Datasheet E24SR3R320NRFA,E24SR05012NRFA,E24SR06508NRFA,E24SR12005NRFA Datasheet (Delta Electronics)

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Delphi Series E24SR, 66W Eighth Brick Family

FEATURES

 High efficiency: 90.5% @ 5V/ 12A

 Size: 58.4mm x 22.8mm x 10.0mm

(2.30” x 0.90” x 0.39”)

 SMD and Through-hole versions

 Industry standard pin out

 2:1 input range

 Fixed frequency operation

 Input UVLO, Output OTP, OCP, OVP

 Basic insulation

 2250V isolation

 Monotonic startup into normal and

pre-biased loads

 Output voltage trim ±10%

 No minimum load required

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

OHSAS 18001 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

DC/DC Power Modules: 24V in, 5V/12A out

The Delphi Series E24SR Eighth Brick, 24V input, single output, isolated

DC/DC converters are the latest offering from a world leader in powe

systems technology and manufacturing ― Delta Electronics, Inc. This

product family is available in either a through-hole or surface-mounted

package and provides up to 66 watts of power or 20A of output curren

(3.3V and below) in an industry standard footprint and pinout. The

E24SR converter operates from an input voltage of 18V to 36V and is

available in output voltages from 3.3V to 12V. Efficiency for the 5V outpu

is 90.5% at 12A full load. With creative design technology and

optimization of component placement, these converters possess

outstanding electrical and thermal performance, as well as extremel

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 safet
requirements with basic insulation.

OPTIONS

 Positive On/Off logic
 SMD pin
 Short pin lengths available

APPLICATIONS

 Telecom / DataCom

 Wireless Networks

 Optical Network Equipment

 Server and Data Storage

 Industrial / Test Equipment

DATASHEET
DS_E24SR05012_01032008

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TECHNICAL SPECIFICATIONS

(TA=25°C, airflow rate=300 LFM, Vin=24Vdc, nominal Vout unless otherwise noted.)

PARAMETER NOTES and CONDITIONS E24SR05012 (Standard)

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous 36 Vdc

Transient (100ms) 100ms 50 Vdc
Operating Temperature Refer to figure 21 for measuring point -40 118 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc

INPUT CHARACTERISTICS

Operating Input Voltage 18 36 Vdc
Input Under-Voltage Lockout

Turn-On Voltage Threshold 16 17 17.8 Vdc

Turn-Off Voltage Threshold 15 16 17 Vdc

Lockout Hysteresis Voltage 0.7 1 1.5 Vdc

Maximum Input Current 100% Load, 18Vin 3.9 A
No-Load Input Current 80 150 mA
Off Converter Input Current 3 10 mA
Inrush Current (I2t) 0.1 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 15 mA
Input Voltage Ripple Rejection 120 Hz 55 dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point Vin=24V, Io=Io.max, Tc=25°C 4.925 5.075 Vdc
Output Voltage Regulation

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

Over Line Vin=18V to36V ±3 ±10 mV

Over Temperature Tc=-40°C to100°C ±50 mV

Total Output Voltage Range Over sample load, line and temperature 4.875 5 5.125 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 50 100 mV

RMS Full Load, 1µF ceramic, 10µF tantalum 15 30 mV

Operating Output Current Range 0 12 A
Output Over Current Protection Output Voltage 10% Low 110 140 %

DYNAMIC CHARACTERISTICS

Output Voltage Current Transient 10µF Tan & 1µF Ceramic load cap, 0.1A/µs

Positive Step Change in Output Current 50% Io.max to 75% Io.max 150 250 mV

Negative Step Change in Output Current 75% Io.max to 50% Io.max 150 250 mV

Settling Time (within 1% Vout nominal) 150 us

Turn-On Transient

Start-Up Time, From On/Off Control 5 ms

Start-Up Time, From Input 5 ms

Back bias start-up

Back drive current limit while pin on-off is enabled Io=0

Back drive current limit while pin on-off is disabled Io=0

Maximum Output Capacitance Full load; CR mode;5% overshoot of Vout at startup 5000 µF

EFFICIENCY

100% Load 90.5 %
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) -0.7 0.5 V

Logic High (Module Off) 3 18 V

ON/OFF Control, Positive Remote On/Off logic

Logic Low (Module Off) -0.7 0.5 V

Logic High (Module On) 3 18 V

On/off pin open circuit voltage 9.6 V

On/off pin pull down resistance 12 Kohm
Output Voltage Trim Range
Output Voltage Remote Sense Range
Output Over-Voltage Protection Over full temp range; 5.75 7 V

GENERAL SPECIFICATIONS

MTBF Io=80% of Io, max; Ta=25°C, 300LFM airflow 3.86 M hours
Weight 22.0 grams
Over-Temperature Shutdown Refer to figure 21 for measuring point 123 °C

Min. Typ. Max. Units

≤ 90% of nominal output voltage

Pout ≦ max rated power
Pout ≦ max rated power

0.1
50 m

-10 +10 %
+10 %

DS_E24SR05012_01032008

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ELECTRICAL CHARACTERISTICS CURVES

92

90

88

86

Efficiency (%)

84

82

80

24681012

24Vin

36Vin

Output Current (A )

18Vin

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

maximum input voltage at 25°C

4.0

3.5

3.0

2.5

2.0

1.5

Input Curr ent(A)

1.0

0.5

0.0
18 20 22 24 26 28 30 32 34 36

Input Voltage (V)

7.0

6.0

5.0

4.0

Loss (W)

3.0

2.0

1.0

36Vin

246810

18Vin

24Vin

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Output Current ( A)

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_E24SR05012_01032008

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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) (2 ms/div). Vin=24V. Top Trace: Vout, 2.0V/div; Bottom
Trace: ON/OFF input, 10V/div

For Positive Remote On/Off Logic

Figure 5: Turn-on transient at zero load current (2 ms/div).

