InnoSwitch3-EP Family INN3694C The power supply does not work at temperatures below -35 ° C!!!!!!

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We really want to start serial production of electricity meters, the main requirement is operation at a temperature of -40 ° C, during tests the power supply cannot start, there are cyclic start attempts. diagram in the application and calculation in the application please tell me what I did wrong? We really hope for your help !!!! The denominations of the parts in the diagram, Help please

Hi Sulim,

Thank you for using Power Integrations products.
Capacitance change is one of the things affected when operating at extreme temperatures.
Can you verify if the capacitors used for BPP and BPS capacitors are X7R rated and at least 25V as recommended in the InnoSwitch3 product datasheet?