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.
The efficient system performance is attained by incorporation of zero power detect function which allows the controller output to shut down at light load conditions without running into overvoltage. The device also features an innovative slew rate enhancement circuit which improves the large signal transient performance of the voltage error amplifier. The low start-up and operating currents of the device result in low power consumption and ease of start-up. The highly-accurate internal bandgap reference leads to tight regulation of the output voltage in normal and OVP conditions, resulting in higher system reliability. The enable comparator e...