FAN7930B Datasheet, PDF (1/22 Pages) Fairchild Semiconductor – Critical Conduction Mode PFC Controller

October 2010
FAN7930B
Critical Conduction Mode PFC Controller
Features
ƒ Additional OVP Detection Pin
ƒ Input Voltage Absent Detection Circuit
ƒ Maximum Switching Frequency Limitation
ƒ Internal Soft-Start and Overshoot-less Control
ƒ Internal Total Harmonic Distortion (THD) Optimizer
ƒ Precise Adjustable Output Over-Voltage Protection
ƒ Open-Feedback Protection and Disable Function
ƒ Zero Current Detector
ƒ 150μs Internal Startup Timer
ƒ MOSFET Over-Current Protection
ƒ Under-Voltage Lockout with 3.5V Hysteresis
ƒ Low Startup and Operating Current
ƒ Totem-Pole Output with High State Clamp
ƒ +500/-800mA Peak Gate Drive Current
ƒ 8-Pin Small Outline Package (SOP)
Applications
ƒ Adapter
ƒ Ballast
ƒ LCD TV, CRT TV
ƒ SMPS
Description
The FAN7930B is an active power factor correction
(PFC) controller for boost PFC applications that
operate in critical conduction mode (CRM). It uses a
voltage-mode PWM that compares an internal ramp
signal with the error amplifier output to generate a
MOSFET turn-off signal. Because the voltage-mode
CRM PFC controller does not need rectified AC line
voltage information, it saves the power loss of an input
voltage sensing network necessary for a current-mode
CRM PFC controller.
FAN7930B provides over-voltage protection, open-
feedback protection, over-current protection, input-
voltage-absent detection, and under-voltage lockout
protection. The additional OVP pin can be used to shut
down the boost power stage when output voltage
exceeds OVP level due to the resistors that are
connected at INV pin are damaged. The FAN7930B can
be disabled if the INV pin voltage is lower than 0.45V
and the operating current decreases to a very low level.
Using a new variable on-time control method, THD is
lower than the conventional CRM boost PFC ICs.
Related Resources
AN-8035 — Design Consideration for Boundary
Conduction Mode PFC Using FAN7930
Ordering Information
Part Number
Operating
Temperature
Range
FAN7930BM
FAN7930BMX
-40 to +125°C
Top Mark
Package
FAN7930B 8-Lead Small Outline Package (SOP)
Packing
Method
Rail
Tape & Reel
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.2
www.fairchildsemi.com