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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。
