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L6599 LLC resonant converter start up issue

LChun.1
Associate
  1. Apply 15V at Vcc pin
  2. Apply 50V at top of potential divider formed by 6M6 and 180k ohm at LINE pin

in order to get LINE pin voltage >1.23V

However, High side LLC mosfet (connected to HVG pin, on resistance: 47ohm, off resistance 10ohm)

GS pin is shorted with near 50ohm (mosfet gs pin damage) after step 1 and 2.

Please help to provide cause and solution.

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