Delta Electronics E48SR12007 User Manual

FEATURES

 High efficiency: 92.0% @ 12V/7A

 Size: 58.4mmx22.80mmx8.4mm

(2.30”x0.90”x0.33”)

 Standard footprint

 Industry standard pin out

 2:1 Input voltage range

 Fixed frequency operation

 Input UVLO, Output OCP, OVP, OTP

 2250V isolation and basic insulation

 No minimum load required

 ISO 9001, TL 9000, ISO 14001, QS9000,

OHSAS18001 certified manufacturing

facility

 UL/cUL 60950-1 (US & Canada)

recognized, and TUV (EN60950-1)

certified

 CE mark meets 73/23/EEC and

93/68/EEC directive

Delphi Series E48SR12007, 84W Eighth Brick

DC/DC Power Modules: 48V in, 12V/7A out

The Delphi Series E48SR12007 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 provides 84 watts of power with 92.0% efficiency in

an industry standard footprint. With creative design technology and

optimization of component placement, this converter possesses

outstanding electrical and thermal performances, as well as extremely

high reliability under highly stressful operating conditions.

E48SR models are fully protected from abnormal input/output voltage,

current, temperature conditions and also meet all safety requirements

with basic insulation.

All Delphi

OPTIONS

 Positive On/Off logic

 Short pin lengths

 SMD pin

APPLICATIONS

 Telecom/Datacom

 Wireless Networks

 Optical Network Equipment
 Server and Data Storage

 Industrial/Test Equipment

DATASHEET
DS_E48SR12007_05222008

TECHNICAL SPECIFICATIONS

(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)

PARAMETER NOTES and CONDITIONS E48SR12007 (Standard)

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous 80 Vdc
Transient (100ms) 100ms 100 Vdc

Operating Temperature Refer to Figure21 for measuring point -40 115 °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 100% Load, 36Vin 3.0 A
No-Load Input Current 60 100 mA
Off Converter Input Current 3 10 mA
Inrush Current (I2t) 1 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 25 mA
Input Voltage Ripple Rejection 120 Hz 50 dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 11.880 12.000 12.120 Vdc
Output Voltage Regulation

Over Load Io=Io,min to Io,max ±10 ±15 mV

Over Line Vin=36V to 75V ±10 ±15 mV

Over Temperature Tc=-40°C to 85°C ±100 mV
Total Output Voltage Range Over sample load, line and temperature 11.76 12.24 Vdc
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 40 120 mV

RMS Full Load, 1µF ceramic, 10µF tantalum 10 25 mV
Operating Output Current Range 0 7 A
Output Over Current Protection 110 140 %

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 200 360 mV

Negative Step Change in Output Current 75% Io.max to 50% Io.max 200 360 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 Full load; 5% overshoot of Vout at startup 2000 µF

EFFICIENCY

100% Load 92.0 %
60% Load 92.0 %

ISOLATION CHARAC TERISTICS

Input to Output 2250 Vdc
Isolation Resistance 100 MΩ
Isolation Capacitance 1500 pF

FEATURE CHARACTERISTICS

Switching Frequency 350 kHz
ON/OFF Control, Negative Remote On/Off logic

Logic Low (Module On) Von/off at Ion/off=1.0mA 0 0.7 V

Logic High (Module Off) Von/off at Ion/off=0.0 µA 2.4 18 V
ON/OFF Control, Positive Remote On/Off logic

Logic Low (Module Off) Von/off at Ion/off=1.0mA 0 0.7 V

Logic High (Module On) Von/off at Ion/off=0.0 µA 2.4 18 V

ON/OFF Current (for both remote on/off logic) Ion/off at Von/off=0.0V 0.7 1 mA

Leakage Current (for both remote on/off logic) Logic High, Von/off=15V 50 uA
Output Voltage Trim Range
Output Voltage Remote Sense Range
Output Over-Voltage Protection Over full temp range; 14.4 V

GENERAL SPECIFICATIONS

MTBF Io=80% of Io, max; Ta=25°C, airflow rate=200FLM 2.03 M hours
Weight 19.6 Grams
Over-Temperature Shutdown Refer to Figure 21 for measuring point 120 °C

Min. Typ. Max. Units

Pout ≦ max rated power
Pout ≦ max rated power

-10 10 %
10 %

E48SR12007_05222008

2

ELECTRICAL CHARACTERISTICS CURVES

Figure 1: Efficiency vs. load current for minimum, nominal, and

maximum input voltage at 25°C, 300LFM airflow.

Figure 3: Typical full load input characteristics at 25°C

Figure 2: Power dissipation vs. load current for minimum,

nominal, and maximum input voltage at 25°C, 300LFM airflow.

E48SR12007_05222008

3

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

For Positive Remote On/Off Logic

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

Figure 6: Turn-on transient at full rated load current (resistor

load) (2ms/div) for positive on/off mode. Vin=48V. Top Trace:
Vout, 5V/div; Bottom Trace: ON/OFF input, 5V/div

E48SR12007_05222008

Figure 7: Turn-on transient at zero load current (2ms/div) for

positive on/off mode. Vin=48V. Top Trace: Vout, 5V/div; Bottom
Trace: ON/OFF input, 5V/div

4

ELECTRICAL CHARACTERISTICS CURVES

A

)

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 (1
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

/div). Scope

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
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

Ω

ESR solid electrolytic capacitor and 1µF ceramic

0

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. Measured current as shown below

of 12 μH. Capacitor Cs offset

TEST

Figure 11: Input Terminal Ripple Current, i

current and nominal input voltage with 12µH source impedance

and 33µF electrolytic capacitor (500 mA/div, 2us/div)

, at full rated output

c

E48SR12007_05222008

5

ELECTRICAL CHARACTERISTICS CURVES

)

StripCopper

Vo(+)

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 12µH

s

10u

SCOPE RESISTIV

1u

LOAD

Vo(-)

Figure 13: Output voltage noise and ripple measurement test

setup

14

12

10

8

6

OUTPUT VOLTAGE (V

4

Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=7A)(20 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.

