DATASHEET
DS_E24SR12005_12132010
FEATURES
High efficiency: 90.5% @ 12V/ 5A
Size: 58.4mmx22.8mmx10.0mm
(2.30”x0.90”x0.39”)
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
APPLICAT IONS
Telecom / DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial / Test Equipment
OPTIONS
Positive On/Off logic
SMD pin
Short pin lengths available
Delphi Series E24SR, 66W Eighth Brick Family
DC/DC Power Modules: 24V in, 12V/5A out
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 12V
output is 90.5% at 5A 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.
DS_E24SR12005_ 12132010
2
TECHNICAL SPECIFICAT IONS
(TA=25°C, airflow rate=300 LFM, Vin=24 Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS E24SR12005 (Standard)
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 36 Vdc
Transient (100ms) 100ms 50 Vdc
Operating Temperature Refer to figure 21 for measuring point 117 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INP UT C HARAC TE RI ST I C S
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 3.8 A
No-Load Input Current 150 180 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 10 mA
Input Voltage Ripple Rejection 120 Hz 55 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=24V, Io=Io.max, Tc=25°C 11.82 12 12.18 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 ±100 mV
Total Output Voltage Range Over sample load, line and temperature 11.76 12.24 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 5 A
Output Over Current Protection Output Voltage 10% Low 110 140 %
DYNAMIC CHARACTE RISTIC S
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 180 250 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 180 250 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 ≤ 90% of nominal output voltage
Back drive current limit while pin on-off is enabled Io=0A 0.1 A
Back drive current limit while pin on-off is disabled Io=0A 50 mA
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 2000 µF
EFFICIENCY
100% Load 90.5 %
60% Load 90 %
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 Pout ≦ max rated power -10 +10 %
Output Voltage Remote Sense Range Pout ≦ max rated power +10 %
Output Over-Voltage Protection Over full temp range; 13.8 16.8 V
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C, 300LFM airflow 2.81 M hours
Weight 22.0 grams
Over-Temperature Shutdown Refer to figure 21 for measuring point 130 °C
DS_E24SR12005_ 12132010
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ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficien cy vs. load c u rrent 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.
Figure 3: Typical full load input characteristics at room
temperature
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
18 20 22 24 26 28 30 32 34 36
INPUT VOLTAGE (V)
Inputt Current(A)
DS_E24SR12005_ 12132010
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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, 5.0V/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: 5.0V/div, Bottom Trace: ON/OFF
input, 10V/div
For Positi ve Remot e On/ O ff Logi c
Figure 6: Turn-on transient at full rated load current (resistive
load) (2 ms/div). Vin=24V. Top Trace: Vout, 5.0V/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, 5.0V/div; Bottom Trace: ON/OFF
input, 10V/div
0
0
0
0
0
0
0 0
DS_E24SR12005_ 12132010
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ELECTRICAL CHARACTERISTICS CURVES
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 capacito r a nd 1µF ceramic ca pacitor.
Top Trace: Vout (100mV/div, 200us/div), Bottom Trace: Iout
(2
A
/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 = 1
A
/µs). Load cap:
470µF, 35m
Ω
ESR solid electrolytic capacitor and 1µF ceramic
capacitor.
Top Trace: Vout (100mV/div, 200us/div), Bottom Trace: Iout
(2A/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 abov e
Figur e 11: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source i mpedance
and 33µF electrolytic capacitor (200 mA/div, 2us/div)
0
0 0
0
0
DS_E24SR12005_ 12132010
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ELECTRICAL CHARACTERISTICS CURVES
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
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
012345678
Load Current (A)
Output Voltage (V)
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=5A )( 20 mV /di v, 2us/div)
Load capacitance: 1µF ceramic capacitor and 10µF tantalum
capa ci tor. Bandw i d t h: 20 MHz. Scope measu remen t s sho uld 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 m odule
Figure 15: Output voltage vs. load current showing typical
curre nt limit curves and converter shutdown points
0
StripCopper
Vo(-)
Vo(+)
10u 1u SCOPE RESISTIV
LOAD
0
DS_E24SR12005_ 12132010
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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 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.
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,
p
lease contact Delta’s technical su
pp
ort team.
DESIGN CONSIDER AT IONS
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 reference design
for an input filter tested with E24SR12005XXXX to meet
class B in CISSPR 22.
