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UC2845A: start-up time

Part Number: UC2845A

Hi, Team.

i've been asked by Customer as below.

1. is it realistically happened that It takes 20sec for start up time as below condition.


start up R...188kohm(there are 4 resister(47k) in series.

Cap for Vcc..470uF

basically it takes 4sec for start up time but customer has seen that it took 20sec just one time.

i know it is difficult to assume though, what root cause can we expect ?

when customer replaced cap for Vcc, customer had seen it one time never happened ever.