FAN7930CM Ver la hoja de datos (PDF) - Fairchild Semiconductor

Número de pieza

componentes Descripción

Fabricante

FAN7930CM

Critical Conduction Mode PFC Controller

Fairchild Semiconductor 

Typical Application Circuit

Application

LCD TV Power Supply

Device

FAN7930C

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) 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.

ƒ Quick-charge diode D106 can be eliminated. Without D106, system operation is normal due to the controller’s

highly reliable protection features.

1. Schematic

BD101,

600V,15A

C102,

680nF

C114 C115

,2.2n ,2.2n

F

F

R101,1M-

J

C101,

220nF

ZNR101

,10D471

Optional

D106

600V 3A

230mH,

49:6

LP101,EER3124N

R103,

10k,1W

VAUX

C104,

12nF

D102,

UF4004

FAN7930C

8 VCC Out 7

5 ZC

3

D

Com

CS 4

2

p

RD

INV 1

Y GND

6

R109

47

R108 D103,1N414

4.7

8

D105

600V 8A

Q101

FCPF

20N60

DC OUTPUT

VCC for another power stage

Circuit for VCC. If external VCC is used, this circuit is not needed.

Circuit for VCC for another power stage thus components structure and values may vary.

© 2010 Fairchild Semiconductor Corporation

FAN7930C • Rev. 1.0.0

Figure 45. Demonstration Circuit

18

www.fairchildsemi.com

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