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UCC28951-Q1: Burn issue in high side mosfets

Rudra Prakash
Intellectual 370 points
Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28951, UCC28950, UCC27714

Hi,

One customer is working on PSFB converter for 800W battery charger design using controller UCC28951; and in light load or no-load condition, high side MOSFETs in both legs got burned. Nominal Vin=390V, Vout=48V.

Could you please help me to find out what could be a possible reason? 

Thanks & Regards,

Rudra Prakash

  • 0
    TI__Mastermind 25570 points

    Hello Ruda

    The likely reason is incorrect gate drive. The customer should review their schematic and measure the gate drive waveforms on both high side and low side MOSFETs.

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Intellectual 370 points

    Hello Sir,

    Thanks for your help. Currently, we have a partial schematic, after reviewing the complete schematic if I will have any doubt, will get back to you. 

    I have one more thing, actually, I am also working on a similar type of project. I am using half-bridge drivers to drive the MOSFETs, for now, I am avoiding to use an isolator. So there is no isolation between controller UCC28950 and half-bridge driver UCC27714. I have modified all the components connected to UCC27714 (as per calculation given in datasheet). When I did simulation I am not getting correct pulses from the half-bridge driver outputs for output M1 and M3 (shown in attached file). Could you please help me with this?

    M1 & M3 are higher side switches.

    M2 & M4 lower side switches.

    HI1, LI2 and HI3, LI4 are inputs going into the half-bridge driver to drive M1, M2 and M3, M4.

    Thanks & Regards,

    Rudra Prakash

  • 0 in reply to Rudra Prakash
    Intellectual 370 points

    Hello Sir,

    This issue has been resolved, thanks for the help.

    Thanks & Regards,

    Rudra Prakash