Delta Electronics V48SR User Manual

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Delphi Series V48SR, 1/16th Brick 66W

DC/DC Power Modules: 48V in, 15V, 4.4A out

The Delphi Series V48SR, 1/16th Brick, 48V input, single output, isolated

DC/DC converter, is the latest offering from a world leader in powe

systems technology and manufacturing ― Delta Electronics, Inc. This

product family provides up to 66 watts of power or 25A of output curren

(1.8V and below) in an industry standard 1/16thbrick form factor (1.30”

0.90”). The 15V output offers one of the highest output currents available

and provides up to 90.5% efficiency at full load. With creative design

technology and optimization of component placement, these converters

possess outstanding electrical and thermal performance, as well as

extremely high reliability under highly stressful operating conditions. All

modules are protected from abnormal input/output voltage, current, and

temperature conditions. For lower power needs with the 15V output, bu

in a similar small form factor, please check out Delta S48SP (36W o

15V/2.3A) and S48SE (17W or 15V/1A) series standard DC/DC modules.

FEATURES

 High efficiency: 90.5% @ 15V/4.4A

 Size: 33.0 x 22.9 x 9.5 mm

(1.30”x0.90”x0.37”)

 Industry standard footprint and pinout

 Fixed frequency operation

 SMD and through-hole versions

 Input UVLO and OVP

 OTP and output OCP, OVP

 Output voltage trim: -15%, +10%

 Monotonic startup into normal and

pre-biased loads

 2250V isolation and basic insulation

 No minimum load required

 No negative current during power or

enable on/off

 ISO 9001, TL 9000, ISO 14001, QS 9000,

OHSAS18001 certified manufacturing

facility

 UL/cUL 60950 (US & Canada)

recognized, and TUV (EN60950) certified

 CE mark meets 73/23/EEC and

93/68/EEC directive

OPTIONS

 SMD pins

 Positive remote On/Off

 OTP and output OVP, OCP mode

(auto-restart or latch)

APPLICATIONS

 Optical Transport

 Data Networking

 Communications

 Servers

DATASHEET
DS_V48SR15004_06122007

TECHNICAL SPECIFICATIONS

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

PARAMETER NOTES and CONDITIONS V48SR15004 (Standard)

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous 80 Vdc

Transient (100ms) 100ms 100 Vdc
Operating Temperature Refer to figure 21 for measuring point -40 121 °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 32.5 34 35.5 Vdc

Turn-Off Voltage Threshold 30.5 32 33.5 Vdc

Lockout Hysteresis Voltage 1 2 3 Vdc

Maximum Input Current 100% Load, 36Vin 2.3 A
No-Load Input Current 50 mA
Off Converter Input Current 10 mA
Inrush Current (I2t) 1 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 20 mA
Input Voltage Ripple Rejection 120 Hz 60 dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 14.85 15.00 15.15 Vdc
Output Voltage Regulation

Over Load Io=Io, min to Io, max ±3 ±10 mV

Over Line Vin=36V to 75V ±3 ±10 mV

Over Temperature Tc=-40°C to125°C ±150 mV

Total Output Voltage Range Over sample load, line and temperature 14.55 15.45 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 120 200 mV

RMS Full Load, 1µF ceramic, 10µF tantalum 30 60 mV

Operating Output Current Range 0 4.4 A
Output Over Current Protection Output Voltage 10% Low 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 300 mV

Negative Step Change in Output Current 75% Io.max to 50% Io.max 300 mV

Settling Time (within 1% Vout nominal) 200 us

Turn-On Transient

Start-Up Time, From On/Off Control 30 ms

Start-Up Time, From Input 30 ms

Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 1000 µF

EFFICIENCY

100% Load 90.5 %
60% Load 90.5 %

ISOLATION CHARACT ERISTICS

Input to Output 2250 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1100 pF

FEATURE CHARACTERISTICS

Switching Frequency 380 420 460 kHz
ON/OFF Control, Negative Remote On/Off logic

Logic Low (Module On) Von/off 0.7 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 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 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; % of nominal Vout 115 170 %

GENERAL SPECIFICATIONS

MTBF Io=80% of Io, max; Ta=25°C, airflow rate=300FLM T2.46 M hours Weight 16 grams Over-Temperature Shutdown Refer to figure 21 for measuring point 126 °C

Min. Typ. Max. Units

Pout ≦ max rated power
Pout ≦ max rated power

-15 10 %
10 %

DS_V48SR15004_06122007

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ELECTRICAL CHARACTERISTICS CURVES

Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C

Figure 3: Typical full load input characteristics at room
temperature

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

nominal, and maximum input voltage at 25°C.

DS_V48SR15004_06122007

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ELECTRICAL CHARACTERISTICS CURVES

)

)

For Negative Remote On/Off Logic

Figure 4: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V. Top Trace: Vout, 5.0V/div; Bottom
Trace: ON/OFF input, 2V/div

For Positive Remote On/Off Logic

Figure 6: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V. Top Trace: Vout, 5.0V/div; Bottom
Trace: ON/OFF input, 2V/div

Figure 5: Turn-on transient at zero load current (5 ms/div).

Vin=48V. Top Trace: Vout: 5.0V/div, Bottom Trace: ON/OFF
input, 2V/div

Figure 7: Turn-on transient at zero load current (5 ms/div).

Vin=48V. Top Trace: Vout, 5.0V/div; Bottom Trace: ON/OFF
input, 2V/div

TBD

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 (200mV/div, 200us/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

, Bottom Trace: Iout (2A/div).

