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TPS62230: The reason to change the SW-freq by output load current.

Part Number: TPS62230

Hi,

According to TPS62230 datasheet P.19, Figure23, we understand switching frequency is changed by output load current.  Why is changed?   Please advise us.  As the background, my customer wants to reduce ripple near LDO (10mV). But target frequency is changed due to load.  That is why he asks.

Thanks and best regards,
M.HATTORI.