TI UCC28810 100W PFC LED照明驱动方案
TI公司的UCC28810 和UCC28811是通用照明电源控制器,适合于需要功率因素修正和EMC兼容的中低功率亮度应用.
UCC28810/11可控制反激,降压或升压转换器.它还集成了用来处理反馈误差的跨导电压放大器,用来产生正比于输入电压的电流基准发生器,电流检测(PWM)比较器,PWM逻辑以及用来驱动外接FET的图腾柱驱动器.本文介绍了UCC28810 和UCC28811的主要特性,方框图和简化应用电路图,以及5W PFC反激转换器电路图, 用于LED照明的100W PFC AC/DC电路图和相应的材料清单(BOM).
The UCC28810 and UCC28811 are general lighting power controllers for low to medium power lumens applications requiring power factor correction and EMC compliance. It is designed for controlling a flyback, buck or boost converter operating in critical conduction mode. It features a transconductance voltage amplifier for feedback error processing, a simple current reference generator for generating a current command proportional to the input voltage, a current-sense (PWM) comparator, PWM logic and a totem-pole driver for driving an external FET.
In the critical conduction mode operation, the PWM circuit is self-oscillating with the turn-on being governed by a transformer zero energy detector (TZE pin) and the turn-off being governed by the current sense comparator. Additionally, the controller provides features such as peak current limit, restart timer, overvoltage protection (OVP), and enable...
