Parallel opera�on & current share

CPCI AC Rev. 00

Page 3 of 9

www.powersystemtechnology.com

Redundant Systems Opera�on

Hold-up �me

The converters provide internal hold-up �me (see curve).

Hot Swap

The unit incorporates ac�ve limita�on by MOFSET with very low value

of inrush current allowing hot swap opera�on. See curve.

Output Current Limita�on

All outputs are con�nously protected against short-circuit by a constant

current limita�on (no foldback) with automa�c recovery. See Page 2 for

the value.

Thermal Considera�ons

When a converter is mounted in free air, convec�on cooling and is ope-

ra�ng at its nominal output power at the max. ambiant temperature,

the temperature measured on the heatsink should not exeed 95°C. The

dera�ng curves show the max power available from the converter ver-

sus ambiant temperature.

Thermal protec�on & degrade signal

A temperature protec�on (OTP) is integrated in the unit, disabling

output when heatsink temperature exceeds 90°C (+/-5°C). The con-

verter automa�cally restarts, when the temperature drops below 55°C

(+/-5°C). Nevertheless, exceeding the max opera�ng temperature may

cause failures of the converter.

A degraded signal (DEG), open collector, is provided when temperature

exceed 80°C +/-5°C(ac�ve low) and is reset below 70°C +/-5°C. This can

be monitored external system to reduce power and avoid thermal pro-

tec�on. DEG is opened when temperature is within opera�ng range.

Parrallel opera�ng is possible for V1, V2 with ac�ve current sharing.

The signals SHARE are single wire. All V1 SHARE of the different psu in

parrallel will have to be connected together. (Same for V2 SHARE).

When systems require a very high level of reliability and should work

normally in the event of a failure, N+1 redundancy is implemented

where N is the number of converter to support power requirement.

If one converter fail, the remaining ones s�ll delivers the power to the

loads.

Redundant opera�on is directly provided without need of external

diodes and is made internally by an ac�ve MOFSET circuit.(reduc�on

of losses).

Overvoltage protec�on

An OVP is incorporated on each output. All outputs are cut if an OVP

is detected. This protec�on is latch style (Recovery a�er AC reset or

inhibit).

Hold up �me

Inrush current Ac�ve Limita�on

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Output power ambiant 2ms + 4ms

Output

OVP value

+5V

5,66V

+3V3

3,80V

+12V

13,6V

-12V

-13,6V