground
Trim
N
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.
D 6A/10A
Rmargin-down
Rs
Rmargin-up
NE20
A
Output voltage margin adjusting can be implemented in
the NE 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 lowe
r
by connecting a resistor, Rmargin-down, from the Trim pin to
the voltage source Vt. Figure 22 shows the circuit
configuration for output voltage margining adjustment.
Vt
Voltage Margining Adjustment
FEATURES DESCRIPTIONS (CON.)
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.
DC-DC Converter
1uF
Ceramic Ta n
10uF
Vin+ Load
Ltest
Cs Cin
Output voltage ripple noise measurement point
Input reflected current measurement point
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

Preliminary DS_NE12S20A_07272007
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.
THERMAL CURVES (NE12S0A0V20)
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Figure 25: Temperature measurement location* The allowed
maximum hot spot temperature is defined at 130
℃
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=12V Vout=5.0V (Through PWB Orientation)
0
2
4
6
8
10
12
14
16
18
20
25 30 35 40 45 50 55 60 65 70 75 80 85
Natural
Convection
100LFM 200LFM
Ambient Tem
p
erature
(
℃
)
Output Current (A)
500LFM
400LFM
600LFM
300LFM
Figure 26: Output current vs. ambient temperature and air
velocity @Vin=12V, Vout=5.0V (Through PWB Orientation)
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=12V Vout=2.5V (Through PWB Orientation)
0
2
4
6
8
10
12
14
16
18
20
25 30 35 40 45 50 55 60 65 70 75 80 85
Natural
Convection 100LFM 200LFM
Ambient Temperature (
℃
)
Output Current (A)
500LFM
400LFM
600LFM
300LFM
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.
MODULE
A
IR FLOW
11 (0.43”)
50.8 (2.0”)
FACING PWB PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
22 (0.87”)
Note: Wind tunnel test setup figure dimensions are in
millimeters and (Inches)
Figure 24: Wind tunnel test setup
Figure 27: Output current vs. ambient temperature and air
velocity@ Vin=12V, Vout=2.5V (Through PWB Orientation)

Preliminary DS_NE12S20A_07272007
10
THERMAL CURVES (NE12S0A0V20)
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=5.0V Vout=2.5V (Through PWB Orientation)
0
2
4
6
8
10
12
14
16
18
20
25 30 35 40 45 50 55 60 65 70 75 80 85
Natural
Convection 100LFM 200LFM
Ambient Temperature (
℃
)
Output Current (A)
500LFM
400LFM
600LFM
300LFM
Figure 28: Output current vs. ambient temperature and air
velocity@ Vin=5.0V, Vout=2.5V (Through PWB Orientation)
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=12V Vout=0.9V (Through PWB Orientation)
0
2
4
6
8
10
12
14
16
18
20
25 30 35 40 45 50 55 60 65 70 75 80 85
Natural
Convection 100LFM 200LFM
Ambient Temperature
(
)
Output Current (A)
500LFM
400LFM
300LFM
Figure 29: Output current vs. ambient temperature and air
velocity @Vin=12V, Vout=0.9V (Through PWB Orientation)
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=5.0V Vout=0.9V (Through PWB Orientation)
0
2
4
6
8
10
12
14
16
18
20
25 30 35 40 45 50 55 60 65 70 75 80 85
Natural
Convection 100LFM
200LFM
Ambient Temperature (
℃
)
Output Current (A)
400LFM
300LFM
Figure 30: Output current vs. ambient temperature and air
velocity@ Vin=5.0V, Vout=0.9V (Through PWB Orientation)

Preliminary DS_NE12S20A_07272007
11
VERTICAL HORIZONTAL
MECHANICAL DRAWING

Preliminary DS_NE12S20A_07272007
12
PART NUMBERING SYSTEM
MODEL LIST
NE 12 S 0A0 V 20 P N F A
Product
Series
Input
Voltage
Number of
outputs Output Voltage Mounting Output
Current
ON/OFF
Logic
Pin
Length
Option
Code
NE-
Non-isolated
Series
12- 4.5~13.8V S- Single
output
0A0 - programmable V- Vertical
H- Horizontal
20-20A P- Positive
N- Negative
N- 0.150” F- RoHS 6/6
(Lead Free)
A-standard
function
Model Name Packaging Input Voltage Output Voltage Output Current Efficiency
12Vin @ 100% load
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
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: [phone]
West Coast: [phone]
Fax: [phone]
Email: [email protected]
Europe:
Telephone: [phone]
Fax: [phone]
Email: [e-mail]
Asia & the rest of world:
Telephone: [phone] ext. 6220
Fax: [phone]
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.