FAN7527B — Power Factor Correction Controller
April 2013
FAN7527B
Power Factor Correction Controller
Features
Internal Startup Timer
Internal R/C Filter Eliminates the Need for External
R/C Filter
Precise Adjustable Output Over-Voltage Protection
Zero Current Detector
One Quadrant Multiplier
Trimmed 1.5% Internal Band Gap Reference
Under-Voltage Lockout with 3 V of Hysteresis
Totem-Pole Output with High-State Clamp
Low Startup and Operating Current
8-Pin SOP or 8-Pin DIP
Description
The FAN7527B provides simple and high-performance
active Power Factor Correction (PFC). The FAN7527B
is optimized for electronic ballasts and low–power, high-
density power supplies that require minimum board size,
reduced external components, and low power
dissipation. Because the R/C filter is included in the
current-sense block, an external R/C filter is not
necessary. Special circuitry prevents no-load runaway
conditions. Regardless of the supply voltage, the output
drive clamping circuit limits the overshoot of the power
MOSFET gate drive, which improves system reliability.
Applications
Electronic Ballast
SMPS
Ordering Information
Part Number
FAN7527BMX
FAN7527BN
Operating
Temperature Range
-25 to +125°C
-25 to +125°C
Package
8-Lead, Small Outline Package (SOP)
8-Lead, Dual Inline Package (DIP)
Packing Method
Tape and Reel
Tube
© 2003 Fairchild Semiconductor Corporation
FAN7527B • Rev. 1.0.3
www.fairchildsemi.com
FAN7527B — Power Factor Correction Controller
Block Diagram
Figure 1.
Block Diagram
© 2003 Fairchild Semiconductor Corporation
FAN7527B • Rev. 1.0.3
www.fairchildsemi.com
2
FAN7527B — Power Factor Correction Controller
Pin Configuration
Figure 2.
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
INV
EA_OUT
MULT
CS
Idet
GND
OUT
V
CC
Description
Inverting input of the error amplifier. The output of the boost converter should be resistively
divided to 2.5 V and connected to this pin.
Output of the error amplifier. Feedback compensation network is placed between this pin and
the INV pin.
Input to the multiplier stage. The full-wave rectified AC voltage is divided to less than 2 V and is
connected to this pin.
Input of the PWM comparator. The MOSFET current is sensed by a resistor and the resulting
voltage is applied to this pin. An internal R/C filter is included to reject high-frequency noise.
Zero Current Detection (ZCD) input.
Ground
Gate driver output. Push-pull output stage is able to drive the power MOSFET with a peak
current of 500 mA.
Supply voltage of driver and control circuits.
© 2003 Fairchild Semiconductor Corporation
FAN7527B • Rev. 1.0.3
www.fairchildsemi.com
3
FAN7527B — Power Factor Correction Controller
Absolute Maximum Ratings
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.
Symbol
V
CC
I
OH
, I
OL
I
CLAMP
I
DET
V
IN
T
J
T
OPR
T
STG
P
D
JA
Supply Voltage
Peak Drive Output Current
Parameter
Min.
Max.
30
±500
±10
±10
Unit
V
mA
mA
mA
V
°C
°C
°C
W
W
°C/W
°C/W
Driver Output Clamping Diodes V
O
> V
CC
or V
O
<-0.3 V
Detector Clamping Diodes
Error Amplifier Multiplier and Comparator Input Voltages
Operation Junction Temperature
Operating Temperature Range
Storage Temperature Range
Power Dissipation
Thermal Resistance Junction-Ambient
8-SOP
8-DIP
8-SOP
8-DIP
-25
-65
-0.3
6.0
+150
+125
+150
0.8
1.1
150
110
Temperature Characteristics
-25°C ≤ T
A
≤ 125°C.
Symbol
V
REF
K/T
Parameter
Temperature Stability Reference Voltage (V
REF
)
Temperature Stability for Multiplier Gain (K)
Min.
Typ.
20
-0.2
Max.
Unit
mV
% / °C
© 2003 Fairchild Semiconductor Corporation
FAN7527B • Rev. 1.0.3
www.fairchildsemi.com
4
FAN7527B — Power Factor Correction Controller
Electrical Characteristics
V
CC
= 14 V, -25°C ≤ T
A
≤ 125°C, unless otherwise stated.
Symbol
Under-Voltage Lockout
V
th(st)
H
Y(st)
Parameter
Conditions
Min.
Typ.
Max.
Unit
Start Threshold Voltage
UVLO Hysteresis
V
CC
Increasing
10.5
2
11.5
3
12.5
4
V
V
Supply Current Section
I
ST
I
CC
I
CC(OVP)
I
DCC
Startup Supply Current
Operating Supply Current
Operating Current at OVP
V
CC
= V
th(st)
-0.2 V
Output Not Switching
V
INV
= 3 V
10
60
3
1.7
4
100
6
4.0
8
µA
mA
mA
mA
Dynamic Operating Supply Current 50 kHz, C
I
= 1 nF
Error Amplifier Section
V
REF
V
FEF1
V
FEF3
I
b(ea)
I
SOURCE
I
SINK
V
EAO(H)
V
EAO(L)
G
V
PSRR
GBW
SR
Voltage Feedback Input Threshold
Line Regulation
Temperature Stability of V
REF(1)
Input Bias Current
Output Source Current
Output Sink Current
Output Upper Clamp Voltage
(1)
Output Lower Clamp Voltage
(1)
Large Signal Open-Loop Gain
(1)
Power Supply Rejection Ratio
(1)
Unity Gain Bandwidth
(1)
Slew Rate
(1)
14 V ≤ V
CC
≤ 25 V
V
M2
= 4 V
V
M2
= 4 V
I
SOURCE
= 0.1 mA
I
SINK
= 0.1 mA
60
60
I
REF
= 0 mA, T
A
= 25C
25°C ≤ T
A
≤ 125°C
14 V ≤ V
CC
≤ 25 V
-25°C ≤ T
A
≤ 125°C
-0.5
-2
2
-4
4
6
2.25
80
80
1
0.6
2.465
2.440
2.500
2.500
0.1
20
0.5
2.535
V
2.560
10.0
mV
mV
µA
mA
mA
V
V
dB
dB
MHZ
V/µs
Multiplier Section
I
b(m)
V
M1
V
M2
K
V
OMAX(m)
K/T
Input Bias Current (Pin 3)
M1 Input Voltage Range (Pin 3)
M2 Input Voltage Range (Pin 2)
Multiplier Gain
(1)
V
M1
= 1 V, V
M2
= 3.5 V
V
REF
0.36
1.65
0.44
1.80
-0.2
-0.5
0.5
3.8
V
REF
+2.5
0.52
1.95
µA
V
V
1/V
V
% / °C
Maximum Multiplier Output Voltage V
INV
=0 V, V
M1
= 4 V
Temperature Stability of K
(1)
-25 ≤ T
A
≤ 125°C
Current Sense Section
V
IO(CS)
I
b(CS)
t
D(CS)
Input Offset Voltage
(1)
Input Bias Current
Current Sense Delay to Output
(1)
V
M1
= 0 V, V
M2
= 2.2 V
0 V ≤ V
CS
≤ 1.7 V
-10
-1.0
3
-0.1
200
10
1.0
500
mV
µA
ns
Continued on the following page…
© 2003 Fairchild Semiconductor Corporation
FAN7527B • Rev. 1.0.3
www.fairchildsemi.com
5
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