Datasheet

FEATURES
Š
High Efficiency:
94.0% @ 12Vin, 5V/20A out
Š
Size:
Vertical: 30.5x15.5x12.0mm
(1.20”x0.61”x0.47”)
Horizontal: 30.5x15.5x12.9mm
(1.20”x0.61”x0.51”)
Š
Wide input range: 4.5V~13.8V
Š
Output voltage programmable from
0.59Vdc to 5.1Vdc via external resistors
Š
Voltage and resistor-based trim
Š
No minimum load required
Š
Fixed frequency operation
Š
Input UVLO, output OCP
Š
Remote ON/OFF (Positive)
Š
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
Š
UL/cUL 60950-1 (US & Canada)
Recognized
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
Š
Vertical or horizontal versions
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
APPLICATIONS
of load solution. With creative design technology and optimization of
Š
DataCom
component placement, these converters possess outstanding
electrical and thermal performance, as well as extremely high
Š
Distributed power architectures
Š
Servers and workstations
reliability under highly stressful operating conditions.
Š
LAN/WAN applications
Š
Data processing applications
DATASHEET
DS_NE12S20A_08042011
TECHNICAL SPECIFICATIONS
(Ambient Temperature=25°C, minimum airflow=200LFM, nominal Vin=12Vdc unless otherwise specified.)
PARAMETER
NOTES and CONDITIONS
NE12S0A0V/H20
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Temperature (Vertical)
Storage Temperature
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 Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Adjustment Range
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over temperature
Total output range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Output Current Range
Output Voltage Under-shoot at Power-Off
Output short-circuit current, RMS value
Output DC Current-Limit Inception
DYNAMIC CHARACTERISTICS
Output 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 power
Minimum Output Capacitance
5.0Vo,Maximum Output Capacitance
EFFICIENCY
Vo=0.59V
Vo=0.9V
Vo=2.5V
Vo=5.0V
SINK EFFICIENCY
Vo=5.0V
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control
Logic High
Logic Low
GENERAL SPECIFICATIONS
Calculated MTBF
Weight
operation
Refer to Fig.25 for the measuring point
Max.
Units
4.5
-40
-55
13.8
130
125
Vdc
°C
°C
4.5
13.8
V
4.3
3.3
1.0
8.9
150
10
30
60
12Vin, 5Vo, operating, full load
Vin=12V, Vout=5V
Remote OFF
P-P thru 2uH inductor 5Hz to 20MHz
120Hz
With a 0.1% trim resistor
Io=Io_min to Io_max
Vin=Vin_min to Vin_max
Ta=0°C to 70°C
Over load, line, temperature regulation and set point
5Hz to 20MHz bandwidth
Full Load, 10uF Tan cap, 12Vin, 5Vo
Full Load, 10uF Tan cap, 12Vin, 5Vo
Typ.
0.59
-1
5.1
+1
V
%Vo
-0.5
-0.2
-0.3
-2.0
+0.5
+0.2
+0.3
+2.0
%Vo
%Vo
%Vo
%Vo
20
100
mV
mV
A
mV
A
%Iomax
20
5
0
Vin=12V, Turn OFF
Continuous
Hiccup mode
V
V
V
A
mA
mA
mA
dB
3.6
110
12Vin, 2.5Vout, 10µF ceramic cap
75~100% load , 5A/uS
100~75% load , 5A/uS
Settling to be within regulation band (to 10% Vo deviation)
200
200
200
100
From Enable high to 90% of Vo
From Vin=12V to 90% of Vo
2
2
mV
mV
µs
3
3
Turn on overshoot <1% vo ,ESR≥1mΩ
2000
ms
ms
µF
µF
Vin=12V,
Vin=12V,
Vin=12V,
Vin=12V,
75
80.5
91
94
%
%
%
%
Vin=12V, Io=20A
92
%
Fixed
Positive logic (internally pulled high)
Module On (or leave the pin open)
Module Off
500
KHz
0
Io=20A
Io=20A
Io=20A
Io=20A
25℃, 300LFM, 80% load
0.8
0
5.0
0.3
9.8
8.8
V
V
Mhours
grams
DS_NE12S20A_08042011
2
95
95
90
90
85
85
Efficiency (%)
Efficiency (%)
ELECTRICAL CHARACTERISTICS CURVES
80
75
70
65
80
75
70
65
60
60
55
55
1
2
4
6
8
10
12
14
16
18
1
20
2
4
6
Figure 1: Converter efficiency vs. output current
(0.59V output voltage, 12V input)
12
14
16
18
20
18
20
18
20
Figure 2: Converter efficiency vs. output current
(0.9V output voltage, 12V input)
95
95
90
90
85
85
Efficiency (%)
Efficiency (%)
10
Output current (A)
Output current (A)
80
75
70
65
60
80
75
70
65
60
55
55
1
2
4
6
8
10
12
14
16
18
20
1
2
4
6
Output current (A)
8
10
12
14
16
Output current (A)
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)
95
95
90
90
85
85
Efficiency (%)
Efficiency (%)
8
80
75
70
65
80
75
70
65
60
60
55
55
1
2
4
6
8
10
12
14
Output current (A)
Figure 5: Converter efficiency vs. output current
(3.3V output voltage, 12V input)
16
18
20
1
2
4
6
8
10
12
14
16
Output current (A)
Figure 6: Converter efficiency vs. output current
(5.0V output voltage, 12V input)
DS_NE12S20A_08042011
3
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
DS_NE12S20A_08042011
4
ELECTRICAL CHARACTERISTICS CURVES (CON.)
