How to verity if an LDMOS or High power MOSFET is Defective using a Digital Multimeter-part 2

How to verity if an LDMOS or High power MOSFET is Defective using a Digital Multimeter-part 2

LDMOS are Efficient but Complex Devices, we try to explain with this video an easy way to verify if they are good or broken. Typically the LDMOS, very robust from the part of the Drain have problems on the Gate, and, a fast way to know is reassuring the resistance between drain and source is high, very high. On the other side, when the LDMOS is broken this value change really significantly. Because they are paired inside, it's always possible to compare both sides of the LDMOS. Many times, one of them is broken while the other half is good. The best way is unmount the LDMOS, but good results can be achieved measuring it with the complete RF Amplifier. Here the values are highly affected by the components on the circuit but, if one half of the LDMOS is really in short circuit it's easy to find the difference with the half good one. MOSFETs are outstanding devices when it comes to amplifying or switching of various kinds of loads. Though transistors are also largely applied for the above purposes, both the counterparts are hugely different with their characteristics. Even the simplest of operations like testing a good LDMOS from a bad one is never an easy task especially for the beginners in the field. With this method we test hundreds of LDMOS with always good result.

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