UCC25660: Lo pin short With Gnd

Hello,

I am reviewing your inquiry and will get back to you shortly.

Regards,

Hello,

Is Lo really shorted to ground?

Did any other components fail on the board as well?

Regards,

Lo pin really short to ground and all other components are safe

Hello,

I have received your inquiry and will get back to you shortly.

Regards,

Hello,

Generally when a pin fails short to ground the device was failed due to electrical overstress.  It will be either excessive current and/or voltage.

You had mentioned the LO pin is the only pin that is shorted to ground and the rest of the components are fine.  Could you double check this by disconnecting the LO connections to any components driving it?

Regards,

I check many times sir only Lo pin short with Gnd others pins behaviour Normal

Hello,

I just wanted to make sure the FET was not pulling the pin to ground.  It is very unusual that just a DRV pin fails.

Is the device out of circuit when you test it?

Do you have a schematic that I could review?

Regards,

UCC25660 SCHEMATIC Please find schematic file in the link 

https://heyzine.com/flip-book/d91b956c09.html

Yes device is out of circuit when I check

Hello,

I received your inquiry and will get back to you shortly.

Regards,

Hello,

I reviewed the schematic and was curious where the + 15 V comes from that powers the UCC25660?

Also you had mentioned that the LO pin is the only one shorted to ground.  That does not mean that the other pins were not damaged.

There is an ESD diode on all of the pins that you can use to check to see if they were damaged.  You can do a diode check from ground to all the pins to see if the diode or the connection to the device insides was damaged.  You just need a meter with a diode check.  You can compare a good device vs a bad device.  A pin being open will be a sign of the pin being damaged.

Regards,