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TPS92692-Q1: Startup issue

Part Number: TPS92692-Q1

Tool/software:

Hi teams,

The phenomenon of not boosting the voltage at the first shot of PWM was observed.
Since the soft-start time is 0.1 ms and the PWM ON time is about 0.8 ms, we think it is strange that the voltage is not boosted at all.

1) Is there a time requirement from the time VIN comes in until the device starts working?
2) Please advise how to improve the above phenomenon.

ex.)
The soft-start setting is too short and should be made longer.
VIN_ON to PWM_ON is too short in time.

Thanks.