MD Series
Single and Dual Output
Rev. B
20 Watt DC/DC Converter
2:1 Wide Input Voltage Range
FEATURES
APPLICATIONS
● Output Current up to 6A
● Measurement
● High Efficiency up to 89%
● Wireless Network
● 2:1 Wide Input Voltage Range
● Telecom/Datacom
● Industry Control System
● Semiconductor Equipment
● Six-Sided Continuous Shielding
● 20 Watts Maximum Output Power
● Standard 2.0 x 1.0 x 0.4 Inch Package
● Options: Negative Logic Remote ON/OFF
● Compliant to RoHS EU Directive 2002/95/EC
● CE Mark Meets 2006/95/EC, 93/68/EEC, and 89/336 EEC
SPECIFICATIONS: MD Series
All specifications apply @ 25°C ambient unless otherwise noted
INPUT SPECIFICATIONS
GENERAL SPECIFICATIONS
Efficiency ........................................................................................see table
Switching Frequency .................................................................500KHz typ.
Isolation Voltage (Input to Output).........................................1600VDC min.
Isolation Voltage (Input to case)............................................1600VDC min.
Isolation Voltage (Output to Case) ........................................1600VDC min.
Isolation Resistance ...............................................................109 ohms min.
Isolation Capacitance .............................................................. 1000pF max.
Input Voltage Range ............ 12V nominal input.......................... 9-18VDC
24V nominal input........................ 18-36VDC
48V nominal input........................ 36-75VDC
Input Filter.................................................................................... L-C Type
Input Voltage Variation .................... dv/dt................................ 5V/ms max
(Complies with ETS300 132 part 4.4)
Input Surge Voltage (100ms max) ....... 12V input ...........................36VDC
24V input ...........................50VDC
48V input .........................100VDC
ENVIRONMENTAL SPECIFICATIONS
Input Reflected Ripple Current (nominal Vin and full load)...........20mAp-p
Operating Temperature ................................ -40°C ~ +85°C (with derating)
Storage Temperature ..........................................................-55°C ~ +105°C
Maximum Case Temperature............................................................. 100°C
Relative Humidity...................................................................5% to 95% RH
Start Up Time (nominal Vin and constant resistive load)
Power Up................................................................................10ms typ.
Remote ON/OFF ....................................................................10ms typ.
Remote ON/OFF (Note 6)
(Positive Logic)............... DC-DC ON................Open or 3V < Vr < 12V
DC-DC OFF.............Short or 0V < Vr < 1.2V
Thermal Impedance (Note 7)
(Negative Logic) ............. DC-DC ON...............Short or 0V < Vr < 1.2V
DC-DC OFF..............Open or 3V < Vr < 12V
Natural Convection.............................................................12°C / Watt
Natural Convection with Heat-Sink.....................................10°C / Watt
Input Current of Remote Control Pin (nominal Vin) ........-0.5mA ~ +0.5mA
Remote Off Input Current (nominal Vin) ...........................................2.5mA
Thermal Shock ..................................................................... MIL-STD-810F
Vibration ................................10~55Hz, 10G, 30 minutes along X, Y, and Z
MTBF (Note 1)..................................................................1.791 x 106 hours
OUTPUT SPECIFICATIONS
PHYSICAL SPECIFICATIONS
Output Voltage..............................................................................see table
Voltage Accuracy (nominal Vin and full load) ...................................... ±1%
Voltage Adjustability............................................................................. 10%
Output Current ..............................................................................see table
Output Power........................................................................ 20 watts max.
Line Regulation (LL to HL at FL)....................................................... ±0.2%
Load Regulation (no load to full load) ............................................... ±0.5%
Cross Regulation (Dual) (Asymmetrical load 25% / 100% FL) ............ ±5%
Minimum Load ....................................................................................... 0%
Weight ..................................................................................... 27g (0.95 oz)
Dimensions....................... 2.0 x 1.0 x 0.40 inches (50.8 x 25.4 x 10.2 mm)
Case Material ..............................................................Nickel-coated copper
Base Material................................................FR4 PCB (Effective July 2008)
Potting material..................................................................Epoxy (UL94-V0)
Shielding......................................................................................... six-sided
SAFETY & EMC
Approvals and Standards .................. IEC60950-1, UL60950-1, EN60950-1
Ripple/Noise (20 MHz BW)...........................................................see table
(measured with a 0.1uF/50V MLCC)
EMI (Note 8) ...............EN55022 ......................................................Class A
Air ± 8KV
ESD ....................EN61000-4-2……..
…….Perf. Criteria B
Temperature Coefficient ................................................. ±0.02% / °C max.
Transient Response Recovery Time (25% load step) .......................250us
Contact ± 6KV
Radiated Immunity......EN61000-4-3....................... 10V/m Perf. Criteria A
Fast Transient.............EN61000-4-4.........................±2KV Perf. Criteria B
Surge (Note 9)............EN61000-4-5.........................±1KV Perf. Criteria B
Conducted Immunity...EN61000-4-6.................... 10 Vrms Perf. Criteria A
PROTECTION SPECIFICATIONS
Over Voltage Protection........... 1.5, 1.8, 2.5, 3.3V outputs..................3.9V
(zener diode clamp)
5V output ........................................6.2V
12V output .........................................15V
15V output .........................................18V
Over Load Protection (% of full load at nominal input).............. 150% max.
Short Circuit Protection....................................Hiccup, automatic recovery
Due to advances in technology, specifications subject to change without notice
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
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