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LP8860-Q1: charge pump frequency

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Part Number:LP8860-Q1

Hello TI Experts,

Can I know if  the boost switching frequency is related to the frequency of the charge pump frequency?

I met with a phenomenon that is really strange:

When VDD is 3.3V, and  charge pump is abled, the input voltage is descreased to 10V,if I change the switching frequency from 400KHz to 303KHz or 629KHz, the screen flickers~

But when VDD is 5V,  the input voltage is descreased to 10V,if I change the switching frequency from 400KHz to 303KHz or 629KHz, the screen willl not flicker~


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