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TPS23753 Startup waveform

PAN-M
Mastermind 8375 points
Other Parts Discussed in Thread: TPS23753A

2313.SW_StartUp.pdf

Hi

Please teach me about the rise waveform of TPS23753A.

There is 3ms stop switching timing when TPS23753A rise timing.(Pls. see attached file.)

Is this normal operation?

Thanks

PAN-M

  • 0
    TI__Mastermind 42795 points

    The description starts on pg 15 of the datasheet (Startup and Converter Operation). There is a "handoff" between primary Vc and secondary (CTL) towards the end of converter start up. If the output overshoots a bit, CTL will come down quickly as shown in your plot below Vzdc (~1.5V) and switching will stop until Vout droops sufficiently.

    Tuning secondary (error amp) soft start can help with this transition (see pg 18, figure 21 of the DS).

  • 0 in reply to Eric Wright
    Mastermind 8375 points

    Thank you for answer.

    I understood the "handoff".

    PAN-M