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TPS53622: actual frequency lower than setting

Part Number: TPS53622

Hi team,

My customers measured the SW waveform of TPS53622, didn't connect CPU load.

They found the actual SW frequency is only 556kHz, lower than the setting value 800kHz. They also measured other rails, the frequency was setting value ~800kHz.

What's the problem with this rail? What cause the frequency gap? Appreciate your comments!