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UCC3895: how to prevent Surge L-PE +/- 4KV?

Jamie Tseng
Intellectual 2405 points
Part Number: UCC3895

Hi Team,

UCC3895 VDD will short to ground when doing the Surge L-PE +/- 4KV test.

Is there any way to prevent the UCC3895 broke from Surge L-PE +/- 4KV?

Thanks and best regards,

Jamie

  • 0
    TI__Mastermind 31580 points

    Hi Jamie,

    I have assigned an applications engineer to respond to your question you should see a respond by tomorrow.

    Regards

    Peter

  • 0 in reply to Peter Meaney
    TI__Mastermind 25570 points

    Hi Jamie

    Assuming that there is a boost PFC stage feeding its output to the UCC3895 power stage I'd look at the following.

    1/ Do surge testing at a reduced voltage which does not damage the controller until the problem area has been identified and some corrective actions taken -

    2/ How is the VCC rail to the UCC3895 generated ? can you add a resistor in series with the VDD rail ?

    3/ Can you reduce the stray capacitance between the PE and GND/PGND ?

    4/ Is there a voltage difference between PGND and GND of the IC

    Can you send me the PCB layout (Gerber files) and the schematic, that would allow me to make better recommendations. You can send them to me directly at  colingillmor@ti.com

    Regards
    Colin

  • 0 in reply to Colin Gillmor
    TI__Mastermind 25570 points

    Hi Jamie

    You haven't replied in a while so I am assuming you have solved the problems. Please feel free to open a new - linked - thread if you need to discuss this issue further.

    Regards

    Colin