基于AOS AOZ7111AI 的高效率CRM模式PFC TV电源方案

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™ 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。