Page 1
FEATURES
High efficiency: 96.5% @ 9.6V/25A
Size: 58.4mm x 22.8mm x 11.4mm
(2.30” x 0.90” x 0.45”)
Industry standard pinout
Fully protected: Input UVLO, OVP, Output
OCP and OTP
240W constant power output
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
Delphi Series E48SB, 240W Eighth Brick Bus Converter
DC/DC Power Modules: 48Vin, 9.6V/25A out
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 9.6V module is 96.5%. 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.
OPTIONS
Positive On/Off logic
Short pin lengths
Heatsink available for extended
operation
OTP and OCP mode (Auto re-restart or
latch)
APPLICATIONS
Datacom / Netowrking
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Testing Equipment
DATASHEET
DS_E48SB9R625_05222008
Page 2
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS E48SB9R625 (Standard)
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 60 Vdc
Operating Temperature Refer to Figure 17 for the measuring point, Tc -40 117 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 38 48 55 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 35 36.5 38 Vdc
Turn-Off Voltage Threshold 33 34.5 36 Vdc
Lockout Hysteresis Voltage 1 2 3 Vdc
Input Over-Voltage Lockout
Turn-Off Voltage Threshold 58 60 62 Vdc
Turn-On Voltage Threshold 57 58.5 60 Vdc
Lockout Hysteresis Voltage 1 1.5 2.5 Vdc
Maximum Input Current 38V Vin , 100% Load 6.65 A
No-Load Input Current 80 120 mA
Off Converter Input Current 7 15 mA
Inrush Current (I2t) 0.03 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 15 25 mA
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=no load, Ta=25°C 9.5 Vdc
Output Voltage Regulation
Over Load Io=Io,min to Io,max 300 400 mV
Over Line Vin=38V to 55V 3.4 3.6 V
Over Temperature Tc=-40°C to 100°C 200 mV
Total Output Voltage Range Over sample load, line and temperature 7.0 11 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 100 150 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 25 40 mV
Operating Output Power Range Full input voltage range 0 240 W
Output DC Powert-Limit Inception Full input voltage range 110% 140% W
Current share accuracy (2 units in parallel) % of rated output current 10 %
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient 48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
Positive Step Change in Output Current 50% Io.max to 75% Io.max 80 150 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 80 150 mV
Settling Time (within 1% Vout nominal) 90 120 us
Turn-On Transient
Start-Up Time, From On/Off Control 8 15 25 ms
Start-Up Time, From Input 15 20 30 ms
Maximum Output Capacitance 3000 µF
EFFICIENCY
100% Load Vin=48V 96.5 %
60% Load Vin=48V 96.0 %
ISOLATION CHARACTERISTICS
Input to Output 2250 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1000 pF
FEATURE CHARACTERISTICS
Switching Frequency 130 kHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On) Von/off -0.7 0.8 V
Logic High (Module Off) Von/off 2 18 V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off) Von/off -0.7 0.8 V
Logic High (Module On) Von/off 2 18 V
ON/OFF Current (for both remote on/off logic) Ion/off at Von/off=0.0V 0.25 0.3 mA
Leakage Current (for both remote on/off logic) Logic High, Von/off=15V 30 uA
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C 1.86 M hours
Weight 31.76 grams
Over-Temperature Shutdown Refer to Figure 17 for the measuring point, Tc 122 °C
Min. Typ. Max. Units
DS_E48SB9R625_05222008
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ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C
12
11
10
9
8
7
6
5
4
Output Voltage(V)
3
2
1
0
0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45
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 .
38Vin
48Vin
55Vin
Output Current(A)
Figure 2: Power loss vs. load current for minimum, nominal,
and maximum input voltage at 25°C.
DS_E48SB9R625_05222008
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ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Turn on Waveform
0
0
Figure 4: Turn-on transient at full rated load current
(5 ms/div). Top Trace: Vout; 5V/div; Bottom Trace: ON/OFF
input: 2V/div
For Vin Input Turn on Waveform
0
0
0
Figure 5: Turn-on transient at zero load current (5 ms/div). Top
Trace: Vout: 5V/div; Bottom Trace: ON/OFF input: 2V/div
0
0
Figure 6: Turn-on transient at full rated load current
(5 ms/div). Top Trace: Vout; 5V/div; Bottom Trace: Vin;
50V/div.
DS_E48SB9R625_05222008
0
Figure 7: Turn-on transient at zero load current (5 ms/div). Top
Trace: Vout: 5V/div; Bottom Trace: Vin; 50V/div.
4
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ELECTRICAL CHARACTERISTICS CURVES
)
0
0
Figure 8: 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 (100mV/div, 100us/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.
0
0
Figure 9: 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, 100us/div), Bottom Trace: Iout (5A/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: 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 (L
possible battery impedance. Measure current as shown below
of 12 μH. Capacitor Cs offset
TEST
DS_E48SB9R625_05222008
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ELECTRICAL CHARACTERISTICS CURVES
E
0
Figure 11: Input Terminal Ripple Current, i
current and nominal input voltage with 10µH source impedance
and 47µF electrolytic capacitor (200 mA/div, 2us/div).
