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TPS51916: PG pulled down when VTT starts up

Part Number: TPS51916

Hi Team

My customer spestech use TPS51916 in industrial PC, for DDR power supply.

When VTT power up, the PG drop can be tested, it will last for 1ms. below is the waveform, red line is PG yellow is VDDQSNS.

schematic is also attached:TPS51916 (1).pdf

what will cause this issue? since we didn't see VDDQSNS drop it is confusing.

thank you!

best regards


Nov 28