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TPS54232-EVM-415 Ic burning when used with external Lipo battery pack

Gaoshang Li
Prodigy 10 points
Other Parts Discussed in Thread: TPS54232

I purchased 5 of this board TPS54232-EVM-415.

I intended to use this DC-DC regulator in my experimental set up.

My set up voltage is set to be at 16.8V and i will like the EVM board to regulate it to 12V and 2A output to support my system.

Testing of the board with a external power supply generator set at 16.8V and 2A input, the TI Dc-Dc board works perfectly.

However, when i changed the power supply to an external lipo battery pack providing 16.8V, 2200mah output, upon connecting the battery to the Vin of the board, a huge spark appeared and the IC chip on the TI board burnt.

May i know what is causing this issue?

I have tested the battery with 3 of my boards and all 3 suffered the same effects of having sparks before the ic chip burnt. All worked perfectly with the power supply however.

May i have some insight of why is this happening?

Thank you!

  • 0
    TI__Guru**** 191445 points

    Most likely there is a voltage  transient when you connect the battery directly to the IC.  When you use an external supply the output voltage ramps up slowly.  You may want to consider a TVS on the input to the TPS54232.