FAN7930B — Critical Conduction Mode PFC Controller
November 2013
FAN7930B
Critical Conduction Mode PFC Controller
Features
Additional OVP Detection Pin
V
IN
-Absent Detection
Maximum Switching Frequency Limitation
Internal Soft-Start and Startup without Overshoot
Internal Total Harmonic Distortion (THD) Optimizer
Precise Adjustable Output Over-Voltage Protection
Open-Feedback Protection and Disable Function
Zero Current Detector (ZCD)
150 μs Internal Startup Timer
MOSFET Over-Current Protection (OCP)
Under-Voltage Lockout with 3.5 V Hysteresis
Low Startup and Operating Current
Totem-Pole Output with High State Clamp
+500/-800
mA Peak Gate Drive Current
8-Pin, Small-Outline Package (SOP)
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 (OVP),
open-feedback protection, over-current protection
(OCP), input-voltage-absent detection, and under-
voltage lockout protection (UVLO). 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 0.45 V and the operating current decreases
to a very low level. Using a new variable on-time control
method, total harmonic distortion (THD) is lower than in
conventional CRM boost PFC ICs.
Applications
Adapter
Ballast
LCD TV, CRT TV
SMPS
Related Resources
AN-8035 — Design Consideration for Boundary
Conduction Mode PFC Using FAN7930
Ordering Information
Part Number
FAN7930BMX_G
Operating
Temperature Range
-40 to +125°C
Top Mark
FAN7930BG
Package
8-Lead, Small-Outline Package (SOP)
Packing
Method
Tape & Reel
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.3
www.fairchildsemi.com
FAN7930B — Critical Conduction Mode PFC Controller
Application Diagram
DC OUTPUT
Vcc
Line Filter
AC INPUT
FAN7930B
8
5
3
V
CC
ZCD
COMP
GND OVP
Out
CS
INV
7
4
1
2
6
Figure 1.
Typical Boost PFC Application
Internal Block Diagram
V
CC
H:open
V
REF
V
CC
V
BIAS
2.5V
REF
Internal
Bias
8
V
CC
-
reset
V
Z
Clamp
Circuit
+
V
TH(S/S)
8.5
12
ZCD
5
-
+
V
TH(ZCD)
Restart
Tmer
f
MAX
Limit
THD
Optimized
Sawtooth
Generator
S
Control Range
Compensation
Q
V
CC
Gate
Driver
V
O(MAX)
7
OUT
+
-
Startup without
Overshoot
R
Q
40k
W
+
8pF
4
CS
-
INV
1
V
REF
V
REF
Stair
Step
-
+
Clamp
Circuit
reset
V
IN
Absent
V
CS_LIM
6
GND
COMP
3
disable
disable
V
REF
-
+
V
OVP,LH
Thermal
Shutdown
2.5
2.675
0.35
0.45
OVP
2
INV_open
OVP
disable
+
-
2.5
2.88
Figure 2.
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.3
Functional Block Diagram
www.fairchildsemi.com
2
FAN7930B — Critical Conduction Mode PFC Controller
Pin Configuration
V
CC
OUT
GND
ZCD
FAN7930BG
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
OVP
COMP
CS
ZCD
GND
OUT
V
CC
This pin is the inverting input of the error amplifier. The output voltage of the boost PFC converter
should be resistively divided to 2.5 V.
This pin is used to detect PFC output over voltage when INV pin information is not correct.
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
using a sensing resistor and the resulting voltage is applied to this pin. An internal RC filter is
included to filter switching noise.
This pin is the input of the zero-current detection (ZCD) block. If the voltage of this pin goes
higher than 1.5 V, then goes lower than 1.4 V, the MOSFET is turned on.
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.
This pin is the gate drive output. The peak sourcing and sinking current levels are +500 mA and
-800 mA, respectively. For proper operation, the stray inductance in the gate driving path must
be minimized.
This is the IC supply pin. IC current and MOSFET drive current are supplied using this pin.
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.3
www.fairchildsemi.com
3
FAN7930B — Critical Conduction Mode PFC 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
A
T
STG
ESD
Supply Voltage
Peak Drive Output Current
Parameter
Min.
