FEATURES
Š
High efficiency: 93.2% @ 12V/ 25A
Š
Standard footprint: 58.4 x 61.0 x 11.2 mm
(2.30” x2.40”x0.44”)
Š
Š
Š
Š
Š
Š
Industry standard pin out
Single board construction
Fixed frequency operation
2250V Isolation
Basic insulation
Monotonic startup into normal and pre-
bias loads
Š
Fully protected: input UVLO, output OVP,
OCP, OTP
Š
Š
Š
No minimum load required
Wide output trim range: -20%, +10%
ISO 9001, TL 9000, ISO 14001, QS
9000, OHSAS 18001 certified
manufacturing facility
Š
Š
UL/cUL 60950-1 (US & Canada)
Recognized, and TUV (EN60950-1)
Certified
CE mark meets 73/23/EEC and
93/68/EEC directives
Delphi Series H48SA, Half Brick Family
DC/DC Power Modules: 48V in, 12V/25A out
The Delphi Series H48SA Half Brick, 48V input, single output, isolated,
open frame DC/DC converters are the latest offering from a world
leader in power systems technology and manufacturing — Delta
Electronics, Inc. This product family provides up to 300 watts of power
or up to 25A of output current in an industry standard footprint. This
product represents the next generation of design technology required
by today’s leading-edge circuitry. 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. Typical
efficiency of the 12V, 300W module is better than 93.2% and all
modules are fully protected from abnormal input/output voltage, current
and temperature conditions. The Delphi Series converters meet all
safety requirements with basic insulation. A variety of optional
heatsinks are available for extended thermal operation.
OPTIONS
Š
Positive on/off
Š
Heatspreader available for extended
operation
APPLICATIONS
Š
Š
Š
Š
Š
Telecom / DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial / Test Equipment
DATASHEET
DS_H48SA12025_05052008
1
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ELECTRICAL CHARACTERISTICS CURVES
95
30
25
20
15
10
5
90
75Vin
75Vin
85
48Vin
48Vin
36Vin
80
36Vin
75
70
65
60
0
0
5
10
15
20
25
5
10
15
20
25
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
Figure 2: Power dissipation vs. load current for minimum,
maximum input voltage at 25°C. Vout=12V.
nominal, and maximum input voltage at 25°C. Vout=12V.
95
90
30
25
75Vin
85
75Vin
48Vin
20
48Vin
36Vin
80
15
10
5
36Vin
75
70
65
60
0
0
5
10
15
20
25
5
10
15
20
25
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Figure 3: Efficiency vs. load current for minimum, nominal, and
Figure 4: Power dissipation vs. load current for minimum,
maximum input voltage at 25°C. Vout=9.6V.
nominal, and maximum input voltage at 25°C. Vout=9.6V.
3
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DS_H48SA12025_05052008
ELECTRICAL CHARACTERISTICS CURVES
95
30
25
20
15
10
5
90
75Vin
75Vin
85
80
75
70
65
60
48Vin
48Vin
36Vin
36Vin
0
0
5
10
15
20
25
5
10
15
OUTPUT CURRENT (A)
20
25
OUTPUT CURRENT (A)
Figure 5: Efficiency vs. output voltage for minimum, nominal,
and maximum input voltage at 25°C, Vout=13.2V.
Figure 6: Power dissipation vs. output voltage for minimum,
nominal, and maximum input voltage at 25°C, Vout=13.2V.
12
10
8
6
4
2
0
30.0 31.3 33.6 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0
Output Current (A)
Figure 7: Typical input characteristics at room temperature.
Figure 8: Turn-on transient at full rated load current, 4ms/div:
Top Trace: Vout, 5V/div; Bottom Trace: ON/OFF input, 5V/div.
4
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DS_H48SA12025_05052008
ELECTRICAL CHARACTERISTICS CURVES
0
0
Figure 9: Turn-on transient at zero load current, 4 ms/div;
Top Trace: Vout, 5V/div; Bottom Trace: ON/OFF input,
5V/div.
Figure 10: Output voltage response to step-change in load
current, 200mV/div, 200us/div. 75%-50%-75% of Io, max, di/dt =
0.1A/µs. Load cap: 10µF, tantalum capacitor and 1µF ceramic
capacitor.
