STMicroelectronics VIPER122LSTR Off-Line SMPS Primary Switcher

The VIPER122LSTR from STMicroelectronics is a high-performance, energy-efficient, off-line switched-mode power supply (SMPS) primary switcher IC designed for a wide range of applications. This robust component is part of the VIPerPlus family and is well-suited for converters that require an output power up to 8 W in wide-range mains operation, and up to 12 W with European mains. It is an ideal choice for power supply solutions in consumer electronics, home appliances, and industrial systems.

One of the key features of the VIPER122LSTR is its 800 V avalanche rugged power section, which ensures enhanced system reliability and robustness in harsh electrical environments. The device integrates a PWM controller and a high-voltage MOSFET in one package, which simplifies design and reduces component count, leading to cost-effective and compact power supply units.

The VIPER122LSTR boasts multiple protection features that safeguard the power supply and the load from various fault conditions. These include thermal shutdown with hysteresis, overvoltage protection, overload protection, and hysteretic overcurrent protection. These advanced protection mechanisms contribute to the long-term reliability of the end application by preventing damage due to abnormal operating conditions.

This IC operates at a fixed 60 kHz switching frequency with frequency jittering for lower EMI and features a low standby power consumption of less than 30 mW at 265 VAC. This makes the VIPER122LSTR an excellent choice for applications that require compliance with energy-saving regulations, such as the European CoC (Code of Conduct) for external power supplies and the U.S. Energy Star program.

The VIPER122LSTR is available in a compact SO-16N package, providing a space-saving solution for PCB layouts. Its extended temperature range of -40°C to +150°C ensures reliable operation across various environmental conditions. With its integrated features and protections, the VIPER122LSTR is a versatile and reliable choice for designers looking to create efficient and cost-effective power supplies.