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LT3752-1 hourse keeping power start up problem (SS1 reset)

Hi ADI members:

Attached file is my circuit: Vbus 380V /  24Vout which was modified from DC1929A circuit. Here is my problem: when 380V input, the house keeping power start switching. But the SS1 reset with the VHK = 13.8V. If I use external DC source to input VHK=13.9V & Vuvlo_vsec=1.3V , the SS1 can power up.

Would you please help.

Thank you

Ginger Lin

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