-800
-10
-10
(1)
Max.
V
Z
+500
+10
+10
8.0
6.0
+150
+125
+150
2.5
2.0
Unit
V
mA
mA
mA
V
°C
°C
°C
kV
Driver Output Clamping Diodes V
O
>V
CC
or V
O
<-0.3 V
Detector Clamping Diodes
Error Amplifier Input, Output, OVP Input, ZCD Pins
CS Input Voltage
(2)
-0.3
-10.0
-40
-65
Operating Junction Temperature
Operating Temperature Range
Storage Temperature Range
Electrostatic Discharge
Capability
Human Body Model, JESD22-A114
Charged Device Model, JESD22-C101
Notes:
1. When this pin is supplied by external power sources by accident, its maximum allowable current is 50 mA.
2. In case of DC input, the acceptable input range is -0.3 V~6 V: within 100 ns -10 V~6 V is acceptable, but
electrical specifications are not guaranteed during such a short time.
Thermal Impedance
Symbol
JA
Parameter
Thermal Resistance, Junction-to-Ambient
(3)
Min.
150
Max.
Unit
°C/W
Note:
3. Regarding the test environment and PCB type, please refer to JESD51-2 and JESD51-10.
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.3
www.fairchildsemi.com
4
FAN7930B — Critical Conduction Mode PFC Controller
Electrical Characteristics
V
CC
= 14 V and T
A
= -40°C~+125°C, unless otherwise specified.
Symbol
V
CC
Section
V
START
V
STOP
HY
UVLO
V
Z
V
OP
I
START
I
OP
I
DOP
I
OPDIS
V
REF1
V
REF1
V
REF2
I
EA,BS
I
EAS,SR
I
EAS,SK
V
EAH
V
EAZ
g
m
Parameter
Start Threshold Voltage
Stop Threshold Voltage
UVLO Hysteresis
Zener Voltage
Recommended Operating Range
Startup Supply Current
Operating Supply Current
Operating Current at Disable
Conditions
V
CC
Increasing
V
CC
Decreasing
I
CC
=20 mA
Min.
11
7.5
3.0
20
13
Typ.
12
8.5
3.5
22
Max.
13
9.5
4.0
24
20
Unit
V
V
V
V
V
µA
mA
mA
µA
V
mV
mV
Supply Current Section
V
CC
=V
START
-0.2 V
Output Not Switching
V
INV
=0 V
90
2.465
120
1.5
2.5
160
2.500
0.1
20
V
INV
=1 V~4 V
V
INV
=V
REF
-0.1 V
V
INV
=V
REF
+0.1 V
V
INV
=1 V, V
CS
=0 V
6.0
0.9
90
-0.5
-12
12
6.5
1.0
115
7.0
1.1
140
0.5
190
3.0
4.0
230
2.535
10.0
Dynamic Operating Supply Current 50 kHz, C
I
=1 nF
Error Amplifier Section
Voltage Feedback Input Threshold1 T
A
=25°C
Line Regulation
Temperature Stability of V
REF1
Input Bias Current
Output Source Current
Output Sink Current
Output Upper Clamp Voltage
Zero Duty Cycle Output Voltage
Transconductance
(4)
(4)
V
CC
=14 V~20 V
µA
µA
µA
V
V
µmho
Maximum On-Time Section
t
ON,MAX1
t
ON,MAX2
Maximum On-Time Programming 1 T
A
=25°C, V
ZCD
=1 V
Maximum On-Time Programming 2
T
A
=25°C,
I
ZCD
=0.469 mA
35.5
11.2
41.5
13.0
47.5
14.8
µs
µs
Current-Sense Section
V
CS
I
CS,BS
t
CS,D
Current Sense Input Threshold
Voltage Limit
Input Bias Current
Current Sense Delay to Output
(4)
0.7
V
CS
=0~1 V
dV/dt=1 V/100 ns,
from 0 V to 5 V
-1.0
0.8
-0.1
350
0.9
1.0
500
V
µA
ns
Continued on the following page…
© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.3
www.fairchildsemi.com
5
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