E48SR1R525

FEATURES

High Efficiency: 89.5% @ 1.5V/25A

Size: 58.4mm x 22.8mm x 8.4mm
(2.30”x0.90”x0.33”)

Industry standard pin out

SMT and through-hole versions

Fixed frequency operation: 350KHz

Input UVLO, Output OCP, OVP, OTP

1500V isolation

Basic insulation

No minimum load required

2:1 Input voltage range

ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS 18001 certified manufacturing
facility

UL/cUL 60950-1 (US & Canada)
recognized
Delphi Series E48SR, 66W Eighth Brick Family
DC/DC Power Modules: 48V in, 1.5V/25A out
OPTIONS
The Delphi Series E48SR Eighth Brick, 48V input, single output,
 SMT or through-hole versions
isolated DC/DC converters are the latest offering from a world leader in
 Positive On/Off logic
power systems technology and manufacturing — Delta Electronics, Inc.
 Short pin lengths available
This product family is available in a surface mount or through-hole
package and 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
APPLICATIONS
safety requirements with basic insulation.

Telecom/Datacom

Wireless Networks

Optical Network Equipment

Server and Data Storage

Industrial/Test Equipment
DATASHEET
DS_E48SR1R525_10182013
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
NOTES and CONDITIONS
E48SR1R525 (Standard)
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Transient (100ms)
Operating Case Temperature
Storage Temperature
Input/Output Isolation Voltage
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Input Over-Voltage Lockout
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Maximum Input Current
No-Load Input Current
Off Converter Input Current
Inrush Current(I2t)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time (within 1% Vout nominal)
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
Maximum Output Capacitance
EFFICIENCY
100% Load
60% Load
ISOLATION CHARACTERISTICS
Input to Output
Input to Case
Output to Case
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On)
Logic High (Module Off)
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off)
Logic High (Module On)
ON/OFF Current (for both remote on/off logic)
Leakage Current (for both remote on/off logic)
Output Voltage Trim Range
Output Voltage Remote Sense Range
Output Over-Voltage Protection
GENERAL SPECIFICATIONS
MTBF
Weight
Over-Temperature Shutdown
DATASHEET
DS_E48SR1R525_10182013
100ms
Refer to fig. 21 for the measuring point
Typ.
-40
-55
36
Max.
Units
75
100
107
+125
1500
Vdc
Vdc
°C
°C
Vdc
75
Vdc
33
31
1.5
34
32
2
35
33
2.5
Vdc
Vdc
Vdc
100
97
105
102
107
104
1.2
Vdc
Vdc
A
mA
mA
A2s
mA
dB
100% Load, 36Vin
40
4
1
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Vin=48V, Io=Io.max, Tc=25°C
Io=Io,min to Io,max
Vin=36V to 75V
Tc=-40°C to 85°C
Over sample load, line and temperature
5Hz to 20MHz bandwidth
Full Load, 1µF ceramic, 10µF tantalum
Full Load, 1µF ceramic, 10µF tantalum
Output Voltage 10% Low
15
TBD
1.477
1.5
1.523
Vdc
±3
±3
±15
±10
±10
1.530
mV
mV
mV
V
75
20
25
150
mV
mV
A
%
1.470
40
8
0
110
48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
50% Io.max to 75% Io.max
75% Io.max to 50% Io.max
80
80
150
mV
mV
us
6
6
ms
ms
µF
Full load; 5% overshoot of Vout at startup
15000
89.5
89.0
%
%
1500
Vdc
Vdc
Vdc
MΩ
pF
350
kHz
1500
10
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
Ion/off at Von/off=0.0V
Logic High, Von/off=15V
Across Pins 9 & 5, Pout ≦ max rated power
Pout ≦ max rated power
Over full temp range; % of nominal Vout
Io=80% of Io, max; Tc=40°C
Refer to Fig. 21 for the measuring point
0.7
18
V
V
0.7
18
1
50
10%
10
2
V
V
mA
uA
%
%
V
3
19.6
119
M hours
grams
°C
2
2
-10%
2
95
5.0
90
4.5
85
4.0
48Vin
3.5
36Vin
80
POWER DISSIPATION (W)
EF FI CIENCY (%)
