Delphi DEW1000 Series DC/DC Power
Modules: 24, 48Vin, 2W SIP
The Delphi DEW1000, 24V and 48V 4:1 wide input, single or dual
output, DIP form factor, isolated DC/DC converter is the latest
offering from a world leader in power systems technology and
manufacturing ― Delta Electronics, Inc. The DEW1000 series
operate from 24V or 48V (4:1) and provides 3.3V, 5V, 12V, or 15V of
single output or ±5V, ±12V, or ±15V of dual output in an industrial
standard, plastic case encapsulated SIP package. This series
provides up to 2W of output power with 1500V isolation and a typical
full-load efficiency up to 80%. 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. APPLICATIONS
Industrial
Transportation
Process/ Automation
Telecom
Data Networking
DATASHEET
DS_DEW1000_12032008
FEATURES
Efficiency up to 80%
Industry standard form factor and pinout
Body size:
25.95 x9.25 x12.45mm
(1.02” x0.36” x0.49”)
Input: 5V, 12V, 24V, 48V (2:1)
Output: 3.3, 5, 12, 15, ±5, ±12, ±15V
Output OCP, SCP
Low ripple and noise
1500V isolation
UL 94V-0 Package Material
ISO 9001 and ISO14001 certified
manufacturing facility
OPTIONS
2
TECHNICAL SPECIFICATIONS
TA = 25°C, airflow rate = 0 LFM, nominal Vin, nominal Vout, resistive load unless otherwise noted.
PARAMETER NOTES and CONDITIONS DEW1000 (Standard)
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Transient 24V input model, 1000ms -0.7 50 Vdc
Transient 48V input model, 1000ms -0.7 100 Vdc
Internal Power Dissipation 2500 mW
Operating Temperature Ambient -40 85 °C
Case -40 100 °C
Storage Temperature -55 105 °C
Humidity 95 %
Lead Temperature in Assembly 1.5mm from case for 10 seconds 260 °C
Input/Output Isolation Voltage 1500 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 24V model 9 12, 24 36 Vdc
48V model 18 24, 48 75 Vdc
Turn-On Voltage Threshold 24V model 4.5 6 8.5 Vdc
48V model 8.5 12 17 Vdc
Turn-Off Voltage Threshold 24V model --- --- 8 Vdc
48V model --- --- 16 Vdc
Maximum Input Current Please see Model List table on page 6 Vdc
No-Load Input Current 24V model 20 mA
48V model 15 mA
Input Reflected Ripple Current 24V model 300 mA
48V model 600 mA
Short Circuit Input Power All models 1.5 W
Reverse Polarity Input Current All models 0.5 A
OUTPUT CHARACTERISTICS
Output Voltage Set Point Accuracy ±1.0 ±2.0 %
Output Voltage Balance Dual output models ±1.0 ±2.0 %
Output Voltage Regulation
Over Load Io=25% to 100% ±0.5 ±0.75 %
Over Line Vin= Vin,min to Vin,max ±0.3 ±0.5 %
Over Temperature Tc=-40°C to 71°C ±0.01 ±0.02 %/C
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 0.47µF ceramic 30 50 mV
Peak-to-Peak, over line, load, temperature Full Load, 0.47µF ceramic 75 mV
RMS Full Load, 0.47µF ceramic 15 mV
Output Over Current/Power Protection Auto restart 120 %
Output Short Circuit Continuous
Output Voltage Current Transient
Step Change in Output Current 25% step change ±3 ±5 %
Settling Time (within 1% Vout nominal) 100 300 uS
Maximum Output Capacitance 3.3Vo 2200 µF
5Vo 1000 µF
12Vo 170 µF
15Vo 110 µF
±5Vo, each output 470 µF
±12Vo, each output 100 µF
±15Vo, each output 47 µF
EFFICIENCY
100% Load Please see Model List table on page 6
ISOLATION CHARACT ERISTICS
Isolation Voltage Input to output, 60 Seconds 1500 Vdc
Isolation Voltage Test Flash Test for 1 seconds 1650 Vdc
Isolation Resistance 500VDC 1000 MΩ
Isolation Capacitance 100KHz, 1V 250 500 pF
FEATURE CHARACTERISTICS
Switching Frequency 300 kHz
ON/OFF Control
Logic Low (module is on) Von/off -0.7 0.6 V
Logic High (module is off) Von/off at Ion/off=1.0mA 2.9 15 V
ON/OFF Current Logic High, Von/off=5V 1 mA
Standby Input current 1 3 mA
GENERAL SPECIFICATIONS
MTBF MIL-HDBK-217F; Ta=25°C, Ground Benign 1 M hours
Weight 6.5 grams
Case Material Non-conductive black plastic
Flammability UL94V-0
Input Fuse 24V model, 350mA slow blown type
48V model, 135mA slow blown type
3
ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. Input Voltage (Single Output) Figure 2: Efficiency vs. Input Voltage (Dual Output)
Figure 3: Efficiency vs. Output Load (Single Output)
Figure 4: Efficiency vs. Output Load (Dual Output)
4
Test Configurations
Input Reflected-Ripple Current Test
Setup
+Out
-Out
+Vin
-Vin
DC / DC
Converter Load
Battery
+ Lin+
Cin
To Oscilloscope
Current
Probe
Input reflected-ripple current is measured with a
inductor Lin (4.7uH) and Cin (220uF, ESR < 1.0Ω at
100 KHz) to simulate source impedance. Capacitor
Cin is to offset possible battery impedance. Current
ripple is measured at the input terminals of the
module and measurement bandwidth is 0-500 KHz.
