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TPS54622 EOS damage

canjun deng
Prodigy 10 points
Other Parts Discussed in Thread: TPS54622

Hi,

We use a DCDC chip TPS54622 failure, send your company Failure analysis is EN pin EOS failure,see attachment。

This is ourcircuit,

Our system requires the TPS54622 to start after the -5vand +5V start, so we use the circuit to determine whether -5V and +5V start.

6866.405534-1.pdfPlease help to confirm is there problem with this circuit?  is there any possible cause the EOS?

 

Best Regards

Gene Deng

  • 0
    TI__Genius 11095 points

    From the FA report, it looks like the EN pin either sourced or sunk too much current. The enable pin is not sized to handle much current, maybe only a few micro-amperes. The first thing I would recommend is to try adding a series resistor with D1, try 10k. 

    Can you show a typical start-up waveform with the +5V, -5V and the TPS54622 EN pin? At steady-state the circuit will do what you describe above, but there are a couple of transition points, depending on how its sequenced, i.e. (+5V is up, -5V is not), (-5V is up, +5V is not), (C1 finishes charging) etc... that should be looked at