基于AOS AOZ7111AI 的高效率CRM模式PFC TV电源方案 电路方案

AOZ7111AI是一款工作在临界模式的功率因数校正电路控制芯片。应用在Boost模式PFC电路。传统的电流模式的CRM PFC需要从AC交流线采样,而AOZ7111AI则不需要,因而进一步降低了采样电路的功率损耗,有利于系统低待机功耗设计。AOZ7111AI内部集成了大量电路,从而最大限量地减少了外围电路器件的数量。同时,AOZ7111AI取消了ZCD采样,不需要过零检测,减低了PFC电感的复杂程度。具有过压保护电路,欠压保护和过流保护等保护电路。 核心技术优势 ●实现功率因数校正,降低系统THD值 ●降低系统EMI ●Max Frequency:350KHz ●internal soft-start function 方案规格 ● No AC input voltage sensing requirement ● AC Fault Detect:trade_mark: makes system more robust ● Maximum switching frequency limitation ● Additional OVP detection pin ● Output over-voltage / open-feedback protection and disable function ● Internal closed loop soft-start ● Dynamic OVP function ● Non-linear gain error amplifier enable fast line and load transient response ● No need for the auxiliary winding with minus current detection (ZCD) ● 150μs internal start-up timer ● MOSFET over-current protection and inductor saturation protection ● Under-voltage lockout with hysteresis ● Lower startup and operating current ● +300mA / -800mA peak gate drive current ● Thermal shutdown ● SO-8 package 方案来源于大大通。