ST8321 PSR Quasi-Resonant Flyback Controller
Specifications
Product details
Overview
The ST8321 is a primary-side feedback quasi-resonant (QR) AC/DC power supply controller that meets DOE Level VI energy efficiency standards for low-power applications. It integrates a 650V high-voltage power MOSFET for use in chargers, adapters and LED lighting, achieving ±5% CV/CC accuracy and less than 60mW standby power consumption; in constant-voltage mode it features built-in line-voltage compensation, and quasi-resonant control delivers high efficiency and excellent EMI performance. The chip integrates comprehensive protection features including VDD undervoltage lockout (UVLO), VDD overvoltage protection, soft-start, cycle-by-cycle over-current protection, all-pin floating protection, built-in leading-edge blanking, VDD voltage clamp protection and over-temperature protection.
Features
- Meets DOE Level VI energy efficiency standard
- Primary-Side Regulation (PSR) quasi-resonant (QR) control for high efficiency; no optocoupler or TL431 required
- ±5% CV/CC regulation accuracy
- Standby power consumption below 60mW
- Integrated 650V high-voltage MOSFET
- Built-in cable-drop compensation in CV mode
- Built-in soft-start
- All-pin floating protection
- Output over-voltage protection
- Cycle-by-cycle current limiting
- Built-in leading-edge blanking
- VDD UVLO, over-voltage protection and clamp
- Over-temperature protection
Typical Applications
- Chargers
- Adapters
- LED lighting