0
0
0
0
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
0
0
0
0
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
DS_NE12S20A_08042011
5
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 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 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.
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 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:
50 × ( R + 18.2)
+ 1.5
18.2 × R
= VEN _ RTH − 1
VEN _ RTH =
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.
VEN _ FTH
Enable
NE20A
R
Fig. 18. Enable POR circuit.
V EN _ 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
DS_NE12S20A_08042011
6
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).
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.
ND
6A/10A
NE20A
Vin
Trim
ND6A/10A
NE20A
Vin
Vout
Enable
Vout
Rs
Enable
Trim
Ground
Ground
Ground
Ground
Figure 21: Trimming Output Voltage
Figure 19: Enable Input drive circuit for NE series
NDNE20A
6A/10A
Vin
Enable
Ground
Vout
Trim
Ground
Figure 20: Enable input drive circuit example with isolation.
The NE20 module has a trim range of 0.59V to 5.0V.
The trim resistor equation for the NE20A is:
Rs(Ω) =
1182
Vout − 0.591
Vout is the output voltage setpoint
Rs is the resistance between Trim and Ground
Rs values should not be less than 240Ω
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 3.3V to
4.3V.
Over-Current and Short-Circuit Protection
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.
Output Voltage
Rs (Ω)
0.59V
+1 V
+1.5 V
+2.5 V
+3.3 V
+5.0V
open
2.9k
1.3K
619
436
268
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.
DS_NE12S20A_08042011
7
FEATURES DESCRIPTIONS (CON.)
Output Capacitance
Voltage Margining Adjustment
There is internal output capacitor on the NE series
modules. Hence, no external output capacitor is required
for stable operation.
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
ND
6A/10A
NE20A
Vin
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.
Rmargin-down
Input reflected current measurement point
Vout
Ltest
DC-DC Converter
Vin+
Load
Trim
Enable
Rmargin-up
Cs
Cin
1uF
Ceramic
Rs
Ground
Ground
10uF
Tan
Output voltage ripple noise measurement point
Figure 22: Circuit configuration for output voltage margining
Cs=270µF*1, Ltest=2uH, Cin=270µF*1
Paralleling
Figure 23: Input reflected ripple/ capacitor ripple current and
output voltage ripple and noise measurement setup for NE20
NE20 converters do not have built-in current sharing
(paralleling) ability. Hence, paralleling of multiple NE20
converter is not recommended.
DS_NE12S20A_08042011
8
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
@Vin=12V Vout=5.0V (Through PWB Orientation)
Output Current (A)
20
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’’).
18
16
Natural
Convection
14
100LFM
200LFM
12
300LFM
400LFM
10
500LFM
8
Thermal Derating
600LFM
6
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.
4
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
@Vin=12V Vout=2.5V (Through PWB Orientation)
Output Current (A)
MODULE
20
18
16
Natural
Convection
14
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
100LFM
200LFM
300LFM
12
50.8 (2.0”)
400LFM
500LFM
10
600LFM
8
AIR FLOW
6
4
11 (0.43”)
22 (0.87”)
2
0
25
Note: Wind tunnel test setup figure dimensions are in
millimeters and (Inches)
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 27: Output current vs. ambient temperature and air
velocity@ Vin=12V, Vout=2.5V (Through PWB Orientation)
Figure 24: Wind tunnel test setup
DS_NE12S20A_08042011
9
THERMAL CURVES (NE12S0A0V20)
NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=5.0V Vout=2.5V (Through PWB Orientation)
Output Current (A)
20
18
16
Natural
Convection
14
100LFM
200LFM
300LFM
400LFM
12
500LFM
10
600LFM
8
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
@Vin=12V Vout=0.9V (Through PWB Orientation)
Output Current (A)
20
18
Natural
Convection
16
100LFM
14
200LFM
300LFM
400LFM
12
500LFM
10
8
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
@Vin=5.0V Vout=0.9V (Through PWB Orientation)
Output Current (A)
20
18
16
Natural
Convection
100LFM
14
200LFM
300LFM
12
400LFM
10
8
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)
DS_NE12S20A_08042011
10
MECHANICAL DRAWING
VERTICAL
HORIZONTAL
DS_NE12S20A_08042011
11
PART NUMBERING SYSTEM
NE
12
Product
Series
Input
Voltage
S
0A0
Number of
Output Voltage
outputs
NE12- 4.5~13.8V S- Single
Non-isolated
output
Series
V
20
P
N
Mounting
Output
Current
ON/OFF
Logic
Pin
Length
0A0 - programmable V- Vertical
20-20A
P- Positive N- 0.150”
N- Negative
F
A
Option
Code
F- RoHS 6/6 A-standard
function
(Lead Free)
MODEL LIST
Model Name
Packaging
Input Voltage
Output Voltage
Output Current
Efficiency
12Vin @ 100% load
NE12S0A0V20PNFA
Vertical
4.5V~ 13.8Vdc
0.59V~ 5.1Vdc
20A
[email protected]
CONTACT: www.delta.com.tw/dcdc
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
Email: [email protected]
Asia & the rest of world:
Telephone: +886 3 4526107
Ext. 6220~6224
Fax: +886 3 4513485
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.
DS_NE12S20A_08042011
12