Scope measurement should be made using a BNC cable (length
shorter than 20 inches). Position the load between 51 mm to 76
mm (2 inches to 3 inches) from the module..
is
ic
Vin+
+
+
Vin-
Cs: 220uF
100uF,
ESR=0.2 ohm @
25oC 100KHz
Figure 11: Output voltage response to step-change in load
current, 200mV/div, 1ms/div. 75%-50%-75% of Io, max, di/dt
= 1A/µs. Load cap: 5000µF tantalum capacitor and 1µF
ceramic capacitor.
Scope measurement should be made using a BNC cable
(length shorter than 20 inches). Position the load between
51 mm to 76 mm (2 inches to 3 inches) from the module..
Figure 12: Test set-up diagram showing measurement points for
Input Terminal Ripple Current and Input Reflected Ripple Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measured current as shown below.
5
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DS_H48SA12025_05052008
ELECTRICAL CHARACTERISTICS CURVES
0
0
Figure 13: Input Terminal Ripple Current, ic, at nominal input
voltage and rated load current with 12µH source impedance
and 100µF electrolytic capacitor, 500 mA/div, 2us/div.
Figure 14: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current,
20 mA/div, 2us/div.
Copper Strip
Vo(+)
SCOPE
RESISTIVE
LOAD
10u
1u
0
Vo(-)
Figure 15: Output voltage noise and ripple measurement
test setup
Figure 16: Output voltage ripple at nominal input voltage and
rated load current, 50mV/div, 2us/div. Load capacitance: 1µF
ceramic capacitor and 10µF tantalum capacitor. Bandwidth: 20
MHz. Scope measurement should be made using a BNC cable
(length shorter than 20 inches). Position the load between 51
mm to 76 mm (2 inches to 3 inches) from the module.
12
10
8
6
4
2
0
0
5
10
15
20
25
30
35
Output Current (A)
Figure 17: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
6
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DS_H48SA12025_05052008
DESIGN CONSIDERATIONS
Safety Considerations
Input Source Impedance
The power module must be installed in compliance with
the spacing and separation requirements of the end-
user’s safety agency standard, i.e., UL60950,
CAN/CSA-C22.2 No. 60950-00 and EN60950:2000 and
IEC60950-1999, if the system in which the power
module is to be used must meet safety agency
requirements. When the input source is 60 Vdc or
below, the power module meets SELV (safety extra-low
voltage) requirements. If the input source is a
hazardous voltage which is greater than 60 Vdc and
less than or equal to 75 Vdc, for the module’s output to
meet SELV requirements, all of the following must be
met:
The impedance of the input source connecting to the
DC/DC power modules will interact with the modules
and affect the stability. A low ac-impedance input
source is recommended. If the source inductance is
more than a few μH, we advise adding a 33 to 100 μF
electrolytic capacitor (ESR < 0.7 Ω at 100 kHz)
mounted close to the input of the module to improve the
stability.
Layout and EMC Considerations
Delta’s DC/DC power modules are designed to operate
in a wide variety of systems and applications. For
design assistance with EMC compliance and related
PWB layout issues, please contact Delta’s technical
support team. An external input filter module is
available for easier EMC compliance design. Below is
the reference design for an input filter tested with
H48SA12025NN A to meet class B in CISSPR 22.
Š
The input source must be insulated from any
hazardous voltages, including the ac mains, with
reinforced insulation.
Š
Š
Š
Š
One Vi pin and one Vo pin are grounded, or all the
input and output pins are kept floating.
The input terminals of the module are not operator
accessible.
Schematic and Components List
If the metal baseplate is grounded the output must
be also grounded.
+
Vin(+) Vo(+)
H48SA12025
Vin(-) Vo(-)
CY1
CY1
CX
CX1
Cin
Vin
LOAD
L1
L2
A SELV reliability test is conducted on the system
where the module is used to ensure that under a
single fault, hazardous voltage does not appear at
the module’s output.
-
CY
Do not ground one of the input pins without grounding
one of the output pins. This connection may allow a
non-SELV voltage to appear between the output pin
and ground. The power module has extra-low voltage
(ELV) outputs when all inputs are ELV. This power
module is not internally fused. To achieve optimum
safety and system protection, an input line fuse is highly
recommended. The safety agencies require a fuse with
30A maximum rating to be installed in the ungrounded
lead. A lower rated fuse can be used based on the
maximum inrush transient energy and maximum input
current.
