AOZ7111AI

AOZ7111 Critical Conduction Mode PFC Controller General Description Features The AOZ7111 is an active power factor correction (PFC) controller for boost PFC applications that operate in critical conduction mode (CRM). The device uses a voltage mode PWM which does not need rectified AC line voltage information, it saves the power loss of an input sensing network necessary for traditional currentmode CRM PFC controller. The AOZ7111 minimizes the number of external components by integrating safety features that make it an excellent choice for designing robust PFC stages.  No AC input voltage sensing requirement The AOZ7111 is available in a SO-8 package and it is rated over a -40°C to +125°C ambient temperature range.  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 Applications  Adapter / ballast  LCD TV / LED TV  SMPS Typical Application VOUT AOZ7111 VCC AC Line VCC Filter CT + OUT + INV COMP OVP CS GND Figure 1. Typical Boost PFC Application Rev. 1.0 January 2013 www.aosmd.com Page 1 of 15 AOZ7111 Ordering Information Part Number Ambient Temperature Range Package Environmental AOZ7111AI -40°C to +125°C SO-8 Green Product AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information. Pin Configuration INV 1 8 VCC CT 2 7 OUT COMP 3 6 GND OVP 4 5 CS SO-8 (Top View) Pin Description Pin Number Pin Name 1 INV Inverting input of the error amplifier. The output voltage of the boost PFC converter should be resistively divided to 2.5V. 2 CT The Ct pin sources a current to charge an external timing capacitor. The circuit controls the power switch on time by comparing the Ct voltage to an internal voltage derived from VCOMP. The Ct pin discharge the external timing capacitor at the end of the on time. 3 COMP 4 OVP 5 CS 6 GND The GND pin is analog ground. 7 OUT This pin is the gate drive output. 8 VCC This is the IC supply pin. Rev. 1.0 January 2013 Pin Function This pin is the output of the transconductance error amplifier. Components for the compensation should be connected between this pin and GND. The OVP pin is used to detect PFC output over-voltage when the INV pin information is not correct. This pin is the input of the zero current detection and over-current protection comparator. www.aosmd.com Page 2 of 15 AOZ7111 Absolute Maximum Ratings Exceeding the Absolute Maximum Ratings may damage the device. Symbol Min Max Units Supply Voltage -0.3 20 V IOH, IOL Peak Drive Output Current -800 +300 mA ICLAMP Driver Output Clamping Diode VO>VCC or VO2.6V, or VINV