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TPS61378-Q1: Waveform at FREQ pin

Part Number: TPS61378-Q1

Hi experts,

Do you have a test waveform of TPS61378-Q1 FREQ pin during device normal operation? Below is what we measured on customer’s board. The output voltage is normal but customer has question about the FREQ  waveform. There are many voltage spikes on the waveform, is it reasonable? Could you please help to explain the principle of setting the switching frequency by FREQ resistor? Thank you.

Arie