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UCC28742：Exception occurred while driving MOSFET.

Nathan
Prodigy 10 points
Part Number: UCC28742

Documents share with TI.zip5758.photo.zip

原理图、PCB图和测试设备都在附件中。当用隔离探头同时测量UCC28742控制的MOS管的Vgs和Vds时，电路板爆炸。请解释和分析这一现象。注意：在PCBA中使用其他品牌的电源管理芯片时，不存在这种现象。

 

  • 0
    TI__Mastermind 24375 points

    Hi Nathan,

    Thank you for the query on UCC28742.

    The explosion could be possible due to few reasons. It could be MOSFET which has exploded or the controller also.

    1. The probing and produce undershoots and overshoots on the Vgs waveform. If these are above the abs max rating of the deive (MOSFET/ controller), it can get damaged.

    2. If it is the controller which explodes, it can be due to different abs max which each device can endure. So you might want to check this.

    3. I would recommend tying a resistor (100ohm / 1k resistor) to the probe leads, to dampen thse oscillations and see if this helps.

    Regards,

    Harish