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FAN7529 Critical Conduction Mode PFC Controller
April 2007
FAN7529
Critical Conduction Mode PFC Controller
Features
Low Total Harmonic Distortion (THD)
Precise Adjustable Output Over-Voltage Protection
Open-Feedback Protection and Disable Function
Zero Current Detector
150µs Internal Start-up Timer
MOSFET Over-Current Protection
Under-Voltage Lockout with 3.5V Hysteresis
Low Start-up (40µA) and Operating Current (1.5mA)
Totem Pole Output with High State Clamp
+500/-800mA
Peak Gate Drive Current
8-Pin DIP or 8-Pin SOP
Description
The FAN7529 is an active power factor correction (PFC)
controller for boost PFC applications that operates in crit-
ical conduction mode (CRM). It uses the voltage mode
PWM that compares an internal ramp signal with the
error amplifier output to generate MOSFET turn-off sig-
nal. Because the voltage-mode CRM PFC controller does
not need rectified AC line voltage information, it saves the
power loss of the input voltage sensing network neces-
sary for the current-mode CRM PFC controller.
FAN7529 provides many protection functions, such as
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