The LM5088 is violently self destructing occasionally when the board is powering up - usually when under load, powering multiple small 12V DC motors. We have another product in production that uses this same schematic to do the same function but that is a 4 layer board and this new design is a 2 layer board. (Note the Schematic calls out the -1 chip in error. We always use the -2 chip, on the existing product as well as this new prototype design.) The damage is always in the upper left corner of the chip approximately 2mm from the top and left sides. What part of the circuit is in that section of the die? The supply to the circuit is a rectified (half bridge) 24Vac or about 34Vdc. Any help anyone can provide to help me understand why this is happening would be appreciated.
The pins closest to the damage are Vin, EN, and SS. The Vin is a half wave rectified 24Vac to about 34Vdc. It has a 60V MOV and 2 470uF Caps. So I don't see how it can be getting over voltage to cause such damage since the lm5088 is rated to 75V.
