SN57 Overview
SN57 is a high performance offline PSR power switch for low power AC/DC charger and adapter applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated.
SN57 Key Features
- Primary-side sensing and regulation without TL431 and opto-coupler
- High precision constant voltage and current regulation at universal AC input
- Multi-mode PWM/PFM operation for efficiency improving
- Quasi-resonant operation for highest overall efficiency
- Programmable CV and CC regulation
- Built-in line voltage and primary winding
- Programmable cable drop pensation
- No need for control loop pensation
- Audio noise free operation
- Internal BJT switch