DATASHEET
DS_E48SR15004_10182013
FEATURES
High Efficiency: 91.5% @ 15V/4A
Size: 58.4mmx22.8mmx8.4mm
(2.30”x0.90”x0.33”)
Standard footprint
Industry standard pin out
Fixed frequency operation: 350KHz
Input UVLO, Output OCP, OVP, OTP
Basic insulation
No minimum load required
2:1 Input voltage range
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing
facility
UL/cUL 60950-1 (US & Canada)
recognized
APPLICATIONS
Telecom/Datacom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Testing Equipment
OPTIONS
Positive On/Off logic
Short pin lengths
SMD pin
Delphi Series E48SR, 66W Eighth Brick Family
DC/DC Power Modules: 48V in, 15V/4A out
The Delphi Series E48SR Eighth Brick, 48V input, single output,
isolated DC/DC converter is the latest offering from a world leader in
power systems technology and manufacturing — Delta Electronics, Inc.
This product family provides up to 66 watts of power or 25A of output
current (1.8V and below) in an industry standard footprint. With creative
design technology and optimization of component placement, these
converters possess outstanding electrical and thermal performances, as
well as extremely high reliability under highly stressful operating
conditions. All models are fully protected from abnormal input/output
voltage, current, and temperature conditions. The Delphi Series
converters meet all safety requirements with basic insulation.
DS_E48SR15004_10182013
2
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted)
.
PARAMETER
E48SR15004 (Standard)
Min.
Typ.
Max.
Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
80
Vdc
Transient (100ms)
100
Vdc
Operating Case Temperature
-40
106
°C
Storage Temperature
-55
125
°C
Input/Output Isolation Voltage
2250
Vdc
INPUT CHARACTERISTICS
Operating Input Voltage
36
75
Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold
33
34
35
Vdc
Turn-Off Voltage Threshold
31
32
33
Vdc
Lockout Hysteresis Voltage
1
2
3
Vdc
Maximum Input Current
2.2
A
No-Load Input Current
60
100
mA
Off Converter Input Current
4
10
mA
Inrush Current(I2t)
1
A2s
Input Reflected-Ripple Current
25
mA
Input Voltage Ripple Rejection
dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point
14.850
15.000
15.150
Vdc
Output Voltage Regulation
Over Load
±5
±15
mV
Over Line
±5
±15
mV
Over Temperature
±100
mV
Total Output Voltage Range
V
Output Voltage Ripple and Noise
Peak-to-Peak
80
120
mV
RMS
25
40
mV
Operating Output Current Range
0
4
A
Output DC Current-Limit Inception
110
140
%
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Positive Step Change in Output Current
150
320
mV
Negative Step Change in Output Current
150
320
mV
Settling Time (within 1% Vout nominal)
200
us
Turn-On Transient
Start-Up Time, From On/Off Control
6
12
ms
Start-Up Time, From Input
6
12
ms
Maximum Output Capacitance
1000
µF
EFFICIENCY
100% Load
91.5
%
60% Load
90.5
%
ISOLATION CHARACTERISTICS
Input to Output
2250
Vdc
Isolation Resistance
10
MΩ
Isolation Capacitance
1500
pF
FEATURE CHARACTERISTICS
Switching Frequency
350
kHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On)
0
0.7
V
Logic High (Module Off)
2
18
V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off)
0
0.7
V
Logic High (Module On)
2
18
V
ON/OFF Current (for both remote on/off logic)
1
mA
Leakage Current (for both remote on/off logic)
50
uA
Output Voltage Trim Range
13.05
16.95
V
Output Voltage Remote Sense Range
10
%
Output Over-Voltage Protection
17.25
21.75
V
GENERAL SPECIFICATIONS
MTBF
2.11
M hours
Weight
19.6
grams
Over-Temperature Shutdown
114
°C
DS_E48SR15004_10182013
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ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C
Figure 2: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 3: Typical full load input characteristics at room
temperature
DS_E48SR15004_10182013
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ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4: Turn-on transient at full rated load current (resistor
load) (2ms/div). Vin=48V. Top Trace: Vout, 5V/div; Bottom
Trace: ON/OFF input, 5V/div
Figure 5: Turn-on transient at zero load current (2ms/div).