ELECTRICAL CHARACTERISTICS CURVES
36Vin
75
70
48Vin
65
75Vin
60
75Vin
3.0
2.5
2.0
1.5
55
1.0
50
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
OUTPUT CURRENT(A)
OUTPUT CURRENT(A)
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.
1.4
INPUT CURRENT(A)
1.2
1
0.8
0.6
0.4
0.2
0
30
35
40
45
50
55
60
65
70
75
INPUT VOLTAGE(V)
Figure 3: Typical full load input characteristics at room
temperature
DATASHEET
DS_E48SR1R525_10182013
3
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
0
0
0
0
Figure 4: Turn-on transient at full rated load current (constant
current load) (1 ms/div). Vin=48V. Top Trace: Vout, 0.5V/div;
Bottom Trace: ON/OFF input, 2V/div
Figure 5: Turn-on transient at zero load current (1 ms/div).
Vin=48V. Top Trace: Vout, 0.5V/div; Bottom Trace: ON/OFF
input, 2V/div
For Positive Remote On/Off Logic
0
0
0
0
Figure 6: Turn-on transient at full rated load current (constant
current load) (1 ms/div). Vin=48V. Top Trace: Vout, 0.5V/div;
Bottom Trace: ON/OFF input, 5V/div
DATASHEET
DS_E48SR1R525_10182013
Figure 7: Turn-on transient at zero load current (1 ms/div).
Vin=48V. Top Trace: Vout, 0.5V/div; Bottom Trace: ON/OFF
input, 5V/div
4
ELECTRICAL CHARACTERISTICS CURVES
0
0
0
0
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 (50mV/div, 200us/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 9: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 2.5A/µs). Load cap:
470µF, 35m ESR solid electrolytic capacitor and 1µF ceramic
capacitor. Top Trace: Vout (50mV/div, 200us/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 (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown above
DATASHEET
DS_E48SR1R525_10182013
5
ELECTRICAL CHARACTERISTICS CURVES
0
0
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)
Copper
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)
Strip
Vo(+)
10u
1u
SCOPE
RESISTIVE
LOAD
Vo(-)
Figure 13: Output voltage noise and ripple measurement test
setup
DATASHEET
DS_E48SR1R525_10182013
6
ELECTRICAL CHARACTERISTICS CURVES
1.6
OUTPUT VOLTAGE (V)
1.4
0
1.2
1.0
0.8
0.6
0.4
0.2
Vin=48
V
0.0
0
5
10
15
20
25
30
35
LOAD CURRENT (A)
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=25A)(10 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
DATASHEET
DS_E48SR1R525_10182013
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
7
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:
DATASHEET
DS_E48SR1R525_10182013

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 20A 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
are
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.
8
FEATURES DESCRIPTIONS
Vi(+)
Vo(+)
Over-Current Protection
Sense(+)
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
ON/OFF
Sense(-)
Vi(-)
Figure 24: 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).
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.
Vo(-)
Vi(+)
Vo(+)
Sense(+)
Sense(-)
Vi(-)
Contact
Resistance
Vo(-)
Contact and Distribution
Losses
Figure 25: 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.
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.
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 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.
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.
DATASHEET
DS_E48SR1R525_10182013
9
FEATURES DESCRIPTIONS (CON.)
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point,
connect 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 27: Circuit configuration for trim-up (increase output
voltage)
Figure 26: Circuit configuration for trim-down (decrease
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:
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:
Rtrim  up 
5.11 Vo  (100  ) 511

