Other Parts Discussed in Thread: UCC27211
Hello,
I seem to be having a similar issue to this post from 2013, however I haven't been able to get a hold of him to ask if his fix worked:
https://e2e.ti.com/support/power-management/f/196/t/273008
I have an LM5017 powered off 44-51V and its output is connected to the primary coil of a transformer to give 3 isolated 14V outputs. This is for a 3-phase motor drive application and the outputs are powering TI UCC27211 high/low side gate drivers.
The motor drive works for for the most part, but every now and then (I don't know how to replicate the failure) the LM5017 will just pop and we will see a hole in the package near the VIN pin or the pin burned off. This only happens on a "start" condition when the gates begin to switch/FETs begin to turn on. The last one was bad enough to actually delaminate the 1oz trace on our PCB!
My gate drive circuit is 3x of these:
Has anyone had a similar failure with this part or is there an applications engineer for this part that can shed some light on what events cause this type of failure? I have had 6 LM5017 chips fail so far in the same manner.
Thanks,
Vishaal Varahamurthy
Electrical Engineer
LaunchPoint Technologies