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cPCI420-DC REV B 8/2002

Product: www.cdpowerelectronics.com

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DERATING CHART

SPECIFICATIONS,ALLMODELS

Current Share

Active current sharing is employed on outputs V1, V2, and V3.

Accuracy exceeds 10% of maximum rated load. N

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

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

reason. Unit is protected against reversed or shorted sense

leads.

Output Power

420W continuous maximum, with 400lfm airflow at a

maximum ambient of 50°C. See Derating Chart on page 3 for

additional data.

Overload Protection

Outputs are individually protected against overloads and

indefinite short circuit with automatic recovery upon removal

of the fault condition.

Over Voltage Protection

down and latch off under an OVP fault condition. Restart of

the unit is accomplished by cycling of the input power.

Over Temperature Protection

Thermal switch shuts down the power supply in the event that

critical temperatures are exceeded. Unit will automatically

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.

Synchronous Start

Interconnection of the Sync Start pin (pin 23) ensures that the

outputs of parallel supplies will be enabled simultaneously to

Power derating is load profile-dependent;

data shown reflects output load currents

reduced in direct proportion to the power

derating.

ensure sufficient source current in applications where the load

current exceeds the capacity of a single power supply module.

Remote Inhibit (INH#)

Secondary referenced, active low, TTL compatible signal inhibits

all outputs upon activation.

Power Fail Warning (FAL#)

Secondary referenced, active low, TTL compatible signal

indicates 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

connector.

Temperature Warning (DEG#)

Open collector indicates internal temperatures are

approaching the thermal shutdown limit.

Fault Indicator

Red LED will be ON if output voltages are not within

specification.

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. See Derating Chart below for additional data.

Temperature

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

over the range of 0-50°C. See Derating Chart below for

additional data. 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.