UCC28740D Datasheet PDF - TI

●DESCRIPTION

●The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to large load steps. Constant-Current (CC) regulation is accomplished through Primary-side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of

●output voltage and current.

●FEATURES

●• Less than 10-mW No-Load Power Capability

●• Opto-Coupled Feedback for CV, and Primary-Side Regulation (PSR) for CC

●• Enables ±1% Voltage Regulation and ±5% Current Regulation Across Line and Load

●• 700-V Startup Switch

●• 100-kHz Maximum Switching Frequency Enables High-Power-Density Charger Designs

●• Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency

●• Frequency Dithering to Ease EMI Compliance

●• Clamped Gate-Drive Output for MOSFET

●• Overvoltage, Low-Line, and Overcurrent Protection Functions

●• SOIC-7 Package

●APPLICATIONS

●• USB-Compliant Adapters and Chargers for Consumer Electronics

●– Smart Phones

●– Tablet Computers

●– Cameras

●• Standby Supply for TV and Desktop

●• White Goods