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TPS62135: Switching frequency

Part Number: TPS62135

Hi,

We got a question from the customer about TPS62135.
Could you help us?

[Question]
They measured the switching frequency in PWM(Mode pin is high) and PWM/PFM mode(Mode pin is low). Please refer to below plot. As you can see the switching frequency is different between these mode. Why is this occured?

Best Regards,
tateo