基于AOS AOZ7111AI 的高效率CRM模式PFC TV電源方案

AOZ7111AI是一款工作在臨界模式的功率因數(shù)校正電路控制芯片。應(yīng)用在Boost模式PFC電路。傳統(tǒng)的電流模式的CRM PFC需要從AC交流線采樣，而AOZ7111AI則不需要，因而進(jìn)一步降低了采樣電路的功率損耗，有利于系統(tǒng)低待機(jī)功耗設(shè)計(jì)。AOZ7111AI內(nèi)部集成了大量電路，從而最大限量地減少了外圍電路器件的數(shù)量。同時(shí)，AOZ7111AI取消了ZCD采樣，不需要過零檢測，減低了PFC電感的復(fù)雜程度。具有過壓保護(hù)電路，欠壓保護(hù)和過流保護(hù)等保護(hù)電路。

核心技術(shù)優(yōu)勢

●實(shí)現(xiàn)功率因數(shù)校正，降低系統(tǒng)THD值

●降低系統(tǒng)EMI

●Max Frequency：350KHz

●internal soft-start function

方案規(guī)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 

方案來源于大大通。