CX is 4.7uF ceramic cap;
CX1 is 4.7uF ceramic cap;
CY is 3.3nF ceramic cap;
CY1 is 4.7nF ceramic cap;
L1 is common-mode inductor, L1=0.08mH;
L2 is common-mode inductor, L1=0.24mH;
Test Result
Test result is in compliance with CISPR 22 class B, which
is shown as below:
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly
process before the board or system undergoes
electrical testing. Inadequate cleaning and/or drying
may lower the reliability of a power module and
severely affect the finished circuit board assembly test.
Adequate cleaning and/or drying is especially important
for un-encapsulated and/or open frame type power
modules. For assistance on appropriate soldering and
cleaning procedures, please contact Delta’s technical
support team.
Vin=48V, Io=25A,
Yellow line is quasi peak mode;
Blue line is average mode.
7
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DS_H48SA12025_05052008
FEATURES DESCRIPTIONS
Remote on/off can be controlled by an external switch
between the on/off terminal and the Vi(-) terminal. The
switch can be an open collector or open drain.
Over-Current Protection
The modules include an internal output over-current
protection circuit. If the output current exceeds the OCP
set point, the modules will automatically shut down, and
enter hiccup mode or latch mode, which is optional.
Vi(+)
Vo(+)
Sense(+)
Trim
ON/OFF
Vi(-)
R
For hiccup mode, the module will try to restart after
shutdown. If the overload condition still exists, the
module will shut down again. This restart trial will
continue until the overload condition is corrected.
Hiccup mode is default mode.
Sense(-)
Vo(-)
Distribution resistor
Figure 18: Remote on/off implementation
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
Remote Sense
Remote sense compensates for voltage drops on the
output by sensing the actual output voltage at the point
of load. The voltage between the remote sense pins
and the output terminals must not exceed the output
voltage sense range given here:
Over-Voltage Protection
The modules include an internal output over-Voltage
protection circuit. If the output voltage exceeds the OVP
set point, the modules will automatically shut down, and
enter hiccup mode or latch mode, which is optional.
[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% × Vout
This limit includes any increase in voltage due to
remote sense compensation and output voltage set
point adjustment (trim).
For hiccup mode, the module will try to restart after
shutdown. If the over-voltage condition still exists, the
module will shut down again. This restart trial will
continue until the over-voltage condition is corrected.
Hiccup mode is default mode.
Vi(+)
Vo(+)
Sense(+)
Trim
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
ON/OFF
Vi(-)
R
Sense(-)
Vo(-)
Over-Temperature Protection
Distribution resistor
The over-temperature protection consists of circuitry
that provides protection from thermal damage. If the
temperature exceeds the over-temperature threshold
the module will shut down, and enter in auto-restart
mode or latch mode, which is optional.
Figure 19: Effective circuit configuration for remote sense
operation
If the remote sense feature is not used to regulate the
output at the point of load, please connect SENSE(+)
to Vo(+) and SENSE(–) to Vo(–) at the module.
For auto-restart mode, the module will monitor the
module temperature after shutdown. Once the
temperature is within the specification, the module will
be auto-restarted. Auto-restart mode is default mode.
The output voltage can be increased by both the
remote sense and the trim; however, the maximum
increase is the larger of either the remote sense or the
trim, not the sum of both.
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
When using remote sense and trim, the output voltage
of the module is usually increased, which increases the
power output of the module with the same output
current.
Remote On/Off
Care should be taken to ensure that the maximum
output power does not exceed the maximum rated
power.
The remote on/off feature on the module can be either
negative or positive logic. Negative logic turns the
module on during a logic low and off during a logic high.
Positive logic turns the modules on during a logic high
and off during a logic low.
8
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DS_H48SA12025_05052008
FEATURES DESCRIPTIONS (CON.)
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point,
the modules may be connected with an external
resistor between the TRIM pin and either the
SENSE(+) or SENSE(-). The TRIM pin should be left
open if this feature is not used.
