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Switching power supplies disconnecting needs a load?

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When disconnecting a switching power supply from the main circuit board to isolate and troubleshoot the switching power supply circuit board. All switching power supplies needs a load even when disconnected from the main circuit board. How do you find out what load value to use to test and troubleshoot a switching power supply?
 

PRJI

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Hi,

Some of the regulators require minimum load for operating in regulator mode. You can get this value from regulator Datasheet.

Thanks
Prajith
 

chuckey

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All mains powered equipment come with a label giving voltage and power taken. So load the power supply to a !/2 of its rated mains input power. This will allow you to test it at a reasonable load. It will not check its over current trip.
Frank
 

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