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ICE3PCS01G Vref(5v) not coming?

We have developed 2kW PFC Board with ICE3PCS01G.
When I did first power on with 12.15VDC,  Vref not coming from IC. After that I replace the new chip, then it worked fine. But again after changing the nearest components during troubleshooting, the same problem came (vref gone), But ICOMP=5V is coming. 4 nos of IC got damaged and the same problem coming.

please suggest a solution.

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