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LM5116: Chip blows up

Samuel Pitt
Prodigy 10 points
Part Number: LM5116
Other Parts Discussed in Thread: CSD19534Q5A

Hi

I am using the lm5116 buck converter with the following parameters:

Input: 65...80V

Output: 48...56V/ 5A

Schematics:

Layout:

For some reason the chip just explodes as soon as I power the thing up...

Does anyone see my mistakes?

Regards,

Samuel

  • 0
    TI__Guru 72622 points

    Hi Samuel,

    The 650V CoolMOS for the low-side FET has quite high Miller plateau voltage. No need for a MOSFET voltage rating that high - maybe you can use the CSD19534Q5A NexFET also for the low-side device. Furthermore, it's important to locate the input decoupling capacitors as close as possible to the high- and low-side FETs to reduce parasitic inductance that leads to ringing, overshoot, etc.

    Regards,

    Tim