FAN7528_07 Datasheet, PDF (1/21 Pages) Fairchild Semiconductor – Dual-Output, Critical Conduction Mode PFC Controller

February 2007
FAN7528
Dual-Output, Critical Conduction Mode PFC Controller
Features
„ Low Total Harmonic Distortion (THD)
„ Dual Output Voltage Control
„ Precise Adjustable Output Over-Voltage Protection
„ Open-Feedback Protection and Disable Function
„ Zero Current Detector
„ 160µs 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
„ ±400mA Peak Gate Drive Current
„ 8-Pin DIP or 8-Pin SOP
Applications
„ Adapter
Related Application Notes
„ AN-6012: Design of Power Factor Correction Circuit
Using FAN7528
Description
The FAN7528 is an active power factor correction (PFC)
controller for boost PFC applications that operates in
critical conduction mode (CRM). It uses 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 the rectified AC line voltage information, it can
save the power loss of the input voltage sensing network
necessary for the current mode CRM PFC controller.
The FAN7528 provides the dual-output voltage control
function without the AC line voltage sensing for adapter
applications. It changes the PFC output voltage accord-
ing to the AC line voltage.
It provides protection functions such as over-voltage pro-
tection, open-feedback protection, over-current protec-
tion, and under-voltage lockout protection. The FAN7528
can be disabled if the INV pin voltage is lower than 0.45V
and the operating current decreases to 65µA. Using a
new variable on-time control method, THD is lower than
the conventional CRM boost PFC ICs.
Ordering Information
Part Number
FAN7528N
FAN7528M
FAN7528MX
Operating Temp.
Range
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Pb-Free
Yes
Yes
Yes
Package
8-DIP
8-SOP
8-SOP
Packing Method
Rail
Rail
Tape & Reel
Marking
Code
FAN7528
FAN7528
FAN7528
© 2005 Fairchild Semiconductor Corporation
FAN7528 Rev. 1.0.6
www.fairchildsemi.com