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TPS92641EVM: TPS92641 HG/LG abnormal

Lin Hsian
Expert 1580 points
Part Number: TPS92641EVM

Hi,

Customer follow PMP8016 EVM board(PMP8016 circuit) to layout as attached file.

And output abnormal seems into IC protection mode as below:

Only circuit change in C28 from 1uF to 2.2uF due to charge voltage to gain to higher.

 

Any suggest to overcome this issue ?

 

Warm Regards,

Kevin LinPMP8016 circuit.pdf

TPS92641 circuit.pdf

  • 0
    Expert 1580 points
    By the way, the channel definition as below:

    CH1=HG
    CH2=LG
    CH3=IADJ
    CH4=ILED
  • 0 in reply to Lin Hsian
    TI__Mastermind 28655 points
    Hello Lin,

    Can you get an oscilloscope picture of the high and low gate at a lower time-base to see if both MOSFET are on at the same time? It looks like the upper MOSFET short protection is getting met causing the long off-time.

    Also, when taking oscilloscope pictures can you turn off persistence so only one scan is showing on the picture, not overlapped waveforms?

    Best Regards,
  • 0 in reply to Irwin Nederbragt
    Expert 1580 points

    Hi,

    Correct the waveform(adjust Iadj lower than 1.6V)

  • 0 in reply to Lin Hsian
    TI__Mastermind 28655 points
    Hello Lin,

    I cannot tell what the oscilloscope picture shows, from my previous post:

    "Hello Lin,

    Can you get an oscilloscope picture of the high and low gate at a lower time-base to see if both MOSFET are on at the same time? It looks like the upper MOSFET short protection is getting met causing the long off-time.

    Also, when taking oscilloscope pictures can you turn off persistence so only one scan is showing on the picture, not overlapped waveforms?

    Best Regards,"

    The oscilloscope picture should show only one sweep, I have no idea what the above picture shows since it is multiple sweeps.

    The oscilloscope picture should be focused on the turn-on and turn-off edges of the MOSFET HG and LG gate signals (two pictures will be needed).

    Best Regards,
  • 0 in reply to Irwin Nederbragt
    TI__Mastermind 28655 points
    Hello Lin,

    I haven’t heard back from you, I’m assuming you were able to resolve your issue.
    If not, just post a reply below (or create a new thread if the thread has locked due to time-out)

    Best Regards,