UCC28720 - Texas Instruments

UCC28720 Constant-Current Controller

The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. An internal 700-V start-up switch, dyna.

Features

•1 < 10-mW No-Load Power
• Primary-Side Regulation (PSR) Eliminates Opto- Coupler
• ±5% Voltage and Current Regulation Across Line and Load
• 700-V Start-Up Switch
• 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
• Dynamic BJT Drive
• Overvoltage, Low-Line, and Overcurrent Protection Functions
• Programmable Cable Compensation
• SOIC-7 Package 2 Applications
• USB-Compliant Adapters and Chargers for Consumer Electronics
  – Smart phones
  – Tablet c.