Vin=48V.Top Trace: Vout, 5V/div; Bottom Trace: ON/OFF input,
5V/div
For Positive Remote On/Off Logic
Figure 6: Turn-on transient at full rated load current (resistor
load) (2ms/div). Vin=48V.Top Trace: Vout, 5V/div; Bottom
Trace: ON/OFF inpu, 5V/div
Figure 7: Turn-on transient at zero load current (2ms/div).
Vin=48V. Top Trace: Vout, 5V/div; Bottom Trace: ON/OFF input,
5V/div
0
0
0
0
0
0
0
0
DS_E48SR15004_10182013
5
ELECTRICAL CHARACTERISTICS CURVES
Figure 8: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (0.2V/div,200us/div), Bottom Trace: Iout (1A/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 9: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 2.5A/µs). Load cap:
47µF, 35m
ESR solid electrolytic capacitor and 1µF ceramic
capacitor. Top Trace: Vout (0.2V/div,,200us/div), Bottom Trace:
Iout (1A/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 (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown above
0
0
0
0
DS_E48SR15004_10182013
6
ELECTRICAL CHARACTERISTICS CURVES
Figure 11: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (500 mA/div,2us/div)
Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div,2us/div)
StripCopper
Vo(-)
Vo(+)
10u 1u SCOPE RESISTIVE
LOAD
Figure 13: Output voltage noise and ripple measurement test
setup
0
0
DS_E48SR15004_10182013
7
ELECTRICAL CHARACTERISTICS CURVES
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=4A)(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.
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points
0
DS_E48SR15004_10182013
8
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 10 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. Application notes to
assist designers in addressing these issues are pending
release.
Safety Considerations
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.
Basic insulation based on 75 Vdc input is provided
between the input and output of the module for the
purpose of applying insulation requirements when the
input to this DC-to-DC converter is identified as TNV-2
or SELV. An additional evaluation is needed if the
source is other than TNV-2 or SELV.
When the input source is SELV circuit, 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 input source must be insulated from the ac
mains by reinforced or double insulation.
The input terminals of the module are not operator
accessible.
If the metal baseplate is grounded, one Vi pin and
one Vo pin shall also be grounded.
A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure that under a single fault,
hazardous voltage does not appear at the module’s
output.
When installed into a Class II equipment (without
grounding), spacing consideration should be given to
the end-use installation, as the spacing between the
module and mounting surface have not been evaluated.
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
normal-blow fuse with 5A 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.
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.
DS_E48SR15004_10182013
9
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 (hiccup mode).
The modules 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.
Over-Voltage Protection
The modules include an internal output over-voltage
protection circuit, which monitors the voltage on the
output terminals. If this voltage exceeds the over-voltage
set point, the module will shut down (Hiccup mode).
The modules will try to restart after shutdown. If the fault
condition still exists, the module will shut down again.
This restart trial will continue until the fault condition is
corrected.
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.
The module will try to restart after shutdown. If the
over-temperature condition still exists during restart, the
module will shut down again. This restart trial will
continue until the temperature is within specification.
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 to floating.
Vo(+)Vi(+)
Vo(-)
Sense(-)
Sense(+)
Vi(-)
ON/OFF
Figure 16: Remote on/off implementation
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:
[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).
Vi(-)
Vi(+)
Vo(-)
Vo(+)
Sense(+)
Sense(-)
Resistance
Contact Contact and Di stribution
Losses
Figure 17: 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.
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.
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 does not exceed the maximum rated
power.
DS_E48SR15004_10182013
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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 18: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the TRIM
and SENSE (-) pins, the output voltage set point
decreases (Fig. 26). The external resistor value required
to obtain a percentage of output voltage change △% is
defined as:
KdownRtrim 2.10
511
Ex. When Trim-down -10%(15V×0.9=13.5V)
KKdownRtrim 9.402.10
10
511
Figure 19: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and SENSE (+) the output voltage set point increases
(Fig. 27). The external resistor value required to obtain a
percentage output voltage change △% is defined as:
K
Vo
upRtrim 2.10
511
225.1 )100(11.5
Ex. When Trim-up +10%(15 V×1.1=16.5V)
KupRtrim 0.6272.10
10
511
10225.1 )10100(1511.5
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.
