https://www.futureelectronics.com/npi/power-integrations-innoswitch4-pro-flyback-switcher-ic  . DER-946Q describes a 10 W emergency power supply for 800 V BEV automotive applications.   It uses a 1700 V SiC-based InnoSwitch3-AQ flyback switcher IC and features reinforced 1000 V isolation that is IEC-60664-1 and IEC-60664-4 compliant.