What the VIPER06LS does in a power supply
The VIPER06LS is an offline switching regulator from STMicroelectronics' VIPer™ plus series, integrating the power MOSFET and controller in a single 10-SSOP package. It supports both buck and flyback topologies with an output power capability of 8 W, making it a fit for auxiliary supplies, appliance power boards, and industrial control bias rails. The internal 800 V avalanche-rugged MOSFET handles universal AC input (85–265 VAC) with derating margin, and the 60 kHz fixed switching frequency allows a compact transformer or inductor design. The 70% maximum duty cycle gives headroom for flyback designs with moderate input-output voltage differentials.
The 8 W power rating is the continuous output ceiling at the nominal input voltage — derate for ambient temperature above 25 °C and for lower input voltages. At 85 VAC input the available output power drops; the datasheet's power derating curve is the reference for your load budget. The 800 V breakdown voltage covers universal mains with a 400 VDC bus plus reflected voltage and leakage spikes in a flyback. The 11.5 V to 23.5 V Vcc supply range matches standard auxiliary windings; the 13 V start-up threshold ensures clean power-on sequencing without an external start-up resistor in many designs. Fault protection includes current limiting, open-loop detection, and over-temperature shutdown — the open-loop protection catches a broken feedback path before the output rises out of regulation.
The base product number VIPER06 covers the family; this 'LS' suffix variant is ROHS3 compliant and supplied in tubes. Sourced to order against BOM quantity — confirm the 10-SSOP footprint matches your PCB layout before committing.