FAN7930C — Critical Conduction Mode PFC Controller
October 2010
FAN7930C
Critical Conduction Mode PFC Controller
Features
PFC-Ready Signal
Input Voltage 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)
150μs Internal Startup Timer
MOSFET Over-Current Protection (OCP)
Under-Voltage Lockout with 3.5V Hysteresis
Low Startup and Operating Current
Totem-Pole Output with High State Clamp
+500/-800mA
Peak Gate Drive Current
8-Pin SOP
Description
The FAN7930C 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.
FAN7930C provides over-voltage protection (OVP),
open-feedback protection, over-current protection
(OCP), input-voltage-absent detection, and under-
voltage lockout protection (UVLO). The PFC-ready pin
can be used to trigger other power stages when PFC
output voltage reaches the proper level with hysteresis.
The FAN7930C 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
Applications
Adapter
Ballast
LCD TV, CRT TV
SMPS
Ordering Information
Part Number
FAN7930CM
FAN7930CMX
Operating
Temperature Range
-40 to +125°C
Top Mark
FAN7930C
Package
8-Lead Small Outline Package (SOP)
Packing
Method
Rail
Tape & Reel
© 2010 Fairchild Semiconductor Corporation
FAN7930C • Rev. 1.0.0
www.fairchildsemi.com
FAN7930C — Critical Conduction Mode PFC Controller
Application Diagram
Figure 1.
Typical Boost PFC Application
Internal Block Diagram
Figure 2.
Functional Block Diagram
© 2010 Fairchild Semiconductor Corporation
FAN7930C • Rev. 1.0.0
www.fairchildsemi.com
2
FAN7930C — Critical Conduction Mode PFC Controller
Pin Configuration
Figure 3.
Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name Description
INV
RDY
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 2.5V.
This pin is used to detect PFC output voltage reaching a pre-determined value. When output
voltage reaches 89% of rated output voltage, this pin is pulled HIGH, which is an (open-drain)
output type.
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 block. If the voltage of this pin goes higher than
1.5V, then goes lower than 1.4V, 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 +500mA and
-800mA, 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
FAN7930C • Rev. 1.0.0
www.fairchildsemi.com
3
FAN7930C — 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
<-0.3V
Detector Clamping Diodes
Error Amplifier Input, Output, ZCD and RDY Pin
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 50mA.
2. In case of DC input, acceptable input range is -0.3V~6V: within 100ns -10V~6V is acceptable, but electrical
specifications are not guaranteed during such a short time.
Thermal Impedance
Symbol
Θ
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
FAN7930C • Rev. 1.0.0
www.fairchildsemi.com
4
FAN7930C — Critical Conduction Mode PFC Controller
Electrical Characteristics
V
CC
= 14V, 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
ΔV
REF1
ΔV
REF2
I
EA,BS
I
EAS,SR
I
EAS,SK
V
EAH
V
EAZ
g
m
t
ON,MAX1
t
ON,MAX2
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
=20mA
Min.
11
7.5
3.0
20
13
Typ.
12
8.5
3.5
22
Max.
13
9.5
4.0
24
20
Units
V
V
V
V
V
µA
mA
mA
µA
V
mV
mV
µA
µA
µA
Supply Current Section
V
CC
=V
START
-0.2V
Output Not Switching
V
INV
=0V
90
2.465
120
1.5
2.5
160
2.500
0.1
20
V
INV
=1V~4V
V
INV
=V
REF
-0.1V
V
INV
=V
REF
+0.1V
V
INV
=1V, V
CS
=0V
6.0
0.9
90
35.5
11.2
-0.5
-12
12
6.5
1.0
115
41.5
13.0
7.0
1.1
140
47.5
14.8
0.5
190
3.0
4.0
230
2.535
10.0
Dynamic Operating Supply Current 50kHZ, C
I
=1nF
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
=14V~20V
V
V
µmho
µs
µs
Maximum On-Time Section
Maximum On-Time Programming 1 T
A
=25°C, V
ZCD
=1V
Maximum On-Time Programming 2
T
A
=25°C,
I
ZCD
=0.469mA
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
=0V~1V
dV/dt=1V/100ns,
from 0V to 5V
-1.0
0.8
-0.1
350
0.9
1.0
500
V
µA
ns
Continued on the following page…
© 2010 Fairchild Semiconductor Corporation
FAN7930C • Rev. 1.0.0
www.fairchildsemi.com
5
Embedded System
京公网安备 11010802033920号
EEWORLD