 10.2K 
1.225  

Ex. When Trim-up +10%(1.5V×1.1=1.65V)
5.11 1.5  (100  10) 511

 10.2  7.53K 
1.225  10
10
 511

Rtrim  down  
 10.2 K 


Rtrim  up 
Ex. When Trim-down -10%(1.5V×0.9=1.35V)
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.
 511

Rtrim  down  
 10.2 K   40.9K 
10


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.
DATASHEET
DS_E48SR1R525_10182013
10
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.
Thermal Derating
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Heat can be removed by increasing airflow over the
module. The hottest point temperature of the module is
+107°C. 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 Testing Setup
THERMAL CURVES
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’’).
Figure 21: Hot spot temperature measured point
＊The allowed maximum hot spot temperature is defined at 107 ℃
PWB
FACING PWB
Output Current(A)
MODULE
E48SR1R525(Standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Transverse Orientation)
25
Natural
Convection
20
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
100LFM
15
200LFM
50.8 (2.0”)
10
300LFM
AIR FLOW
5
12.7 (0.5”)
0
55
60
65
70
75
80
85
Ambient Temperature (℃)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 28: Wind tunnel test setup
DATASHEET
DS_E48SR1R525_10182013
Figure 22: Output current vs. ambient temperature and air
velocity@Vin=48V(Transverse Orientation)
11
PICK AND PLACE LOCATION
SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)
DATASHEET
DS_E48SR1R525_10182013
12
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.
Peak Temp. 240 ~ 245 ℃
217℃
Ramp down
max. 4℃/sec.
200℃
150℃
Preheat time
100~140 sec.
Time Limited 90 sec.
above 217℃
Ramp up
max. 3℃/sec.
25℃
Time
Note: The temperature refers to the pin of E48SR, measured on the pin +Vout joint.
DATASHEET
DS_E48SR1R525_10182013
13
MECHANICAL DRAWING
Surface-mount module
Pin No.
1
2
3
4
5
6
7
8
Name
+Vin
ON/OFF
-Vin
-Vout
-SENSE
TRIM
+SENSE
+Vout
DATASHEET
DS_E48SR1R525_10182013
Through-hole module
Function
Positive input voltage
Remote ON/OFF
Negative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
Positive remote sense
Positive output voltage
14
PART NUMBERING SYSTEM
E
48
S
R
1R5
25
N
R
Type of
Product
Input
Voltage
Number of
Outputs
Product
Series
Output
Voltage
Output
Current
ON/OFF
Logic
Pin
Length/Type
E - Eighth
Brick
48V
S - Single
R- Regular
1R5 - 1.5V
25 - 25A
N- Negative
(Default)
P- Positive
R - 0.170”
(Default)
F
A
Option Code
A - Standard
Functions
F- RoHS 6/6
(Lead Free)
N - 0.145”
K - 0.110”
M - SMD pin
MODEL LIST
MODEL NAME
E48SR1R225NRFA
E48SR1R525NRFA
E48SR1R825NRFA
E48SR2R520NRFA
E48SR3R320NRFA
E48SR05012NRFA
E48SR12005NRFA
E48SR12007NRFA
E48SR15004NRFA
INPUT
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
OUTPUT
1.3A
1.5A
1.8A
1.9A
2.5A
2.1A
2.2A
3.0A
2.2A
1.2V
1.5V
1.8V
2.5V
3.3V
5.0V
12V
12V
15V
EFF @ 100% LOAD
25A
25A
25A
20A
20A
12A
5A
7A
4A
88.0%
89.5%
90.5%
89.0%
90.5%
91.5%
92.0%
93.0%
91.5%
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
CONTACT: www.deltaww.com/dcdc
USA:
Telephone:
East Coast: 978-656-3993
West Coast: 510-668-5100
Fax: (978) 656 3964
Email: [email protected]
Europe:
Phone: +31-20-655-0967
Fax: +31-20-655-0999
Email: [email protected]
Asia & the rest of world:
Telephone: +886 3 4526107 x 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.
DATASHEET
DS_E48SR1R525_10182013
15