FEATURES
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Input voltage range: 38V~55V
Output 240W @ 44Vin and above
Output 22.3A @ 44Vin and below
High efficiency: 96.3% @ 12V/20A
Size: 58.4mm x 22.8mm x 11.4mm
(2.28” x 0.90” x 0.45”)
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Industry standard pinout
Fully protected: Input UVLO, OVP, Output
OCP and OTP
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Parallelable for higher output power
2250V isolation
Basic insulation
Monotonic startup
No minimum load required
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
UL/cUL 60950 (US & Canada) Recognized,
and TUV (EN60950) Certified
CE mark meets 73/23/EEC and 93/68/EEC
directives
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Delphi Series E48SB, 240W Eighth Brick Bus Converter
DC/DC Power Modules: 48Vin, 12V/20A out
OPTIONS
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Positive On/Off logic
Delta Electronics, Inc., a world leader in power systems technology and
manufacturing, has introduced the E48SB, eighth brick sized 240W
bus converter, into their Delphi Series of board mounted DC/DC power
converters to support the intermediate bus architecture to power multiple
downstream non-isolated point-of-load (POL) converters. The E48SB
product family features an input voltage of 38V to 55V, and provides up to
240W (9.6V and above) of power in an industry standard eighth brick
footprint. Typical efficiency of 12V module is 96.3%. With optimized
component placement, creative design topology, and numerous patented
technologies, the E48SB bus converters deliver outstanding electrical
and thermal performance. An optional heatsink is available for harsh
thermal requirements.
Short pin lengths
Heatsink available for extended
operation
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OTP and OCP mode (Auto restart or
latch)
APPLICATIONS
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Datacom / Netowrking
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial / Testing Equipment
DATASHEET
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ELECTRICAL CHARACTERISTICS CURVES
10
8
97
96
95
94
93
6
4
38Vin
48Vin
55Vin
92
91
90
38Vin
48Vin
55Vin
2
0
0
3
6
9
12
15
18
21
24
3
6
9
12
15
18
21
24
Output Current (A)
Output Current (A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
Figure 2: Power loss vs. load current for minimum, nominal,
maximum input voltage at 25°C
and maximum input voltage at 25°C.
14
12
10
8
23.00
22.00
21.00
20.00
19.00
18.00
17.00
6
4
2
38Vin
48Vin
55Vin
0
3
6
9
12
15
18
21
24
27
38
40
42
44
46
48
50
52
54
56
Output Current (A)
Vin (V)
Figure 3: Output voltage regulation vs load current showing
typical current limit curves and converter shutdown points for
minimum, nominal, and maximum input voltage at room
temperature.
Figure 4: Max output current vs input voltage.
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ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 5: Turn-on transient at full rated load current
(5 ms/div). Top Trace: Vout; 5V/div; Bottom Trace: ON/OFF
input: 2V/div
Figure 6: Turn-on transient at zero load current (5 ms/div). Top
Trace: Vout: 5V/div; Bottom Trace: ON/OFF input: 2V/div
For Positive Remote On/Off Logic
Figure 7: Turn-on transient at full rated load current
(5 ms/div). Top Trace: Vout; 5V/div; Bottom Trace: ON/OFF
input: 2V/div
Figure 8: Turn-on transient at zero load current (5 ms/div). Top
Trace: Vout: 5V/div; Bottom Trace: ON/OFF input: 2V/div
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ELECTRICAL CHARACTERISTICS CURVES
Figure 9: Output voltage response to step-change in load
current (50%-75%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (200mV/div, 200us/div), Bottom Trace: Iout (10A/div).
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 10: Output voltage response to step-change in load
current (50%-75%-50% of Io,max; di/dt=1A/µs). Load cap:
10uF, tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (200mV/div, 200us/div), Bottom Trace: Iout (10A/div).
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 11: 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. Measure current as shown below
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ELECTRICAL CHARACTERISTICS CURVES
Figure 12: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 47µF electrolytic capacitor (100 mA/div, 2us/div).
Figure 13: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div, 20us/div).
Copper Strip
Vo(+)
SCOPE
RESISTIVE
LOAD
10u
1u
Vo(-)
Figure 14: Output voltage noise and ripple measurement test
setup.
Figure 15: Output voltage ripple at nominal input voltage and
rated load current (50 mV/div, 2us/div). Load capacitance: 1µF
ceramic capacitor and 10µF tantalum capacitor. Bandwidth: 20
MHz. Scope measurements 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.