Figure 9: Output voltage response to step-change in load

current (75%-50%-75% of Io, max; di/dt = 2.5A/µs). Load cap:

Ω

470µF, 35m
capacitor. Top T race: Vout (50mV/div, 200us/div
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

ESR solid electrolytic capacitor and 1µF ceramic

, Bottom T race:

DS_V48SR15004_06122007

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ELECTRICAL CHARACTERISTICS CURVES

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 above

) 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 (200 mA/div, 1us/div)

Vo(+)

, at full rated output

c

StripCopper

Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div, 1us/div)

10u

1u

SCOPE

RESISTIV

LOAD

Vo(-)

Figure 13: Output voltage noise and ripple measurement test

setup

Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=4.4A)(50 mV/div, 1us/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.

DS_V48SR15004_06122007

Figure 15: Output voltage vs. load current showing typical

current limit curves and converter shutdown points

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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 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. Below is the example of using Delta
latest FL75L07 7A surface mountable input filter tested
with V48SR15004 to meet class B compliance.

Schematic and Components

EMC Test Result

Test result is in compliance with EN55022 class B as
shown below.

Average mode, @ Vin = 48V, Iout=4.4A

Filter = Delta EMI Filter, FL75L07;
L1 = 1uH differential inductor;
CX = 100uF/100V low impedance electrolytic capacitance;
CY1 = 0.22uF low impedance SMT ceramic capacitance.

Suggested Layout

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DESIGN CONSIDERATIONS

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.

DS_V48SR15004_06122007

Soldering and Cleaning Considerations

Post solder cleaning is usually the final board assembl
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/o
drying is especially important for un-encapsulated and/o
open frame type power modules. For assistance on
appropriate soldering and cleaning procedures, please
contact Delta’s technical support team.

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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, and enter hiccup mode or latch
mode, which is optional.

For hiccup mode, the module will try to restart after
shutdown. If the over current condition still exists, the
module will shut down again. This restart trial will continue
until the over-current 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-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, and enter in hiccup
mode or latch mode, which is optional.

For hiccup mode, the module will try to restart after
shutdown. If the over voltage condition still exists, the
module will shut down again. This restart trial will continue
until the over-voltage 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 hiccup mode or latch
mode, which is optional.

For hiccup mode, the module will try to restart after
shutdown. If the over temperature condition still exists,
the module will shut down again. This restart trial will
continue until the over-temperature 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.

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.

DS_V48SR15004_06122007

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(+)

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% × Vout

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.

8

×

×

FEATURES DESCRIPTIONS (CON.)

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.

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 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 to obtain
a percentage output voltage change △% is defined

as:

∆+

511

) (100 Vo11.5

=− KupRtrim 2.10

1.225

∆

−
∆

()

Ω−

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

⎡

=− KdownRtrim 2.10

⎢

∆

⎣

Ex. When Trim-down -10% (15V×0.9=13.5V)

511

⎡
⎢

10

⎣

−

−=− KKdownRtrim 9.402.10

⎤

()

Ω

⎥
⎦

⎤

() ()

⎥
⎦

Ω=Ω

Ex. When Trim-up +10% (15V×1.1=16.5V)

=− KupRtrim 6272.10

Trim resistor can also be connected to Vo+ or Vo- but it
would introduce a small error voltage than the desired
value.

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.

+

×

10225.1

511

)10100(1511.5

10

()

Ω=−−

DS_V48SR15004_06122007

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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’’).

Figure 20: Wind tunnel test setup

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: Temperature measurement location
The allowed maximum hot spot temperature is defined at 121

Output Current (A)

5

4

3

2

1

0

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

V48SR15004(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin = 48V (Either Orientation)

Natural

Convection

100LFM

200LFM

300LF M

400LF M

500LFM

600LFM

Ambient Te mperature (℃)

Figure 22: Output Current vs. Ambient Temperature and Air
Velocity @ Vin=48V (Either Orientation)

℃

.

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PICK AND PLACE LOCATION RECOMMENDED PAD LAYOUT (SMD)

SURFACE-MOUNT TAPE & REEL

DS_V48SR15004_06122007

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℃

LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE

Peak temp.

210~230°C 5sec.

Cooling down rate <3°C /sec.

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.

Over 200°C

Note: The temperature refers to the pin of V48SR, 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 v48SR, measured on the pin +Vout joint.

DS_V48SR15004_06122007

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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_V48SR15004_06122007

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PART NUMBERING SYSTEM

V 48 S R 150 04 N R F A

Type of

Product

V - 1/16

brick

Input

Voltage

48V S - Single R - Regular 150 - 15V 04 - 4A N- Negative

Number of

Outputs

Product

Series

Output

Voltage

Output

Current

ON/OFF

Logic

(Default)

P- Positive

Pin

Length/Type

R - 0.170”

(Default)

N - 0.145”

K - 0.110”

M - SMD

Option Code

F- RoHS 6/6

(Lead Free)

A - Standard Functions

MODEL LIST

MODEL NAME INPUT OUTPUT EFF @ 100% LOAD

V48SR1R225NRFA 36V~75V 1.2A 1.2V 25A 84.0%
V48SR1R525NRFA 36V~75V 1.4A 1.5V 25A 85.0%
V48SR1R825NRFA 36V~75V 1.6A 1.8V 25A 87.0%
V48SR2R520NRFA 36V~75V 1.8A 2.5V 20A 89.0%
V48SR3R320NRFA 36V~75V 2.4A 3.3V 20A 90.5%
V48SR05013NRFA 36V~75V 2.3A 5.0V 13A 91.0%
V48SR12005NRFA 36V~75V 2.3A 12V 5.5A 91.0%
V48SR15004NRFA 36V~75V 2.3A 15V 4.4A 90.5%

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 office.

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.

DS_V48SR15004_06122007

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