Obsolete 16 W flyback — what it means for a repair or replacement BOM
The STMicroelectronics VIPER28LE is an 800 V avalanche-rugged monolithic flyback switcher from the VIPer plus series, integrating the PWM controller and power MOSFET in a single 10-SDIP through-hole package. It delivers 16 W in isolated flyback topology with 60 kHz fixed switching frequency, 80% duty cycle, and comprehensive fault protection including current limiting, over-temperature, over-voltage, and short-circuit on the output side.
800 V breakdown and 150°C junction — derating for industrial auxiliary supplies
The 800 V drain-source breakdown voltage gives headroom for universal AC input (85–265 VAC) flyback designs with reflected voltage and leakage spike. The 8.5 V to 23.5 V Vcc supply range with a 14 V startup threshold is typical for bias windings in offline flybacks — the startup resistor can be sized for a few milliamps because the controller takes over from the auxiliary winding once running.
Obsolete — last-time-buy and replacement reality
The VIPer plus series included multiple pin-compatible options in the same 10-SDIP footprint — the VIPER28HN (with higher power rating) and VIPER28HD (with different protection thresholds) were common variants, but their own lifecycle status must be verified independently.