E48SR12007_05222008

2

0

012345678910

48V

LOAD CURRENT (A)

Figure 15: Output voltage vs. load current showing typical

current limit curves and converter shutdown points

6

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
to 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 10A 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.

E48SR12007_05222008

7

FEATURES DESCRIPTIONS

n

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 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.

E48SR12007_05222008

Vo(+)Vi(+)

Sense(+)

ON/OFF

Sense(-)

Vi(-)

Vo(-)

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% × Vo ut

This limit includes any increase in voltage due to
remote sense compensation and output voltage set
point adjustment (trim).

Vi(+)

Vo(+)

Sense(+)

Sense(-)

Vi(-)

Contact

Resistance

Vo(-)

Contact and Distributio

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.

8

FEATURES DESCRIPTIONS (CON.)

Δ

×

×

×

×

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. 18). The external resistor value required
to obtain a percentage of output voltage change △% is

defined as:

511

⎡
⎢

⎣

⎡
⎢

⎣

Δ

511

10

−

−=− KKdownRtrim 88.4022.10

=− KdownRtrim 22.10

Ex. When Trim-down -10%(12V×0.9=10.8V)

⎤

()

Ω

⎥
⎦

⎤

() ()

⎥
⎦

Ω=Ω

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. 19). The external resistor value required obtaining a
percentage output voltage change △% is defined as:

=− K

upRtrim 22.10

Ex. When Trim-up +10%(12 V×1.1=13.2V)

=− KupRtrim 3.48922.10

Vo

225.1

Δ+××

)100(11.5

511

−
Δ

+

511

)10100(1211.5

10225.1

10

()

Ω−

()

Ω=−−

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.

E48SR12007_05222008

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’’).

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”)

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.

THERMAL CURVES

Figure 21: Hot spot temperature measured point

＊

The allowed maximum hot spot temperature is defined at 115℃

Output Current(A)

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0
20 25 30 35 40 45 50 55 60 65 70 75 80 85

E48SR12007(Standard) Output Current vs. Ambient Temperature and Air Velocity

Natural

Convection

@Vin = 48V (Transverse Orientation)

100LFM

200LFM

300LFM

400LFM

500LFM

Ambient Temperature (

)

℃

Figure 22: Output current vs. ambient temperature and air

velocity@Vin=48V (Transverse Orientation)

Figure 20: Wind tunnel test setup

E48SR12007_05222008

10

PICK AND PLACE LOCATION SURFACE-MOUNT TAPE & REEL

RECOMMENDED PAD LAYOUT (SMD)

E48SR12007_05222008

11

℃

LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE

Peak temp.

210~230°C 5sec.

Cooling down rate <3°C /sec.

Over 200°C

40~50sec.

300 60 0 120 180 240

Temperature (°C )

250

150

100

50

Ramp-up temp.

0.5~3.0°C /sec.

2nd Ramp-up temp.

Pre-heat temp.

140~180°C 60~120 sec.

Time ( sec. )

1.0~3.0°C /sec.

Note: The temperature refers to the pin of E48SR, measured on the pin +Vout joint.

LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE

217℃

℃

200

.

Peak Temp. 240 ~ 245

Ramp down
max. 4℃/sec.

Temp

150

℃

Ramp up
max. 3℃/sec.

Preheat time

100~140 sec.

Time Limited 90 sec.
above 217

℃

25℃

Time

Note: The temperature refers to the pin of E48SR, measured on the pin +Vout joint.

E48SR12007_05222008

12

MECHANICAL DRAWING (WITHOUT HEATSPREADER)

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

E48SR12007_05222008

13

MECHANICAL DRAWING (WITH HEATSPREADER)

THROUGH-HOLE MODULE

E48SR12007_05222008

14

PART NUMBERING SYSTEM

E 48 S R 120 07 N R F A

Type of

Product

E- Eighth

Brick

Input

Voltage

48V S- Single R- Regular 120-12V 07- 7A N- Negative

Number of

Outputs

Product

Series

Output

Voltage

Output

Current

ON/OFF

Logic

(Default)

P- Positive

Pin Length Option Code

R - 0.170”

(Default)

N - 0.145”

K - 0.110”

M - SMD pin

F- RoHS 6/6

(Lead Free)

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.

A - Standard

Functions

(Default)

H - with Heat

Spreader

CONTACT: www.delta.com.tw/dcdc

USA:

Telephone:
East Coast: [phone]
West Coast: [phone]
Fax: [phone]
Email: [e-mail]

Europe:

Phone: [phone]
Fax: [phone]
Email: [e-mail]

Asia & the rest of world:

Telephone: [phone] ext 6220
Fax: [phone]
Email: [e-mail]

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

.

E48SR12007_05222008

15