Features
Description
The FA N7930C is an active pow er factor correction
(PFC) controller for boost PFC applications that operate
in critical conduction mode ( CRM). It uses a voltagemode PWM that compares an internal ramp signal w ith
the error amplifier output to generate a MOSFET turn-off
signal. Because the voltage- mode CRM PFC controller
does not need rectified A C line voltage infor mation, it
saves the pow er loss of an input voltage-sensing netw ork
necessary for a current-mode CRM PFC controller.
PFC-Ready Signal
V IN-Absent Detection
Maximum Sw itching Frequency Limitation
Internal Soft-Start and Startup w ithout 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 w ith 3.5 V Hysteresis
Low Startup and Operating Current
Totem-Pole Output w ith High State Clamp
+500/-800 mA Peak Gate Drive Current
8-Pin, Small Outline Package (SOP)
Related Resources
AN-8035 — Design Consideration for Boundary
Conduction Mode PFC Using FAN7930
Applications
FA N7930C provides over-voltage protection (OV P),
open-feedback protection, over-current protection
(OCP), input-voltage-absent detection, and undervoltage lockout protection ( UVLO). The PFC-ready pin
can be used to trigger other pow er stages w hen PFC
output voltage reaches the proper level w ith hysteresis.
The FAN7930C can be disabled if the INV pin voltage is
low er than 0.45 V and the operating current decreases
to a very low level. Us ing a new variable on-time control
method, total har monic distortion (THD) is low er than in
conventional CRM boost PFC ICs.
Adapter
Ballast
LCD TV, CRT TV
SMPS
Ordering Information
Part Number
FAN7930CMX-G
Operating
Top Mark
Temperature Range
-40 to +125°C
© 2010 Semiconductor Components Industries, LLC.
December-2017, Rev. 3
7930C
Package
Packing
Method
8-Lead, Small Outline Package (SOP)
Tape & Reel
Publication Order Number:
FAN7930C/D
FAN7930C — Critical Conduction Mode PFC Controller
FAN7930C
Critical Conduction Mode PFC Controller
FAN7930C — Critical Conduction Mode PFC Controller
Application Diagram
DC OUTPUT
Vcc
FAN7930C
line filter
AC INPUT
8
VCC
5
ZCD
3
COMP
2
Out
RDY
7
CS
4
INV
1
GND
6
PFC
ready
Figure 1.
Typical Boost PFC Application
Internal Block Diagram
VCC
H:open
VREF
2.5VREF
VBIAS
Internal
Bias
ZCD
Clamp
Circuit
VCC
5
reset
8
VCC
7
OUT
4
CS
6
GND
VZ
+
VTH(S/S)
8.5
12
-
VCC
+
Restart
Timer
VTH(ZCD)
Gate
Driver
fMAX
limit
THD
Optimized
Sawtooth
Generator
Control Range
Compensation
S
Q
R
Q
VO(MAX)
+
-
40kW
Startup without
Overshoot
+
8pF
INV
-
1
VREF
VREF
Stair
Step
VCS_LIM
+
Clamp
Circuit
reset
VIN Absent
COMP
3
disable
disable
-
0.35
Thermal
Shutdown
0.45
2.5
2.675
+
RDY
2
INV_open
OVP
UVLO
VBIAS
2.051
Figure 2.
2.240
Functional Block Diagram
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2
VCC
OUT
GND
ZCD
FAN7930C
8-SOP
INV
Figure 3.
RDY COMP
CS
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 2.5 V.
2
RDY
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, w hich is an (open-drain)
output type.
3
COMP
This pin is the output of the transconductance error amplifier. Components for the output voltage
compensation should be connected betw een this pin and GND.
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 sw itching noise.
5
ZCD
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 low er than 1.4 V, 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 pow er ground should be separated.
7
OUT
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.
8
V CC
This is the IC supply pin. IC current and MOSFET drive current are supplied using this pin.
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3
FAN7930C — Critical Conduction Mode PFC Controller
Pin Configuration
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
Parameter
Min.
Max.
VZ
V
IOH, IOL
Peak Drive Output Current
-800
+500
mA
ICLAMP
Driver Output Clamping Diodes V O>V CC or V O
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