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TPS62175: TPS62175 VOS

Part Number: TPS62175

Dear Sir,

I use TPS62175 to desing a 12Vin to 3.3V/0.5A DC-DC Converter.

Initial I found switching frequency can't up to 1MHz(arround 820KHz) during Io=300mA.

I modify layout change VOS loop from near inductance to output cap.(C1401)  then switching freq. can up to 1MHz.

Why Io=300mA can't up to 1MHz(I saw datasheet page19 fig-27  Freq=1MHz) but change Vos loop can be up 1MHz.

Please you kindly review & advise.