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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(guò)零檢測(cè)，減低了PFC電感的復(fù)雜程度。具有過(guò)壓保護(hù)電路，欠壓保護(hù)和過(guò)流保護(hù)等保護(hù)電路。
核心技術(shù)優(yōu)勢(shì)
●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(lái)源于大大通。
