UCC28720

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community UCC28720 SLUSBE8B – MAY 2013 – REVISED SEPTEMBER 2015 UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation 1 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 computers – Cameras Standby Supply for TV and Desktop White Goods 3 Description 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, dynamicallycontrolled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response. Control algorithms in the UCC28720 allow operating ...