Copper Strip
Vo(+)
10u 1u
, at full rated output
c
SCOPE RESISTIV
LOAD
0
Figure 12: Input reflected ripple current, i
source inductor at nominal input voltage and rated load current
(20 mA/div, 2us/div).
, through a 10µH
s
0
Vo(-)
Figure 13: Output voltage noise and ripple measurement test
setup.
DS_E48SB9R625_05222008
Figure 14: 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 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.
6
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DESIGN CONSIDERATIONS
Input Source Impedance
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.
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. Application notes to assist
designers in addressing these issues are pending
release.
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.
FEATURES DESCRIPTIONS
Over-Current Protection
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 hiccup mode or latch
mode, which is optional.
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.
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 shut down, and enter in 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 is within the specification, the module will
be auto-restart.
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 On/Off
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.
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(+)
Vo(+)
Vi(+)
Vi(+)
Vi(+)
ON/OFF
ON/OFF
ON/OFF
Vi(-)
Vi(-)
Vi(-)
Vo(+)
Vo(-)
Vo(-)
Vo(-)
R
R
Load
Load
Figure 15: Remote on/off implementation
DS_E48SB9R625_05222008
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DESIGN CONSIDERATIONS
Current Sharing
The modules are capable of operating in parallel without
any external current sharing circuitry.
For a normal parallel operation, the following
precautions must be observed:
1. The current sharing accuracy calculation equation is:
Current sharing accuracy=((I
Where, I
=Total load current;
load
I= Output current of per converter;
I
=Converter’s rated output current at different Vin;
rated
n=the numberous of parallel modules
2. The maximum load current for N converters is
I
=(1-X%)*N*I
max
Where, X% is current sharing load accuracy.
This unit has been tested with up to 2 units in
parallel.
3. To ensure a better steady current sharing accuracy,
below design guideline should be followed:
a) The inputs of the converters must be connected to the
same voltage source
b) The PCB trace resistance from Input voltage source to
Vin+ and Vin- of each converter should be as equalize as
possible.
c) The PCB trace resistance from each converter’s
output to the load should be equalized as much as
possible.
4. To ensure a better transient current sharing, and the
monotonic startup of the parallel module
a) The ON/OFF pin of the converters should be
connected together to keep the parallel modules start up
at the approximately same time.
b) The under voltage lockout point will slightly vary from
unit to unit. The dv/dt of the rising edge of the input
source voltage must be greater than 1V/ms to ensure
that the parallel can start up at the approximately same
time.
/n)-I)*100%)/I
load
.
rated
I
is 100% load for different Vin
rated
rated
DS_E48SB9R625_05222008
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Page 9
THERMAL CONSIDERATIONS
A
Y
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.
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 CURVES
Figure 17: Temperature measurement location
The allowed maximum hot spot temperature is defined at 117
Output Cur rent(A)
25
20
15
10
E48SB9R625(Standard) Output Current vs. Ambient Temperature and Air Velocity
Natural
Convection
100LF M
@Vin = 48V ( Transverse Orientation)
200LFM
300LF M
400LFM
500LFM
℃
FACING PWB
AIR VELOCIT
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
PWB
MODULE
50.8 (2.0”)
IR FLOW
12.7 (0.5”)
Figure 16: 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.
5
0
50 55 60 6 5 70 75 80 85
Ambient Temperature (℃)
Figure 18: Output current vs. ambient temperature and air
velocity@V
=48V (Transverse Orientation).
in
DS_E48SB9R625_05222008
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Page 10
MECHANICAL DRAWING
Pin No. Name Function
1
2
3
4
5
+Vin
ON/OFF
-Vin
-Vout
+Vout
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)
DS_E48SB9R625_05222008
Positive input voltage
Remote ON/OFF
Negative input voltage
Negative output voltage
Positive output voltage
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PART NUMBERING SYSTEM
E 48 S B 9R6 25 N R F A
Type of
Product
E- Eighth
Brick
Input
Voltage
48- 38V~55V S- Single B- Bus
Number of
Outputs
Product
Series
Converter
Output
Voltage
9R6- 9.6V 25- 25A N- Negative
Output
Current
ON/OFF
Logic
P- Positive
Pin Length Option Code
R- 0.170”
N- 0.145”
K- 0.110”
F- RoHS 6/6
(Lead Free)
A - OCP, OTP
B - OCP, OTP
latch-up
C - Latching OCP
MODEL LIST
MODEL NAME INPUT OUTPUT EFF @ 100% LOAD
E48SB9R625NRFA 38V~55V 6.65A 9.6V 25A 240W 96.5%
E48SB9R625PRFC 38V~55V 6.65A 9.6V 25A 240W 96.5%
E48SB12020NRFA 38V~55V 6.5A 12V 20A 240W 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.
hiccup
and Non-latching
OTP
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: DCDC@delta-corp.com
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
.
Europe:
Telephone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: DCDC@delta-es.tw
Asia & the rest of world:
Telephone: +886 3 4526107 x 6220
Fax: +886 3 4513485
Email: DCDC@delta.com.tw
DS_E48SB9R625_05222008
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