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Fairchild Semiconductor
Fairchild Semiconductor

FAN7930B Datasheet

Critical Conduction Mode PFC Controller


FAN7930B Datasheet Preview


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
www.DataSheFetA4NU7.c9o3m0BM
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
Page 1

Application Diagram
Figure 1.
Internal Block Diagram
Typical Boost PFC Application
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© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.2
Figure 2. Functional Block Diagram
2
www.fairchildsemi.com
Page 2

Pin Configuration
VCC OUT GND ZCD
FAN7930B
8-SOP
INV OVP COMP CS
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name Description
INV
This pin is the inverting input of the error amplifier. The output voltage of the boost PFC converter
should be resistively divided to 2.5V.
OVP This pin is used to detect PFC output over voltage when INV pin information is not correct.
COMP
This pin is the output of the transconductance error amplifier. Components for the output voltage
compensation should be connected between this pin and GND.
This pin is the input of the over-current protection comparator. The MOSFET current is sensed
CS using a sensing resistor and the resulting voltage is applied to this pin. An internal RC filter is
included to filter switching noise.
ZCD
This pin is the input of the zero-current detection block. If the voltage of this pin goes higher than
1.5V, then goes lower than 1.4V, the MOSFET is turned on.
GND
This pin is used for the ground potential of all the pins. For proper operation, the signal ground
and the power ground should be separated.
OUT
This pin is the gate drive output. The peak sourcing and sinking current levels are +500mA and -
800mA, respectively. For proper operation, the stray inductance in the gate driving path must be
minimized.
VCC This is the IC supply pin. IC current and MOSFET drive current are supplied using this pin.
www.DataSheet4U.com
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.2
3
www.fairchildsemi.com
Page 3
Part Number FAN7930B
Manufactur Fairchild Semiconductor
Description Critical Conduction Mode PFC Controller
Total Page 22 Pages
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