Flyback regulator for isolated supplies — 20 W, 700 V breakdown
The STMicroelectronics VIPER20A-22-E is a monolithic flyback switching regulator from the VIPER™ series, integrating the power switch and control logic in a single surface-mount Pentawatt-5 HV package with bent and staggered leads. It delivers up to 20 W of isolated output power and is rated for a 700 V breakdown voltage, switching at frequencies up to 200 kHz.
The 20 W output power and 700 V breakdown voltage define the primary-side stress envelope — this part suits off-line flyback supplies for auxiliary and bias rails in industrial and consumer equipment. The 8 V to 15 V Vcc range and 11 V start-up threshold are standard for self-supplied converters; the built-in current limiting and over-temperature protection eliminate external sense components.
Package reality — Pentawatt-5 HV staggered leads
The Pentawatt-5 HV package uses bent and staggered leads to increase creepage distance for high-voltage applications. It is classified as surface mount, but the staggered footprint differs from a standard SOIC or DPAK — verify the PCB land pattern against the mechanical drawing before committing a replacement or rework.
Sourcing is limited to independent distribution — surplus, new-old-stock, or broker lots.