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
ꢀ
Delphi NE Series Non-Isolated Point of Load
DC/DC Modules: 4.5V~13.8Vin, 0.59V~5.1Vout, 20A
OPTIONS
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.
ꢀ
Vertical or horizontal versions
APPLICATIONS
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
DataCom
Distributed power architectures
Servers and workstations
LAN/WAN applications
Data processing applications
PRELIMINARY DATASHEET
DS_NE12S20A_072722007
Download from Www.Somanuals.com. All Manuals Search And Download.
ELECTRICAL CHARACTERISTICS CURVES
95
90
85
80
75
70
65
60
55
95
90
85
80
75
70
65
60
55
1
2
4
6
8
10 12 14 16 18 20
1
2
4
6
8
10 12 14 16 18 20
Output current (A)
Output current (A)
Figure 1: Converter efficiency vs. output current
Figure 2: Converter efficiency vs. output current
(0.59V output voltage, 12V input)
(0.9V output voltage, 12V input)
95
90
85
80
75
70
65
60
55
95
90
85
80
75
70
65
60
55
1
2
4
6
8
10 12 14 16 18 20
1
2
4
6
8
10 12 14 16 18 20
Output current (A)
Output current (A)
Figure 3: Converter efficiency vs. output current
Figure 4: Converter efficiency vs. output current
(1.5V output voltage, 12V input)
(2.5V output voltage, 12V input)
95
90
85
80
75
70
65
60
55
95
90
85
80
75
70
65
60
55
1
2
4
6
8
10 12 14 16 18 20
1
2
4
6
8
10 12 14 16 18 20
Output current (A)
Output current (A)
Figure 5: Converter efficiency vs. output current
Figure 6: Converter efficiency vs. output current
(3.3V output voltage, 12V input)
(5.0V output voltage, 12V input)
Preliminary DS_NE12S20A_07272007
3
Download from Www.Somanuals.com. All Manuals Search And Download.
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
4
Download from Www.Somanuals.com. All Manuals Search And Download.
ELECTRICAL CHARACTERISTICS CURVES (CON.)
0
0
0
0
Figure 13: Turn on delay time at 12Vin, 0.59V/20A out
Figure 14: Turn on delay time Remote On/Off, 2.5V/20A out
Ch1: Vin, Ch4: Vout
Ch1: Enable, Ch4: Vout
0
0
0
0
Figure 15: Turn on delay time at 12Vin, 3.3V/20A out
Figure 16: Turn on delay time at Remote On/Off, 5.0V/20A out
Ch1: Vin, Ch4: Vout
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
Download from Www.Somanuals.com. All Manuals Search And Download.
DESIGN CONSIDERATIONS
FEATURES DESCRIPTIONS
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 resistor
from Trim pin to Ground.
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 output
will turn off if the ENABLE pin voltage is pulled below
0.3V
The converter can be turned ON/OFF by remote control
with positive on/off (ENABLE pin) logic. The converter
DC output is disabled when the signal is driven low
(below 0.3V). This pin is also used as the input turn on
threshold judgment. Its voltage is percent of Input
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 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 off
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 resistor
placed between the “Enable” pin and “Ground” pin.
The formula for calculating the value of this resistor is:
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.
50× (R +18.2)
VEN _ RTH
=
+1.5
18.2× R
Safety Considerations
VEN _ FTH = VEN _ RTH −1
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.
Enable
NE20A
R
Fig. 18. Enable POR circuit.
VEN _ FTH is the falling threshold
VEN _ RTH 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
6
Download from Www.Somanuals.com. All Manuals Search And Download.
Output Voltage Programming
FEATURES DESCRIPTIONS (CON.)
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.
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).
NE20A
Vin
Vout
Trim
NE20A
Enable
Vout
Vin
Rs
Enable
Ground
Trim
Ground
Ground
Ground
Figure 21: Trimming Output Voltage
Figure 19: Enable Input drive circuit for NE series
NE20A
The NE20 module has a trim range of 0.59V to 5.0V.
The trim resistor equation for the NE20A is:
Vout
Vin
Enable
Trim
1182
Rs(Ω) =
Vout − 0.591
Ground
Ground
Vout is the output voltage setpoint
Rs is the resistance between Trim and Ground
Rs values should not be less than 240Ω
Figure 20: Enable input drive circuit example with isolation.
Input Under-Voltage Lockout
Output Voltage
0.59V
Rs (Ω)
open
2.4k
1.3K
619
The input under-voltage lockout prevents the converter
from being damaged while operating when the input
voltage is too low. The lockout occurs between 3.3V to
4.3V.
