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TPS6594-Q1: PMIC power up failure

Jack
Mastermind 9125 points
Part Number: TPS6594-Q1
Other Parts Discussed in Thread: TDA4VM, SK-TDA4VM

Tool/software:

Hi TPS6594  series  champ  for TDA4VM !

My customer built a circuit almost identical to the SK-TDA4VM board.

However, when the main power is applied, even though VCC-3.3V is supplied to the PMIC, except for some LDOs, the buck-boost DCDC converters do not output at all.

We removed the PMIC (TPS65941111/TPS65941213) from the SK-TDA4VM board and installed it on a newly assembled custom board, but the result was the same.

The nPWRON/ENABLE signal goes high, but it does not function normally. If the PMIC does not start, should I first check the capacitors on the PMIC input side or the output side?

Please advise on how to debug this.

Attached their PMIC part of the schematic.

pmic boot failure.pdf

Thanks.

Best Regards, 

Jack

  • 0
    TI__Genius 13850 points

    Hi Jack,

    Have you checked your connections based on https://www.ti.com/lit/ug/slvuc99a/slvuc99a.pdf user's guide for TPS65941213-Q1 and TPS65941111-Q1?

    I looked schematics and for example I'm not seeing VSYS_IO_3V3 is generated. PMIC-A will not complete power sequence is this monitored voltage is not rising. 

    Would also suggest to gather any scope shots from start-up event to identify at which point we are seeing issue. Also reading any interrupts will be helpful.

    Br, Jari