AOZ7111 Datasheet, PDF (1/15 Pages) Alpha & Omega Semiconductors – Critical Conduction Mode PFC Controller

AOZ7111
Critical Conduction Mode PFC Controller
General Description
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 current-
mode 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.
The AOZ7111 is available in a SO-8 package and it is
rated over a -40°C to +125°C ambient temperature
range.
Features
 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
Applications
 Adapter / ballast
 LCD TV / LED TV
 SMPS
Typical Application
Line
AC
Filter
VCC
+
AOZ7111
VCC
CT
COMP
CS
OUT
INV
OVP
GND
VOUT
+
Rev. 1.0 January 2013
Figure 1. Typical Boost PFC Application
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