Figure 21: Circuit configuration for trim-down (decrease output
voltage)
If the external resistor is connected between the TRIM
and SENSE (-) the output voltage set point decreases
(Fig. 21). The external resistor value required to obtain a
percentage of output voltage change △% is defined as:
100
⎛
⎝
⎞
⎠
Rtrim_down
− 2 kΩ
Figure 20: Circuit configuration for trim-up (increase output
voltage)
Δ
Ex. When trim down to 9.6V from 12V
Δ = 100*(12-9.6)/12 = 20
If the external resistor is connected between the TRIM
and SENSE (+) pins, the output voltage set point
increases (Fig. 20). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
100
(
− 2)
kΩ
Rtrim_down =
20
Rtrim_down = 3 kΩ
12
⎡⎛
⎞
⎠
⎤
(
)
− 2 ⋅ 100 + Δ + 100
The typical resistor value can be seen in below figure22.
⎢
⎥
1.225
⎝
Rtrim_up
kΩ
⎣
⎦
Δ
Output voltage
Resistor value ( kΩ )
13.2V
12.6V
10.8V
9.6V
95.8
183.7
8.0
Ex. When trim up to 13.2V from 12V
Δ = 100*(13.2-12)/12 = 10
3.0
12
⎡⎛
⎞
⎠
⎤
− 2 ⋅(100 + 10) + 100
Figure 22: Trim resistor value example for popular output
voltages
⎢
⎥
1.225
⎝
Rtrim_up
kΩ
⎣
10
⎦
The output voltage can be increased by both the remote
sense and the trim, however the maximum increase is the
larger of either the remote sense or the trim, not the sum
of both.
Rtrim_up = 95.755 kΩ
I
When using remote sense and trim, the output voltage of
the module is usually increased, which increases the
power output of the module with the same output current.
Care should be taken to ensure that the maximum output
power of the module remains at or below the maximum
rated power.
9
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DS_H48SA12025_05052008
THERMAL CONSIDERATIONS
Thermal Derating
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.
Heat can be removed by increasing airflow over the
module. The module’s maximum device temperature is to
be defined and the measured location is illustrated in
Figure 24. 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.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Thermal Testing Setup
PWB
FACING PWB
MODULE
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.
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
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’’).
AIR FLOW
12.7 (0.5”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 23: Wind tunnel test setup
10
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DS_H48SA12025_05052008
THERMAL CURVES
H48SA12025(Standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
Output Current (A)
600LFM
25
20
15
10
5
500LFM
Natural
Convection
100LFM
200LFM
300LFM
400LFM
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=48V, Vout=12V(Openframe Version, Either
Orientation).
Figure 24: Temperature measurement location for openframe
version - The allowed maximum hot spot temperature is
defined at 122℃.
H48SA12025(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation,With Heatspreader)
Output Current (A)
25
20
15
10
5
Natural
Convection
100LFM
200LFM
300LFM
400LFM
500LFM
600LFM
0
25
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=48V, Vout=12V(Heatspreader version, Either
Orientation).
Figure 25: Temperature measurement location for heatspreader
version - The allowed maximum hot spot temperature is defined
at 109℃.
11
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DS_H48SA12025_05052008
MECHANICAL DRAWING (WITHOUT HEATSPREADER)
Pin No. Name
Function
1
2
3
4
5
6
7
8
9
+Vin
Positive input voltage
Remote ON/OFF
ON/OFF
CASE
-Vin
-Vout
-SENSE
TRIM
Case pin
Negative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
Positive remote sense
Positive output voltage
+SENSE
+Vout
Notes:
Pins 1-4, 6-8 are 1.00mm (0.040”) diameter
Pins 5 and 9 are 2.00mm (0.079”) diameter
All pins are copper with Tin plating.
1
2
3
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DS_H48SA12025_05052008
MECHANICAL DRAWING (WITH HEATSPREADER)
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DS_H48SA12025_05052008
PART NUMBERING SYSTEM
H
48
S
A
120
25
N
N
F
A
Form
Input Number of Product
Output
Output
ON/OFF
Pin
Option Code
Factor Voltage Outputs
Series
Voltage Current
Logic
Length
N - 0.145”
H - Half-
Brick
48V
S- Single A - Advanced 120- 12V
25- 25A N - Negative
P - Positive
A - Standard Functions
H - with Heatspreader
F- RoHS 6/6
(Lead Free)
MODEL LIST
Part Number
INPUT
OUTPUT
EFF @ 100% LOAD
H48SA12025NNFA
36V~75V
11A
12V
25A
93.2%
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Asia & the rest of world:
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: [email protected]
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.
14
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DS_H48SA12025_05052008
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