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?2010 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
FAN7930B " Rev. 1.0.3
18
Typical Application Circuit
Application
Device
Input Voltage
Range
Rated Output
Power
Output Voltage
(Maximum Current)
LCD TV Power Supply
FAN7930B
90-265 V
AC
 
195 W
390 V (0.5 A)
 
Features
?   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. 
 
Key Design Notes
?   When auxiliary V
CC
 supply is not available, V
CC
 power can be supplied through Zero Current Detect (ZCD)
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 if output diode inrush current capability is sufficient. Even without 
D106, system operation is normal due to the controllers highly reliable protection features.
 
Schematic
Z N R 1 0 1 ,
1 0 D 4 7 1
1 9 4 m H , 3 9 :5
D 1 0 5
6 0 0 V 8 A
V
AU X
DC O U T P U T
Q 1 0 1
F C P F
2 0 N 6 0
D 1 0 6
6 0 0 V 3 A
R 1 0 1 ,1 M -J
C 1 0 1 ,
2 2 0 n F
C 1 1 4 ,
2 .2 n F
C 1 0 2 ,
6 8 0 n F
B D 1 0 1 ,
6 0 0 V ,1 5 A
R 1 0 9
4 7
R 1 0 8
4 .7
D 1 0 3 ,1 N 4 1 4 8
L P 1 0 1 ,E E R 3 0 1 9 N
1
7
6
8
5
2
FA N 7930B
Co m p
IN V
V CC
O u t
G N D
Z C D
C S
O V P
4
3
C 1 1 5 ,
2 .2 n F
R 1 0 3 ,
1 0 k ,1 W
D 1 0 2 ,
U F 4 0 0 4
C 1 0 4 ,
1 2 n F
C irc u it fo r V
C C
. If e x te rn a l V
C C
 is u s e d , th is c irc u it is n o t n e e d e d .
O p tio n a l
 
Figure 44.    Demonstration Circuit
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