PISA11

PISA11-Series

Shutdown behavior to avoid under-voltage situations on the supply voltage

A further limitation of the output current activates when the supplying power source can not deliver enough current

to support all loads without bringing the power source into overload followed by a voltage drop. In such an event, the

voltage dependent current limitation of the input stage of the protection module is activated (safeguard circuit). This

safeguard circuit acts like a valve only permitting so much current so that the supply voltage does not fall below 21V.

The period of time for how long the protection circuit is able to actively limit the current depends on the difference

between input and output voltage and the current which flows through the PISA protection module and is limited to

a maximum of 5s. All four outputs will shutdown simultaneously.

Shutdown times for a short circuit condition across the outputs can be found in Fig. 6-2.

Fig. 6-2 Active current limitation – Period of time in current limiting mode until the outputs will shutdown

Adjustable

Power

Supply

+

-

Load

Short

PISA

Module

Test Setup

10ms

100ms

1s

10s

2A

4A

6A

8A

10A

12A

14A

16A

18A

20A

45°C

Output Current

Shutdown Time, typ.

5s

20°C

Test Procedure:

1.

Set the output current of the adjustable power supply to

the test current value.

2.

Set load current to 80% of the test current and wait for

a thermally stable condition.

3.

Short circuit the output of the PISA module and measure

the time until the outputs shutdown.

No single output channel is allowed to be overloaded

The output current is the sum of all outputs.

May 2014 / Rev. 1.7 DS-PISA11 - data sheet -

All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.

www.pulspower.com Phone +49 89 9278-0

Germany

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