This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPA3255: Using PBTL mode

Part Number: TPA3255

The device generate a FAULT signal, and stop operation when output voltage level approach the supplied voltage.

The supplied voltage is set to 50 Vdc and upon the output voltage reaching ~45 V, the device cuts off. 

Reducing the supplied voltage to 45 Vdc, the cut-off occurs in 40 V, looks like around 5 Volts headroom ????

As output voltage approaching the supplied voltage, I expect to see some clipping on the output, but the device never get into clipping,
it just cuts-off, and recovers a second later. Keeping the the output voltage at the same level, will cause the device to tuns OFF and back
ON at a rate of about one sec.

I would appreciate any suggestion or hint for the possible reason for the described issue.

Best,

Ron

  • Hi Ron,

    Thanks for posting to the forum!

    It could be either over current or over temperature protection. Are you using the EVM or your own board?

    - Do you see the OTW signal go low (LED turn on)?
    - Is the device configured in latched or CB3C over current mode?

    If you could capture the output waveform during this event that would help us debug the issue quickly.

    Thanks,
    Brian