UCC28722 - Texas Instruments

UCC28722 Constant-Current Controller

The UCC28722 flyback power supply controller provides isolated-output constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler. The device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Dynamically-controlled operating state.

Features

•1 < 50-mW No-Load Power
• Primary-Side Regulation (PSR) Eliminates Opto- Coupler
• Dynamic BJT Drive
• ± 5% Voltage and Current Regulation Across Line and Load
• 80-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs
• Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency
• Wide VDD Range Allows Small Bias Capacitor
• Output Overvoltage, Low-Line, and Overcurrent Protection Functions
• Programmable Cable Compensation
• SOT23-6 Package 2 Applications
• USB-Compliant Adapters and Chargers for Consumer Electronics
  – Smart Phones
  – Tablet Computers
  – Came.