What are the ways to test a switching IC like TOP266EG with a multimeter?

Ian0

Joined Aug 7, 2020
5,527
If it has failed, the the MOSFET usually failed short circuit. If you find a low resistance between the D and S terminals, then it is dead.
It will probably look like a silicon diode between S and D.
In fact, if you find a low resistance between any two terminals, then it is probably dead.
But you can’t assume that if there is a high resistance between D and S that it’s going to work.
 

Thread Starter

PhysicsSolvesAll

Joined Jun 23, 2022
7
If it has failed, the the MOSFET usually failed short circuit. If you find a low resistance between the D and S terminals, then it is dead.
It will probably look like a silicon diode between S and D.
In fact, if you find a low resistance between any two terminals, then it is probably dead.
But you can’t assume that if there is a high resistance between D and S that it’s going to work.
what do you mean by " But you can’t assume that if there is a high resistance between D and S that it’s going to work. " ??
 
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