FEATURES
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High efficiency: 90.5% @ 5V/ 12A
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Size: 58.4mm x 22.8mm x 10.0mm
(2.30” x 0.90” x 0.39”)
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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
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Output voltage trim ±10%
No minimum load required
ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS 18001 certified manufacturing
facility
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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 E24SR, 66W Eighth Brick Family
DC/DC Power Modules: 24V in, 5V/12A out
OPTIONS
The Delphi Series E24SR Eighth Brick, 24V input, single output, isolated
DC/DC converters are the latest offering from a world leader in power
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 current
(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 output
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 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.
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Positive On/Off logic
SMD pin
Short pin lengths available
APPLICATIONS
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Telecom / DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial / Test Equipment
DATASHEET
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ELECTRICAL CHARACTERISTICS CURVES
7.0
6.0
5.0
4.0
3.0
2.0
1.0
92
90
18Vin
24Vin
36Vin
88
18Vin
86
24Vin
84
36Vin
82
80
2
4
6
8
10
12
2
4
6
8
10
12
Output Current (A)
Output Current (A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
Figure 2: Power dissipation vs. load current for minimum,
maximum input voltage at 25°C
nominal, and maximum input voltage at 25°C.
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
18
20
22
24
26
28
30
32
34
36
Input Voltage (V)
Figure 3: Typical full load input characteristics at room
temperature
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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
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
For Positive Remote On/Off Logic
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
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
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), 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 = 1A/µs). Load cap:
470µF, 35mΩ ESR solid electrolytic capacitor and 1µF ceramic
capacitor.
Top Trace: Vout (100mV/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.
Figure 11: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (200 mA/div, 2us/div)
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
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ELECTRICAL CHARACTERISTICS CURVES
Copper Strip
Vo(+)
Vo(-)
SCOPE
RESISTIVE
LOAD
10u
1u
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)
Figure 13: Output voltage noise and ripple measurement test
setup
6.0
4.0
2.0
0.0
2
4
6
8
10
12
14
16
Loadt Current (A)
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points
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
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DESIGN CONSIDERATIONS
Input Source Impedance
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The input source must be insulated from the ac
mains by reinforced or double insulation.
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.
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.
Layout and EMC Considerations
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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.
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
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.
compliance design.
Application notes to assist
designers in addressing these issues are pending
release.
Safety Considerations
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
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.
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.
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.
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.
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:
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FEATURES DESCRIPTIONS
Vo(+)
Sense(-)
Trim
Vi(+)
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.
ON/OFF
Vi(-)
Sense(-)
Vo(-)
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.
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:
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.
[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).
Over-Temperature Protection
Vo(+)
Sense(-)
Trim
Vi(+)
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.
R
ON/OFF
Vi(-)
Load
Sense(-)
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.
Vo(-)
Distribution
resistance
Figure 17: Effective circuit configuration for remote sense
operation
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.
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.
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.
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.
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.
Care should be taken to ensure that the maximum
output power does not exceed the maximum rated
power.
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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 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:
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:
5.11Vo (100 + Δ ) 511
Rtrim − up =
−
− 10.2(KΩ
)
1.225 Δ
Δ
511
⎡
⎤
Rtrim − down =
− 10.2 (KΩ)
Ex. When Trim-up +10% (5V×1.1=5.5V)
⎢
⎣
⎥
⎦
Δ
Ex. When Trim-down -10% (5V×0.9=0.45V)
5.11×5×(100 +10) 511
Rtrim − up =
−
−10.2 = 168.13
(
KΩ
)
1.225×10
10
511
10
⎡
⎤
Rtrim − down =
− 10.2 (KΩ) = 40.9(KΩ)
⎢
⎣
⎥
⎦
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.
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THERMAL CONSIDERATIONS
Thermal Derating
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.
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.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
THERMAL CURVES
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 21: Hot spot temperature measured point
The allowed maximum hot spot temperature is defined at 118℃
E24SR05012(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@Vin = 24V (Transverse Orientation)
12
Natural
Convection
10
PWB
MODULE
FACING PWB
100LFM
8
200LFM
6
4
2
0
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
AIR FLOW
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 22: Output current vs. ambient temperature and air velocity
@Vin=24V (Transverse Orientation)
12.7 (0.5”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 20: Wind tunnel test setup
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PICK AND PLACE LOCATION
SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)
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LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Peak temp.
2nd Ramp-up temp.
210~230°C 5sec.
1.0~3.0°C /sec.
250
Pre-heat temp.
140~180°C 60~120 sec.
200
Cooling down rate <3°C /sec.
Ramp-up temp.
0.5~3.0°C /sec.
150
100
50
Over 200°C
40~50sec.
0
60
120
Time ( sec. )
180
240
300
Note: The temperature refers to the pin of E24SR, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
.
Temp
Peak Temp. 240 ~ 245 ℃
217℃
200℃
Ramp down
max. 4℃/sec.
Preheat time
100~140 sec.
150℃
25℃
Time Limited 90 sec.
above 217℃
Ramp up
max. 3℃/sec.
Time
Note: The temperature refers to the pin of E24SR, measured on the pin +Vout joint.
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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
Negative input voltage
Remote ON/OFF
Positive input voltage
Positive output voltage
Positive remote sense
Output voltage trim
Negative remote sense
Negative output voltage
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PART NUMBERING SYSTEM
E
24
S
R
050
12
N
R
F
A
Type of
Product Voltage
Input
Number of Product
Output
Voltage
Output
Current
ON/OFF
Logic
Pin
Length/Type
Option Code
Outputs
Series
E - Eighth
Brick
24V
S - Single
R - Regular
050 - 5.0V
12 - 12A
N - Negative
(Default)
R - 0.170”
(Default)
N - 0.145”
K - 0.110”
M - SMD
A - Standard
Functions
F- RoHS 6/6
(Lead Free)
P - Positive
MODEL LIST
MODEL NAME
E24SR3R320NRFA
E24SR05012NRFA
E24SR06508NRFA
E24SR12005NRFA
INPUT
OUTPUT
EFF @ 100% LOAD
18V~36V
18V~36V
18V~36V
18V~36V
5.0A
4.2A
3.4A
4A
3.3V
20A
12A
8A
90%
5.0V
6.5V
12V
90.5%
90.5%
90.5%
5A
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.
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: [email protected]
Asia & the rest of world:
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: [email protected]
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
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at any time, without notice.
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