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UCC24624: No gate signal

Part Number: UCC24624

Hi 

My customer used UCC24624 for 48V output application,

The VDD and Vreg >12V, but there has no gate signal,

The schematic and layout as below, please help to check there has any solution, thanks.

R69, R71  1k

Q6,Q11  150V  RON=15mR

R60 68  20k

R70,61   2R

C42  2.2U

R47  0R

C40  1U

ZD2  X

R107  10R

ZD5  30V