700 V breakdown in a monolithic flyback switcher
The STMicroelectronics VIPER100A is a monolithic flyback switching regulator from the VIPER™ series, integrating a 700 V avalanche-rugged Power MOSFET and current-mode PWM controller in a single Pentawatt-5 HV package with bent and staggered leads for surface-mount assembly. Rated for 100 W of output power, it supports switching frequencies up to 200 kHz, which lets the designer use a smaller transformer core than a 100 kHz design would allow.
Built-in control and protection reduce BOM count
The controller includes an internal start-up regulator (11 V start-up threshold), soft-start, frequency control, and an enable pin — features that eliminate several external bias and sequencing components. Fault protection covers current limiting and over-temperature shutdown, so the supply rail is self-protecting against output shorts and thermal runaway without a discrete sense resistor or thermistor.