Vin=24V. Top Trace: Vout: 2.0V/div, Bottom Trace: ON/OFF

input, 10V/div

Figure 6: Turn-on transient at full rated load current (resistive
load) (2 ms/div). Vin=24V. Top Trace: Vout, 2.0V/div; Bottom

Trace: ON/OFF input, 10V/div

DS_E24SR05012_01032008

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

Vin=24V Top Trace: Vout, 2.0V/div; Bottom Trace: ON/OFF
input, 10V/div

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ELECTRICAL CHARACTERISTICS CURVES

0

)

A

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 (100mV/div, 200us/div

/div). Scope measurement should be made using a BNC

(5
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

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

current (75%-50%-75% of Io, max; di/dt = 1
470µF, 35m
capacitor.
Top Trace: Vout (100mV/div, 200us/div
(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

Ω

ESR solid electrolytic capacitor and 1µF ceramic

/µs). Load cap:

, Bottom Trace: Iout

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

DS_E24SR05012_01032008

Figure 11: Input Terminal Ripple Current, i

current and nominal input voltage with 12µH source impedance

and 33µF electrolytic capacitor (200 mA/div, 2us/div)

, at full rated output

c

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ELECTRICAL CHARACTERISTICS CURVES

E

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

StripCopper

Vo(+)

SCOPE RESISTIV

10u

Vo(-)

1u

LOAD

Figure 13: Output voltage noise and ripple measurement test

setup

Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=12A)(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

6.0

4.0

2.0

Output Voltage(V)

0.0
24681012141

Loadt Current (A)

Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points

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DS_E24SR05012_01032008

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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. 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 inpu

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 15A 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.

s are ELV.

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_E24SR05012_01032008

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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.

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 floating.

Vo(+)

Vi(+)

Vi(+)

ON/OFF

ON/OFF

Vi(-)

Vi(-)

Vo(+)

Sense(-)

Sense(-)

Trim

Trim

Sense(-)

Sense(-)

Vo(-)

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).

Vo(+)

Vi(+)

Vi(+)

ON/OFF

ON/OFF

Vi(-)

Vi(-)

Vo(+)

Sense(-)

Sense(-)

Trim

Trim

Sense(-)

Sense(-)

Vo(-)

Vo(-)

Distribution

Distribution
resistance

resistance

R

R

Load

Load

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_E24SR05012_01032008

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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 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

⎢

Δ

⎣

Ex. When Trim-down -10% (5V×0.9=0.45V)

511

⎡
⎢

10

⎣

−

−=− KKdownRtrim 9.402.10

⎤

()

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 to obtain
a percentage output voltage change △% is defined

as:

Δ+

511

=− KupRtrim 2.10

Ex. When Trim-up +10% (5V×1.1=5.5V)

=− KupRtrim 13.1682.10

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.

1.225

10225.1

) (100 Vo11.5

−

Δ

)10100(511.5

Δ

511

10

()

Ω−

()

Ω=−−

DS_E24SR05012_01032008

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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’’).

FACING PWB

PWB

MODULE

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 118

Output Current(A)

12

10

8

6

E24SR05012(Standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin = 24V (Transverse Orientation)

Convection

Natural

100LFM

200LFM

AIR VELOCIT
AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

IR FLOW

Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)

50.8 (2.0”)

12.7 (0.5”)

Figure 20: Wind tunnel test setup

DS_E24SR05012_01032008

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2

0

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

Ambient Tempera ture (℃)

Figure 22: Output current vs. ambient temperature and air velocity

=24V (Transverse Orientation)

@V

in

10

PICK AND PLACE LOCATION SURFACE-MOUNT TAPE & REEL

RECOMMENDED PAD LAYOUT (SMD)

DS_E24SR05012_01032008

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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 E24SR, 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.

25℃

Note: The temperature refers to the pin of E24SR, measured on the pin +Vout joint.

Preheat time

100~140 sec.

Time Limited 90 sec.
above 217

℃

Time

DS_E24SR05012_01032008

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MECHANICAL DRAWING

Surface-mount module Through-hole module

Pin No. Name Function

1 -Vin
2
3
4
5
6
7
8

ON/OFF
+Vin
+Vout
+SENSE
TRIM

-SENSE

-Vout

Negative input voltage
Remote ON/OFF
Positive input voltage
Positive output voltage
Positive remote sense
Output voltage trim
Negative remote sense
Negative output voltage

DS_E24SR05012_01032008

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PART NUMBERING SYSTEM

E 24 S R 050 12 N R F A

Type of

Product

E - Eighth

Brick

Input

Voltage

24V S - Single R - Regular 050 - 5.0V 12 - 12A 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

F- RoHS 6/6
(Lead Free)

Option Code

MODEL LIST

MODEL NAME INPUT OUTPUT EFF @ 100% LOAD

E24SR3R320NRFA 18V~36V 5.0A 3.3V 20A 90%
E24SR05012NRFA 18V~36V 4.2A 5.0V 12A 90.5%
E24SR06508NRFA 18V~36V 3.4A 6.5V 8A 90.5%
E24SR12005NRFA

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.

18V~36V

4A 12V 5A 90.5%

A - Standard

Functions

CONTACT: www.delta.com.tw/dcdc

USA:

Telephone:
East Coast: [phone]
West Coast: [phone]
Fax: [phone]

[e-mail]

Email:

Europe:

Phone: [phone]
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

DS_E24SR05012_01032008

Asia & the rest of world:

Telephone: [phone] ext 6220
Fax: [phone]
Email:

[e-mail]

14

at any time, without notice.

DS_E24SR05012_01032008

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