Schematic and Components Lis t
Cin is 100uF*2 low ESR Aluminum cap;
CX is 2.2uF ceramic cap;
CY1 are 10nF ceramic caps;
CY2 are 10nF ceramic caps;
CY is 1nF ceramic cap;
L1 is common-mode inductor, L1=0.53mH;
Test Result: Vin=24V, Io=5A,
Yellow line is quasi peak mode; Blue line is average mode
DS_E24SR12005_ 12132010
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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.
Vi(-)
ON/OFF
Vi(+)
Vo(-)
Trim
Vo(+)
Sense(-)
Sense(-)
Vi(-)
ON/OFF
Vi(+)
Vo(-)
Trim
Vo(+)
Sense(-)
Sense(-)
Fi gu re 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(-)
ON/OFF
Vi(+)
Vo(-)
Trim
Vo(+)
RLoad
Sense(-)
Sense(-)
Distribution
resistance
Vi(-)
ON/OFF
Vi(+)
Vo(-)
Trim
Vo(+)
RLoad
Sense(-)
Sense(-)
Distribution
resistance
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_E24SR12005_ 12132010
9
FEATURES DESCRIPTIONS (CON.)
Output Volt age Adjust me nt (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:
()
Ω
−
∆
=− KdownRtrim 2.10
511
Ex. When Trim-down -10% (12V×0.9=10.8V)
() ()
Ω=Ω
−=− KKdownRtrim 9.402.10
10
511
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:
()
Ω−
∆
−
∆
∆+
=− KupRtrim 2.10
511
1.225 ) (100 Vo11.5
Ex. When Trim-up +10% (12V×1.1=13.2V)
()
Ω=−−
×
+
×
×
=− KupRtrim 3.4892.10
10
511
10225.1 )10100(1211.5
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.
DS_E24SR12005_ 12132010
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THERM AL 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 S etup
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’’).
Note: Win d Tunn el Tes t Se tup Figure D ime ns ions are in millimeters and (Inches )
12.7 (0.5”)
MODULE
A
IR FLOW
50.8
(
2.0”
)
FACING PWB PWB
A
IR VELOCIT
Y
A
ND AMBIEN
T
TEMPERATURE
MEASURED BELOW
THE MODULE
Figure 20: Wind tunnel test setup figure
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 tempera tur e measure d point
The allowed maximum hot spot temperature is defined at 117
℃
E24SR12005(Standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 24V (Transverse Orientation)
0
1
2
3
4
5
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (℃)
Output Current(A)
Natural
Convection
100LFM
200LFM
Figure 2 2: Ou tput cur rent vs. am bient tem perat ure and air v eloci ty
@Vin=24V (Transverse Orientation)
DS_E24SR12005_ 12132010
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PICK AND PLACE LOCATION SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)
DS_E24SR12005_ 12132010
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LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Time ( sec. )
Pre-heat temp.
140~180°C 60~120 sec.
Peak temp.
210~230°C 5sec.
Ramp-up temp.
0.5~3.0°C /sec.
Temperature (°C )
50
100
150
200
250
300 60 0 120 180 240
2nd Ramp-up temp.
1.0~3.0°C /sec.
Over 200°C
40~50sec.
Coolin g down rate <3°C /sec.
Note: The temperature refers to the p in of E24SR, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
Temp.
Time
150℃
200℃
100~140 sec. Time Limited 90 sec.
above 217℃
217℃
Preheat time
Ramp up
max. 3℃/sec.
Ramp down
max. 4℃/sec.
Peak Tem
p
. 240 ~ 245
℃
25℃
Note: The temperature refers to the p in of E24SR, measured on the pin +Vout joi nt.
DS_E24SR12005_ 12132010
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M ECHANICAL DRAWING
Surface-mount module Through-hole module
Pin N o. 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
DS_E24SR12005_ 12132010
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PART NUMBERING SYSTEM
E 24 S R 120 05 N R F A
Type of
Product Input
Voltage Number of
Outputs Product
Series Output
Voltage Output
Current ON/OFF
Logic Pin
Length/Type Option Code
E - Eighth
Brick
24-18V~36V S - Single R - Regular 120 - 12V 05 - 05A N - Negative
P - Positive
R - 0.170”
N - 0.145”
K - 0.110”
M - SMD
F- RoHS 6/6
(Lead Free)
A - Standard
Functions
MODEL L IST
MODEL NAME INP UT OUTPUT EFF @ 100 % LOAD
E24SR06508NRFA 18V~36V 3.4A 6.5V 8A 90.5%
E24SR12005NRFA 18V~36V 4A 12V 5A 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: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: DCDC@delta-corp.com
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: DCDC@delta-es.com
A sia & the rest of world:
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
Email: DCDC@delta.com.tw
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.
