800 V breakdown — the input-voltage ceiling
The VIPER013HSTR is an STMicroelectronics offline switching regulator with an integrated 800 V avalanche-rugged power MOSFET. The internal switch handles up to 7 W of output power across buck, buck-boost, or flyback configurations. At 120 kHz switching frequency, the transformer or inductor shrinks compared to a 60 kHz design, which helps fit the supply into a compact 10-SOP footprint.
Junction temperature and protection — where the part survives
The built-in fault protection (current limiting, over-temperature, over-voltage, short circuit) means the IC handles its own fault detection; you do not need an external comparator or supervisor for basic protection. The start-up voltage is 8 V, and the Vcc supply range runs from 4.5 V to 30 V, which gives the bias winding plenty of headroom to keep the controller alive under load transients.
Cut Tape options are also listed for prototyping quantities.