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TPS62060: The output current of TPS62060 undulates

Part Number: TPS62060

TPS62060,we use it to tranfer 3.3V input to 1.2V output, and it is supplied to DSP core, when the funcion mode of dsp is change suddenly, the output current ot TPS62060 changes from  0.7 to 1.1, and it causes 3.3V input unstable, so please help analyze the reason, thanks.