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Part Number: UCD3138PSFBEVM-027


I am currently using the PSFB eval board for prototype testing. I noticed that when the board is powered up (with any voltage 30-350V), the VIN_SCALED signal is not a DC signal but is some periodic waveform (as shown in the picture below, time scaled is 500us). Is this normal? Shouldn't it be representing DC input voltage? I've checked DC in and VAUXS and 3.3V all are stable.

Please assist with this issue.