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FAN7529
Critical Conduction Mode PFC Controller
Features
Description
Low Total Harmonic Distortion (THD)
The FAN7529 is an active power factor correction (PFC)
controller for boost PFC applications that operates in critical 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 signal. 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 necessary for the current-mode CRM PFC controller.
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
FAN7529 provides many protection functions, such as
over-voltage protection, open-feedback protection, overcurrent protection, and under-voltage lockout protection.
The FAN7529 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.
+500/-800mA Peak Gate Drive Current
8-Pin DIP or 8-Pin SOP
Applications
Adapter
Ballast
LCD TV, CRT TV
SMPS
Related Application Notes
AN-6026 - Design of Power Factor Correction Circuit
Using FAN7529
Ordering Information
Part Number
Operating Temp.
Range
Pb-Free
Package
Packing Method
Marking
Code
FAN7529N
-40°C to +125°C
Yes
8-DIP
Rail
FAN7529
FAN7529M
-40°C to +125°C
Yes
8-SOP
Rail
FAN7529
FAN7529MX
-40°C to +125°C
Yes
8-SOP
Tape & Reel
FAN7529
© 2006 Fairchild Semiconductor Corporation
FAN7529 Rev. 1.0.2
www.fairchildsemi.com
FAN7529 Critical Conduction Mode PFC Controller
April 2007
FAN7529 Critical Conduction Mode PFC Controller
Typical Application Diagrams
L
VO
D
AC
IN
NAUX
VAUX
RZCD
R2 ZCD
CO
VCC
FAN7529
INV
MOT
CS
COMP
R1
GND
FAN7529 Rev. 00
Figure 1. Typical Boost PFC Application
Internal Block Diagram
2.5V
Ref
VCC 8
UVLO
12V
8.5V
Vref1
VCC
Internal
Bias
Drive
Output
Disable
7 OUT
Timer
ZCD 5
S
6.7V
Q
1.4V 1.5V
R
Zero Current
Detector
CS
OVP
4
Disable
40k
8pF
0.8V
Ramp
Signal
Saw Tooth
MOT 3
Generator
2.9V
2.675V
2.5V
0.45V 0.35V
Current Protection
Comparator
Vref1
1V Offset
Error
Amplifier
Gm
1V~5V
Range
1 INV
2
6
GND
COMP
FAN7529 Rev. 00
Figure 2. Functional Block Diagram of FAN7529
© 2006 Fairchild Semiconductor Corporation
FAN7529 Rev. 1.0.2
www.fairchildsemi.com
2
VCC
OUT
GND
ZCD
8
7
6
5
YWW
FAN7529
1
2
3
4
INV
COMP
MOT
CS
FAN7529 Rev. 00
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
Description
1
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.
2
COMP
This pin is the output of the transconductance error amplifier. Components for output
voltage compensation should be connected between this pin and GND.
3
MOT
This pin is used to set the slope of the internal ramp. The voltage of this pin is maintained at 2.9V. If a resistor is connected between this pin and GND, current flows out of
the pin and the slope of the internal ramp is proportional to this current.
4
CS
This pin is the input of the over-current protection comparator. The MOSFET current is
sensed using a sensing resistor and the resulting voltage is applied to this pin. An
internal RC filter is included to filter switching noise.
5
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.
6
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.
7
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.
8
VCC
This pin is the IC supply pin. IC current and MOSFET drive current are supplied using
this pin.
© 2006 Fairchild Semiconductor Corporation
FAN7529 Rev. 1.0.2
www.fairchildsemi.com
3
FAN7529 Critical Conduction Mode PFC Controller
Pin Assignments
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. TA = 25°C unless otherwise specified.
Symbol
VCC
IOH, IOL
Iclamp
Parameter
Supply Voltage
Peak Drive Output Current
Driver Output Clamping Diodes VO>VCC or VO90% at 85VAC input)
Low Total Harmonic Distortion (THD) (
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