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TPS54326: delay time between VIN & VREG5

Part Number: TPS54326

Hi team,

Could you please check the waveform below and comment on why the delay time between VIN and VREG5 is so long? Thanks!

The test condition: VIN= 5V, VOUT= 1.2V and the load= 1.75A.

(We know the PGOOD issue can be solved by connecting the pull-up resistor to VREG5)

CH1:5VSB (VIN), CH2:U57 pin3 (VREG5), CH3:V1P2S_POK (PGOOD) CH4: V1P2S_EN (EN)

Schematic:

Best regards,

Sam Ting