FAN7930B Fairchild Semiconductor, FAN7930B Datasheet - Page 18

• Manufacturer Part Number: FAN7930B
• Description: The FAN7930B is an active power factor correction (PFC) controller for boost PFC applications that operate in critical conduction mode (CRM)
• Manufacturer: Fairchild Semiconductor

© 2010 Fairchild Semiconductor Corporation
FAN7930B • Rev. 1.0.2
Typical Application Circuit
Features
Key Design Notes
1. Schematic
LCD TV Power Supply
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) as high
as possible. However, too-high resistance makes the node easily affected by noise. Thus 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 enough. Thought D106,
system operation is normal due to the controller’s highly reliable protection features.
Application
CC
supply is not available, V
FAN7930B
Device
Figure 44.
CC
Input Voltage
power can be supplied through Zero Current Detect (ZCD)
90-265V
Demonstration Circuit
Range
18
AC
Rated Output
Power
195W
Output Voltage
(Maximum
390V (0.5A)
Current)
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