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TPS63020: switching frequency

Part Number: TPS63020

Tps63020 switching frequency is fixed 2.4m, my VIN range is 2.5-5, Vout = 3.3V, IOUT = 1a, the front with a DC / DC - switching frequency 1.2m output 5V, as the tps63020 input, found that tps63020 no output, the front DC / DC switch frequency of 400k material, tps63020 output normal, please help analyze the reasons?