+1 V
+1.5 V
+2.5 V
+3.3 V
+5.0V
436
Over-Current and Short-Circuit Protection
268
The NE 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.
Table 1: Typical trim resistor values
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
7
Download from Www.Somanuals.com. All Manuals Search And Download.
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.
Voltage Margining Adjustment
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 lower
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
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
Rmargin-down
NE20A
Vin
Vout
Ltest
Vin+
Load
DC-DC Converter
Trim
Cs
Enable
Ground
Cin
Rmargin-up
1uF
Ceramic
10uF
Tan
Rs
Output voltage ripple noise measurement point
Ground
Figure 22: Circuit configuration for output voltage margining
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
Paralleling
NE20 converters do not have built-in current sharing
(paralleling) ability. Hence, paralleling of multiple NE20
converter is not recommended.
Preliminary DS_NE12S20A_07272007
8
Download from Www.Somanuals.com. All Manuals Search And Download.
THERMAL CONSIDERATION
THERMAL CURVES (NE12S0A0V20)
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 25: Temperature measurement location* The allowed
maximum hot spot temperature is defined at 130℃
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current (A)
@Vin=12V Vout=5.0V (Through PWB Orientation)
20
18
16
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’’).
14
12
10
8
Natural
Convection
100LFM
200LFM
300LFM
400LFM
500LFM
600LFM
Thermal Derating
6
4
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.
2
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 26: Output current vs. ambient temperature and air
velocity @Vin=12V, Vout=5.0V (Through PWB Orientation)
PWB
FACING PWB
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current (A)
@Vin=12V Vout=2.5V (Through PWB Orientation)
20
18
MODULE
16
Natural
Convection
14
12
10
8
100LFM
200LFM
AIR VELOCITY
300LFM
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
400LFM
500LFM
50.8 (2.0”)
600LFM
AIR FLOW
6
4
11 (0.43”)
22 (0.87”)
2
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (
)
℃
Note: Wind tunnel test setup figure dimensions are in
Figure 27: Output current vs. ambient temperature and air
velocity@ Vin=12V, Vout=2.5V (Through PWB Orientation)
millimeters and (Inches)
Figure 24: Wind tunnel test setup
Preliminary DS_NE12S20A_07272007
9
Download from Www.Somanuals.com. All Manuals Search And Download.
THERMAL CURVES (NE12S0A0V20)
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current (A)
@Vin=5.0V Vout=2.5V (Through PWB Orientation)
20
18
16
Natural
100LFM
Convection
200LFM
300LFM
14
12
10
8
400LFM
500LFM
600LFM
6
4
2
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (
)
℃
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
Output Current (A)
@Vin=12V Vout=0.9V (Through PWB Orientation)
20
18
16
14
12
10
8
Natural
Convection
100LFM
200LFM
300LFM
400LFM
500LFM
6
4
2
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature
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
Output Current (A)
@Vin=5.0V Vout=0.9V (Through PWB Orientation)
20
18
16
Natural
Convection
100LFM
200LFM
300LFM
14
12
10
8
400LFM
6
4
2
0
25
30
35
40
45
50
55
60
65
70
75
80
85
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
10
Download from Www.Somanuals.com. All Manuals Search And Download.
MECHANICAL DRAWING
VERTICAL
HORIZONTAL
Preliminary DS_NE12S20A_07272007
11
Download from Www.Somanuals.com. All Manuals Search And Download.
PART NUMBERING SYSTEM
NE
12
S
0A0
V
20
P
N
F
A
Product
Series
Input
Voltage
Number of
outputs
Output
Current
ON/OFF
Logic
Pin
Length
Option
Code
Output Voltage Mounting
A-standard
function
NE-
12- 4.5~13.8V S- Single
output
0A0 - programmable V- Vertical
H- Horizontal
20-20A P- Positive N- 0.150” F- RoHS 6/6
N- Negative (Lead Free)
Non-isolated
Series
MODEL LIST
Efficiency
12Vin @ 100% load
Model Name
Packaging
Input Voltage
Output Voltage Output Current
NE12S0A0V20PNFA
NE12S0A0H20PNFA
Vertical
4.5V~ 13.8Vdc
4.5V~ 13.8Vdc
0.59V~ 5.1Vdc
0.59V~ 5.1Vdc
20A
20A
94.0%@5Vout
Horizontal
94.0%@5Vout
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
Asia & the rest of world:
Telephone: +886 3 4526107 ext. 6220
Fax: +886 3 4513485
Email: [email protected]
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.
Preliminary DS_NE12S20A_07272007
12
Download from Www.Somanuals.com. All Manuals Search And Download.
|