Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833

09/13/2013

603-778-2300 www.wallindustries.com Fax 603-778-9797

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CMFA Series

Full Brick

250-300 Watt, Single Output

Chassis Mount DC/DC Converter

Rev E

FEATURES

● 100% Burn In

● Chassis Mount

● Synchronizable

● Output Trim ±10%

● 1500VDC Isolation

● Operation to No Load

● Very Low Output Ripple

● Output Current up to 60A

● Fast Transient Response

● Fixed Switching Frequency

● 250-300 Watts Output Power

● Remote Sense Compensation

● Remote ON/OFF (Active High/Low)

● Short Circuit and Over Temperature Protection

● 90% Efficient at Half Load, 88% Efficient at Full Load

SPECIFICATIONS: CMFA Series

All specifications apply @ 25°C ambient unless othe rwise noted

INPUT SPECIFICATIONS

Input Voltage Range................................................................. 10-36VDC

UVLO Turn On at ................................................................... 10VDC max

UVLO Turn off at ................................................................... 9.5VDC max

Input Surge Voltage (100ms)......................................................... 50VDC

Reflected Ripple Current (nominal Vin and full load).........................20mA

Remote ON/OFF ................................................See Technical Datasheet

Input Current under Remote Off .........................................................1mA

Maximum Input Current (Low Line)......................................................35A

No Load Input Current........................................................................0.1A

OUTPUT SPECIFICATIONS

Output Voltage ............................................................................see table

Voltage Accuracy ...............................................................................±1%

Output Adjustability .......................................................................... ±10%

Output Current ............................................................................see table

Output Power ..............................................................................see table

Line Regulation (LL to HL at FL)...................................................... ±0.2%

Load Regulation (20% to 100% load) .............................................. ±0.2%

Ripple/Noise (20 MHz BW)................................................... 1% Vout max

Temperature Coefficient .................................................±0.02% / °C max.

Transient Response (50% load step)............................. 5% total deviation

PROTECTION SPECIFICATIONS

Current Limit ......................................................................................130%

Short Circuit Protection ......................................Continuous, self re-setting

Over Temperature Protection .....................................110°C, self re-setting

GENERAL SPECIFICATIONS

Efficiency ..................................................................................90% typical

Switching Frequency............................................................... 700KHz typ.

Isolation Voltage (Input to Output)........................................1500VDC min.

Isolation Resistance .....................................................................1G

min.

Isolation Capacitance...................................................................... 0.01µF

ENVIRONMENTAL SPECIFICATIONS

Operating Temperature (ambient) .......................... -40°C ~ +100°C (case)

Storage Temperature .........................................................-55°C ~ +125°C

Humidity.................................................................fully potted construction

Cooling ........................................................ heatsink optional (see Note 4)

MTBF................................................................................ 2,212,456 hours

PHYSICAL SPECIFICATIONS

Weight ............................................................................................... 11 oz

Dimensions of Fixture .......................... 8.00(L) x 3.40(W) x 0.91(H) inches

Dimensions of DC/DC Converter..........................4.6(L) x 2.4(W) x 0.50(H)

Shielding of DC/DC Converter.......................................................six-sided

Due to advances in technology, specifications subject to change without notice

DESCRIPTION

The CMFA series consists of high-density full brick converters

that incorporate the desired features required in today’s

demanding low voltage bus applications. Its unique dual

interleaved phase-shifted topology minimizes both input and

output noise. When performance, reliability, and low cost are

needed, the CMFA series delivers.