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TPS54335A: Please help me why TPS54335A is burned.

Part Number: TPS54335A

My customer uses TPS54335A as their DC- DC source for their LCD product.

Vin is between 8V- 28V, the designed Vout is 5V, 3A. In fact, their output current is just 800mA. When the power is on, 10 of their 2000 board is burned, which happened at the TPS54335A part. 

The main difference between their design and the Webench design is their switch frequency is 1.4MHz.

Their schematic diagram is as follows.

And their PCB diagram is as follows. The PCB is a four layer  board.

Can you give me some advice for this TPS54335A burned case?  What else material should I offer? If have any, please tell me.

Thanks!

  • hi,

    I am looking into this question, and give you feedback on Monday.

    Jason Wang

    APP/BSR/MCP (Monolithic Converter Products)

  • In reply to Jason Wang (MCP):

    Hi,
    Except the schematic and layout, we need some waveforms to analysis. Please send email to Milo Zhu for the deep analysis and support.
    email address: peisheng-zhu@ti.com

    Jason Wang

    APP/BSR/MCP (Monolithic Converter Products)

  • In reply to Jason Wang (MCP):

    PH waveform when Vout is 3.3V.

    PH waveform when Vout is 5V.

    PH waveform when Vout is 8.8V.

  • In reply to user5813940:

    Because the question is discussed via email, so close this ttread.

    Jason Wang

    APP/BSR/MCP (Monolithic Converter Products)

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