Peak-to-Peak Output Noise Measurement
Scope measurement should be made by using a
BNC socket, measurement bandwidth is 0-20 MHz.
Position the load between 50 mm and 75 mm from
the DC/DC Converter. A Cout of 0.47uF ceramic
capacitor is placed between the terminals shown
below.
+Out
-Out
+Vin
-Vin
Single Output
DC / DC
Converter
Resistive
Load
Scope
Copper Strip
Cout
+Out
-Out
+Vin
-Vin
Dual Output
DC / DC
Converter
Resistive
Load
Scope
Copper Strip
Cout
Com.
Scope
Cout
Design & Feature Considerations
The DEW1000 circuit block diagrams are shown in
Figures 5 and 6.
PFM Isolation Ref.Amp
LC
Filter
+Vin
-Vin
-Vo
+Vo
Figure 5: Block diagram of DEW1000 single output
modules.
+V
o
PFM Isolation Ref.Amp
LC
Filter
+Vin
-Vin
Co
m
-Vo
Figure 6: Block diagram of DEW1000 dual output
modules.
Input Source Impedance
The power module should be connected to a low ac-
impedance input source. Highly inductive source
impedances can affect the stability of the power
module.
+
+Out
-Out
+Vin
-Vin
DC / DC
Converter Load
DC Power
Source
+
-
Cin
In applications where power is supplied over long lines
and output loading is high, it may be necessary to use
a capacitor at the input to ensure startup.
Capacitor mounted close to the input of the power
module helps ensure stability of the unit, it is
recommended to use a good quality low Equivalent
Series Resistance (ESR < 1.0Ω at 100 KHz) capacitor
of a 1.5uF for the 24V and 48V devices.
5
Design & Feature Considerations
Maximum Capacitive Load
The DEW1000 series has limitation of maximum
connected capacitance at the output. The power
module may be operated in current limiting mode
during start-up, affecting the ramp-up and the startup
time. The maximum allowed capacitive load is listed in
table on page 2.
Output Ripple Reduction
A good quality low ESR capacitor placed as close as
practicable across the load will give the best ripple and
noise performance.
To reduce output ripple, it is recommended to use
3.3uF capacitors at the output.
+Out
-Out
+Vin
-Vin
Load
DC Power
Source
+
-
Cout
Single Output
DC / DC
Converter
+Out
-Out
+Vin
-Vin Load
DC Power
Source
+
-
Cout
Com.
Dual Output
DC / DC
Converter
Remote On/Off
The DEW1000 has negative remote on/off logic.
Negative logic remote on/off turns the module on during
a logic low voltage on the remote on/off pin, and off
during a logic high.
Remote on/off can be controlled by an external switch
between the on/off terminal and the -Vin terminal. The
switch can be an open collector or equivalent.
Vo(+)
Vo(-)
Vi(+)
Vi(-)
ON/OFF
Overcurrent Protection
To provide protection in a fault (output overload) condition,
the unit is equipped with internal current limiting circuitry
and can endure current limiting for an unlimited duration.
At the point of current-limit inception, the unit shifts from
voltage control to current control. The unit operates
normally once the output current is brought back into its
specified range.
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.
Notes:
1. These power converters require a minimum output load
to maintain specified regulation (please see page 6 for
the suggested minimum load). Operation under no-load
conditions will not damage these modules; however,
they may not meet all specifications listed above.
2. These DC/DC converters should be externally fused at
the front end for protection.
6
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 facing PWB and
PWB is constantly kept at 25.4mm (1’’).
Figure 7: Wind tunnel test setup
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
DEW1000series Output Current vs. Ambient Temperature and Air Velocity
(Either Orientation)
0%
20%
40%
60%
80%
100%
120%
25 35 45 55 65 75 85
Ambient Temperature (℃)
Output Power (%)
Natural
Convection
Figure 8: Derating Curves
7
MODEL LIST
INPUT OUTPUT Full Load
Efficiency
Vdc (V) Max (mA) Vdc (V) Max (mA) Min (mA) %
DEW1021 97 3.3 500 125 71
DEW1022 110 5 400 100 76
DEW1023 106 12 167 42 79
DEW1024 105 15 134 33 80
DEW1025 114
±5 ±200 ±50 73
DEW1026 108
±12 ±83 ±21 77
DEW1027 106
±15 ±67 ±17 79
DEW1031 49 3.3 500 125 70
DEW1032 58 5 400 100 72
DEW1033 54 12 167 42 78
DEW1034 54 15 134 33 78
DEW1035 60
±5 ±200 ±50 70
DEW1036 55
±12 ±83 ±21 76
DEW1037 55
±15 ±67 ±17 76
24
(9 ~ 36)
48
(18 ~ 75)
MODEL NAME
8
MECHANICAL DRAWING
BOTTOM VIEW
SIDE VIEW
2.03 [0.08] 2.54
[0.10] 7.62 [0.30]
25.95 [1.02]
2.54[0.100]X8=20.32 [0.80]
0.3 [0.01]
0.5 [0.02]
2.75 [0.11]
123 6789
12.45 [0.49]3.2 [0.13]
9.25 [0.36]
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
Asia & the rest of world:
Telephone: +886 3 4526107 ext 6220~6224
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.
Pin Sin
g
le Output Dual Output
1-Vin -Vin
2+Vin +Vin
3 On/off On/off
6 +Vout +Vout
7 NC Common
8 NC NC
9 -Vout -Vout
