Switching power supplies disconnecting needs a load?

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RickyRockenson

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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?
 

Hi,

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

Thanks
Prajith
 

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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