FAN7930C Fairchild Semiconductor, FAN7930C Datasheet - Page 18
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FAN7930C
Manufacturer Part Number
FAN7930C
Description
The FAN7930C is an active power factor correction (PFC) controller for boost PFC applications that operate in critical conduction mode (CRM)
Manufacturer
Fairchild Semiconductor
Datasheet
1.FAN7930C.pdf
(22 pages)
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© 2010 Fairchild Semiconductor Corporation
FAN7930C • Rev. 1.0.1
Typical Application Circuit
Features
Key Design Notes
1. Schematic
LCD TV Power Supply
600V,15A
BD101,
Average efficiency of 25%, 50%, 75%, and 100% load conditions is higher than 95% at universal input.
Power factor at rated load is higher than 0.98 at universal input.
Total Harmonic Distortion (THD) at rated load is lower than 15% at universal input.
When auxiliary V
winding. The power consumption of R103 is quite high, so its power rating needs checking.
Because the input bias current of INV pin is almost zero, output voltage sensing resistors (R112~R115) should
be as high as possible. However, too-high resistance makes the node susceptible to noise. Resistor values need
to strike a balance between power consumption and noise immunity.
Quick-charge diode D106 can be eliminated. Without D106, system operation is normal due to the controller’s
highly reliable protection features.
Application
C114
,2.2n
R101,1M-
F
680nF
C102,
J
C115
,2.2n
F
220nF
C101,
ZNR101
,10D471
CC
supply is not available, V
Circuit for V
Circuit for V
FAN7930C
Device
CC
CC
. If external V
for another power stage thus components structure and values may vary.
Figure 45.
V
CC
for another power stage
CC
is used, this circuit is not needed.
CC
Input Voltage
power can be supplied through Zero Current Detect (ZCD)
90-265V
UF4004
Demonstration Circuit
10k,1W
C104,
D102,
Optional
12nF
600V 3A
R103,
Range
8
5
3
2
D106
V
ZC
D
Com
p
RD
Y
FAN7930C
CC
18
GND
6
Out
INV
AC
CS
230mH,
49:6
V
7
4
1
AUX
R108
LP101,EER3124N
4.7
R109
47
Rated Output
D103,1N414
Power
8
195W
20N60
FCPF
Q101
600V 8A
D105
Output Voltage
(Maximum
390V (0.5A)
Current)
DC OUTPUT
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