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.
DS_E48SR15004_10182013
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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.
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’’).
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
12.7 (0.5”)
MODULE
AIR FLOW
50.8 (2.0”)
FACING PWB
PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Figure 20: Wind tunnel test setup
Thermal Derating
Heat can be removed by increasing airflow over the module.
The hottest point of the module is less than 106℃. 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.
THERMAL CURVES
Figure 21: Hot spot temperature measured point
＊
The allowed maximum hot spot temperature is defined at 106
℃
E48SR15004(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Transverse Orientation)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
50 55 60 65 70 75 80 85
Ambient Temperature (℃)
Output Current(A)
Natural
Convection
100LFM
200LFM
300LFM
400LFM
Figure 22: Output current vs. ambient temperature and air
velocity@Vin=48V(Transverse Orientation)
DS_E48SR15004_10182013
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PICK AND PLACE LOCATION SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)
DS_E48SR15004_10182013
13
LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Note: The temperature refers to the pin of E48SR, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
Temp.
Time
150℃
200℃
100~140 sec.
Time Limited 90 sec.
above 217℃
217℃
Preheat time
Ramp up
max. 3℃/sec.
Ramp down
max. 4℃/sec.
Peak Temp. 240 ~ 245 ℃
25℃
Note: The temperature refers to the pin of E48SR, measured on the pin +Vout joint.
DS_E48SR15004_10182013
14
MECHANICAL DRAWING
Surface-mount module Through-hole module
Pin No.
Name
Function
1
2
3
4
5
6
7
8
+Vin
ON/OFF
-Vin
-Vout
-SENSE
TRIM
+SENSE
+Vout
Positive input voltage
Remote ON/OFF
Negative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
Positive remote sense
Positive output voltage
DS_E48SR15004_10182013
15
PART NUMBERING SYSTEM
E
48
S
R
150
04
N
R
F
A
Type of
Product
Input
Voltage
Number of
Outputs
Product
Series
Output
Voltage
Output
Current
ON/OFF
Logic
Pin Length
Option Code
E- Eighth
Brick
48V
S- Single
Feature
150-15V
04-4A
N- Negative
(Default)
P- Positive
R - 0.170”
(Default)
N - 0.145”
K - 0.110”
M - SMD pin
F- RoHS 6/6
( Lead Free)
A-Standard
Functions
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
E48SR1R225NRFA
36V~75V
1.3A
1.2V
25A
88.0%
E48SR1R525NRFA
36V~75V
1.5A
1.5V
25A
89.5%
E48SR1R825NRFA
36V~75V
1.8A
1.8V
25A
90.5%
E48SR2R520NRFA
36V~75V
1.9A
2.5V
20A
89.0%
E48SR3R320NRFA
36V~75V
2.5A
3.3V
20A
90.5%
E48SR05012NRFA
36V~75V
2.1A
5.0V
12A
91.5%
E48SR12005NRFA
36V~75V
2.2A
12V
5A
92.0%
E48SR12006NRFA
36V~75V
2.6A
12V
6A
92.5%
E48SR12007NRFA
36V~75V
3.0A
12V
7A
92.0%
E48SR15004NRFA
36V~75V
2.2A
15V
4A
92.0%
Default remote on/off logic is negative and pin length is 0.170”
For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales
office.
CONTACT: www.deltaww.com/dcdc
USA:
Telephone:
East Coast: 978-656-3993
West Coast: 510-668-5100
Fax: (978) 656 3964
Email: DCDC@delta-corp.com
Europe:
Telephone: +31-20-655-0967
Fax: +31-20-655-0999
Email: DCDC@delta-es.com
Asia & the rest of world:
Telephone: +886 3 4526107 x 6220~6224
Fax: +886 3 4513485
Email: DCDC@delta.com.tw
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.
Mouser Electronics
Authorized Distributor
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