FAN7930B 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN7930B

Critical Conduction Mode PFC Controller

Fairchild Semiconductor 

Typical Application Circuit

Application

LCD TV Power Supply

Device

FAN7930B

Input Voltage

Range

90-265VAC

Rated Output

Power

195W

Output Voltage

(Maximum

Current)

390V (0.5A)

Features

ƒ Average efficiency of 25%, 50%, 75%, and 100% load conditions is higher than 95% at universal input.

ƒ Power factor at rated load is higher than 0.98 at universal input.

ƒ Total Harmonic Distortion (THD) at rated load is lower than 15% at universal input.

Key Design Notes

ƒ When auxiliary VCC supply is not available, VCC power can be supplied through Zero Current Detect (ZCD)

winding. The power consumption of R103 is quite high, so its power rating needs checking.

ƒ 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.

ƒ 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.

1. Schematic

© 2010 Fairchild Semiconductor Corporation

FAN7930B • Rev. 1.0.2

Figure 44. Demonstration Circuit

18

www.fairchildsemi.com

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