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FAN7930B Datasheet(PDF) 18 Page - ON Semiconductor

Part # FAN7930B
Description  Critical Conduction Mode PFC Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

FAN7930B Datasheet(HTML) 18 Page - ON Semiconductor

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18
Typical Application Circuit
Application
Device
Input Voltage
Range
Rated Output
Power
Output Voltage
(Maximum Current)
LCD TV Pow er Supply
FAN7930B
90-265 VAC
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.
Pow er factor at rated load is higher than 0.98 at universal input.
Total Harmonic Distortion (THD) at rated load is low er than 15% at universal input.
Key Design Notes
When auxiliary V
CC supply is not available, V CC pow er can be supplied through Zero Current Detect (ZCD)
w inding. The pow er consumption of R103 is quite high, so its pow er 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. How ever, too-high resistance makes the node susceptible to noise. Resistor values need
to strike a balance betw een pow er consumption and noise immunity.
Quick charge diode (D106) can be eliminated if output diode inrush current capability is sufficient. Even w ithout
D106, system operation is normal due to the controller’s highly reliable protection features.
Schematic
ZNR101,
10D471
194H, 39:5
D105
600V 8A
VAUX
DC OUTPUT
Q101
FCPF
20N60
D106
600V 3A
R101,1M-J
C101,
220nF
C114,
2.2nF
C102,
680nF
BD101,
600V,15A
R109
47
R108
4.7
D103,1N4148
LP101,EER3019N
1
7
6
8
5
2
FAN7930B
Comp
INV
VCC
Out
GND
ZCD
CS
OVP
4
3
C115,
2.2nF
R103,
10k,1W
D102,
UF4004
C104,
12nF
Circuit for VCC. If external VCC is used, this circuit is not needed.
Optional
Figure 44.
Dem onstration Circuit


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