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DESIGN CONSIDERATIONS
Input Source Impedance
Test Result
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 220μF electrolytic
capacitor (ESR < 0.5 Ω at 100 kHz) mounted close to
the input of the module to improve the stability.
Test result is in compliance with CISPR 22 class B, which
is shown as below:
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 example of
using Delta latest FL75L10 A input filter tested with
E48SB12020 to meet class B in CISSPR 22.
Vin=48V, Io=20A, average mode
Soldering and Cleaning Considerations
Schematic and Components List
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.
E48SB12020
Series
C2
C1
Vin
FL75L10 A
C3
FEATURES DESCRIPTIONS
Over-Current Protection
C1 is 100uF/100V, low ESR Aluminum cap;
C2 is 2.2uF ceramic cap;
C3 is 4.7nF ceramic capacitor;
The modules include an internal output over-current
protection circuit, which will endure current limiting for
an unlimited duration during output overload. If the
output current exceeds the OCP set point, the modules
will automatically shut down, and enter in hiccup mode
or latch mode, which is optional.
FL75L10 A is Delta input EMI filter module.
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.
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.
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Over-Temperature Protection
The over-temperature protection consists of circuitry that
provides protection from thermal damage. If the
temperature exceeds the over-temperature threshold, the
module will be shut down, and enter in the auto-restart
mode or latch mode, which is optional.
For auto-restart mode, the module will monitor the
module temperature after shutdown. Once the
temperature of module is decreased by an OTP hystersis
that is about 30°C, the module will auto-restart.
For latch mode, the module will latch off once it shutdown.
Either cycling the input power or toggling the on/off signal
for one second can reset the latch.
Remote On/Off
The remote on/off feature on the module can be either
negative or positive logic. Negative logic turns the module
on during logic low and off during logic high. Positive logic
turns the modules on during logic high and off during
logic low.
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.
For negative logic if the remote on/off feature is not
used, please short the on/off pin to Vi(-). For positive
logic if the remote on/off feature is not used, please
leave the on/off pin floating.
Vo(+)
Vi(+)
R
ON/OFF
Vi(-)
Load
Vo(-)
Figure 16: Remote on/off implementation
Current Sharing
The modules are designed to operate in parallel without
the use of any external current share circuitry. For
design assistance with Parallel and related PWB layout
issues, please contact Delta’s technical support team.
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THERMAL CURVES
THERMAL CONSIDERATIONS
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 18: Temperature measurement location
The allowed maximum hot spot temperature is defined at 128℃
E48SB12020(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@Vin = 48V (Transverse Orientation)
22
20
18
16
14
12
10
8
500LFM
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’’).
Natural
Convection
100LFM
200LFM
300LFM
400LFM
6
PWB
FACING PWB
4
2
MODULE
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (
)
℃
Figure 19: Output current vs. ambient temperature and air
velocity@Vin=48V (Transverse Orientation)
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
AIR FLOW
12.7 (0.5”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 17: Wind tunnel test setup
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.
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MECHANICAL DRAWING
Pin No.
Name
Function
1
2
3
4
+Vin
ON/OFF
-Vin
-Vout
+Vout
Positive input voltage
Remote ON/OFF
Negative input voltage
Negative output voltage
Positive output voltage
5
Pin Specification:
Pins 1-3 1.0mm (0.040”) diameter
Pins 4-5 1.5mm (0.060”) diameter
All pins are copper with Tin plating (Pb free)
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PART NUMBERING SYSTEM
E
Type of
Product
E- Eighth
Brick
48
S
B
120
20
N
R
F
A
Input Number of Product
Output
Voltage
120- 12V
Output
Current
20- 20A
ON/OFF Pin Length
Logic
Option Code
Voltage Outputs
Series
48-
S- Single B- Bus
N- Negative
(Default)
R- 0.170” F- RoHS 6/6 A- OCP, OTP hiccup
(Default) (Lead Free) B- OCP, OTP
38V~55V
Converter
P- Positive
N- 0.145”
K- 0.110””
latch-up
MODEL LIST
MODEL NAME
E48SB9R625NRFA
E48SB12020NRFA
INPUT
38V~55V
OUTPUT
25A
EFF @ 100% LOAD
6.5A
6.5A
9.6V
12V
240W
240W
96.5%
38V~55V
20A
96.3%
Note:
1. Default remote on/off logic is negative;
2. Default Pin length is 0.170”;
3. Default OTP and output OVP, OCP mode is auto-restart.
4. For different option, please refer to part numbering system above or contact your local sales office.
USA:
Europe:
Asia & the rest of world:
Telephone:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: [email protected]
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
Email: [email protected]
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
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.
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