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PMP9774: PMP9774-Snusoidal signal

Part Number: PMP9774
Other Parts Discussed in Thread: OPA4377

When we input sinusoidal signal (such as 1KHz signal) on PMP9774 EVM board, we found that the negative half cycle of the signal was not flipped but cut off, so that the part of the cut signal could not be fed back to FB and the correct DCDC output voltage could not be obtained.How can I amplify the negative half cycle waveform?Is there any problem with OPA4377 connection?