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TPS62825: Change of switching frequency by capacitor at Vout

Part Number: TPS62825

Hello TI team,

I have a question about switching frequency of TPS62825.
In my condition, Vin=5V, Vout=1.0V, Iout=1.0A, C2(capacitor at Vout)=2x10uF, switching frequency is about 1.8MHz.
But additional capacitors are added at Vout, which is 2x10uF, switching frequency became 2.2MHz.
Could you tell me the mechanism why switching frequency became 2.2MHz?
(The above result is not simulated value but measured value with actual device.)

Regards,
Kei