TIUCC28180满负荷效率高达95%的PFC控制方案选读.docx

TI UCC28180满负荷效率高达95%的PFC控制方案关键词：电源管理,AC/DV转换器,PFC,UCC28180TI公司的UCC28180是工作在连续导通模式(CCM)的PFC控制器,可得到高的电源效率,低电流失真和极好的电压调整,非常适合于100瓦到几千瓦的AC/DC转换器,开关频率从18kHz到250kHz,支持功率MOSFET和IGBT开关,主要用在服务器和台式电源,白色家电,工业电源和平板电视如PDP,LCD和LED TV．本文介绍了UCC28180主要特性，框图,以及360W评估板UCC28180EVM-573主要特性,电路图,测试连接图,材料厂清单和PCB元件布局图.　The UCC28180 is a flexible and easy-to-use, 8-pin, active Power Factor Correction (PFC) controller that operates under Continuous Conduction Mode (CCM) to achieve high Power Factor, low current distortion and excellent voltage regulation of boost pre-regulators in AC - DC front-ends. The controller is suitable for universal AC input systems operating in 100-W to few-kW range with the switching frequency programmable between 18 kHz to 250 kHz, to conveniently support both power MOSFET and IGBT switches. An integrated 1.5-A and 2-A (SRC-SNK) peak gate drive output, clamped internally at 15.2 V (typical), enables fast turn-on, turn-off and easy management of the external power switch without the need for buffer circuits.Low-distortion wave shaping of the input current using average current mode control is achieved without input line sensing, reducing the external component count. In addition, the controller features reduced current sense thresholds to facilitate the use of small value shunt resistors for reduced power dissipation, especially important in high power systems. To enable low current distortion, the controller also features trimmed internal current loop regulation circuits for eliminating associated inaccuracies.Simple external networks allow for flexible compensation of the current and voltage control loops. In addition, UCC28180 offers an enhanced dynamic response circuit that is based on the voltage feedback signal to deliver improved response under fast load transients, both for output over-voltage and under-voltage conditions. An unique VCOMP discharge circuit provided in UCC28180 is activated whenever the voltage feedback signal exceeds VOVP_L?thus allowing a