cPCI 350DC 9/2001 REV C

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Remote Inhibit (INH#)

Secondary referenced, active low, TTL compatible signal in-

hibits all outputs upon activation.

Power Fail Warning (FAL#)

Secondary referenced, active low, TTL compatible signal in-

dicates output failure.

Enable (EN#)

Short pin on connector will enable power supply output when

the mating pin is grounded. Supply will not power up until

this pin is engaged to its mate in the backplane. Unit output

will be inhibited as pin is disengaged from the mating con-

nector.

Temperature Warning (DEG#)

Open collector indicates internal temperatures are approach-

ing the thermal shutdown limit.

Fault Indicator

Red LED will be ON if output voltages are not within specifi-

cation.

Power Present LED

Green LED will be ON when input voltage is present and

above the minimum requirement.

Cooling

400 lfm of airflow required to maintain full output power at 0-

50°C ambient. At 200 lfm, the output power is derated to

175W.

Temperature

0-70°C operating range with full output power achievable over

the range of 0-50°C. Between 50°C and 70°C, output power

derates linearly from 350W to 175W. Storage temperature

limits are –20 to +85°C.

Altitude

Operating: -200 to +10,000 feet with ambient temperature

derating above 5,000 feet in accordance with the adiabatic

lapse rate.

INPUT CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Operating Voltage

36

75

Input Voltage With Stand

34

75

Inrush Current

18

36

Current Share

Active current sharing is employed on outputs V1, V2, and

V3. Accuracy exceeds 10% of maximum rated load. N

4. Output V4 to share within 40% of maximum rated load by

means of droop response.

Remote Sense

Outputs V1, V2, and V3 capable of compensating up to

0.5VDC of line drop. Unit automatically reverts to local sens-

ing in the event that the sense leads are opened for any

reason. Unit is protected against reversed or shorted sense

leads.

Output Power

350W continuous maximum, with 400lfm airflow at a maxi-

mum ambient of 50°C. Output power derates linearly to 175W

at 70°C ambient or 200lfm of airflow at 50°C.

Overload Protection

Outputs are individually protected against overloads and in-

definite short circuit with automatic recovery upon removal

of the fault condition.

Over Voltage Protection

off under an OVP fault condition. Restart of the unit is ac-

complished by cycling of the input power.

OverTemperature Protection

Thermal switch shuts down the power supply in the event

that critical temperatures are exceeded. Unit will automati-

cally restart when acceptable temperatures are restored.

Output Fault Isolation

Output isolation diodes are present in all outputs to isolate

faults within a failed power supply.