PWM Controller for Ultra-Low Standby Adapters

The STCH02 from STMicroelectronics is a quasi-resonant controller specifically designed for ultra-low standby power supplies. Applications are expected to include ac-dc chargers for smartphones, tablets, camcorders and other handheld equipment and ac-dc adapters for set-top boxes and similar devices.

The built-in HV start-up cell with zero power consumption, the fully-integrated blocks for primary side constant current output regulation and the advanced power management make this IC suitable to build a high efficiency and ultra-low standby consumption power supply, with high overall and excellent dynamic performances.

Features include: Advanced power management for ultra-low standby power consumptions (under 10mW at 230Vac); Fully integrated primary side constant current output regulation (CC); 650V embedded HV start-up circuit with zero power consumption; Quasi resonant (QR) zero voltage switching (ZVS) operation; Automatic self-supply; Accurate and adjustable output OVP with auto restart after fault; Input voltage feedforward compensation for mains-independent CC regulation; Intelligent frequency jitter for EMI suppression; and delivered in a SO-8 package.