© 2

FAN

7314 — LC

D B

acklight Inverter Drive IC

October 2007

FAN

FAN7314LCD Backlight Inverter Drive ICFeatures

High-Efficiency Single-Stage Power ConversionWide Input Voltage Range: 5V to 25.5VBack Light Lamp Ballast and Soft DimmingReduces Number of Required External ComponentsPrecision Voltage Reference Trimmed to 2%ZVS Half-Bridge TopologySoft StartPWM Control at Fixed FrequencyAnalog and Burst Dimming FunctionProgrammable Striking FrequencyOpen-Lamp Protection Open-Lamp Regulation20-Pin SOIC

DescriptionThe FAN7314 provides all the control functions for aseries parallel resonant converter as well as a pulsewidth modulation (PWM) controller to develop a supplyvoltage. Typical operating frequency range is between30kHz and 250kHz, depending on the CCFL and thetransformer's characteristics.

Ordering Information

All packages are lead free per JEDEC J-SDD-020B standard.

20-SOIC

Part Number Package Operating Temperature Range Packing MethodFAN7314M 20-SOIC

-25°C ~ 85°CRail

FAN7314MX 20-SOIC Tape & Reel

006 Fairchild Semiconductor Corporation www.fairchildsemi.com7314 Rev. 1.0.4

FAN

7314 — LC

D B

acklight Inverter Drive IC

© 2FAN

Typical Application Circuit

1. Schematic

2. Transformer Schematic DiagramSupported by Namyang electronics (http://www.namyangelec.co.kr)

3. Core & BobbinCore: EFD2124Material: PL7Bobbin: EFE2124

Application Lamps Input Voltage19 inch LCD Monitor 4 13V

0

OLP1

R171kΩ

D3BAV70

R161kΩ

0

0

C1115pF

0 C3010nF

0 0

C2 1μF

TX1

0

0

C2110nF

R6 82kΩ

C810μF

C251μF

0

0

0

0

C2810nF

D9BAV99

D7BAV99

D6BAV99

0

0R99.1kΩ

0

HOT1

COLD2

CN1CCFL

HOT1

COLD2

CN2CCFL

HOT1

COLD2

CN4CCFL

HOT1

COLD2

CN3CCFL

C22220μF25V

OLR

C26 0.1μF0

J10Ω

RT

OLP

D10BAW56

REF

R14100kΩ

OUTB

D1BAW56

RT

FB

R1330kΩ

LTM190EX

SN

GN

SP

GP DP

DP

DN

DN

M2

FDS8958A

C6 1μF

0

OLP2OLP1

OLP3 OLP4

R121kΩ

R111kΩ

R261kΩ

REF

R131kΩ

0 0

0 0

R15

10kΩ

C91μF

0

F1

FUSE

C710μF

12345678910

CN5

12505WR-10

R2410kΩ

R2710kΩ

R2510kΩ

OUTA

C1015pF

C1410nF

C1215pF

C2910nF

IC1 FAN7314

S_S

GND

REF

OLR

ENA

BDIM

OLP

VIN

OUTA

PGND

OUTB

RT1

CT

OUTC

ADIM

EA_IN

EA_OUT

OUTD

RT

BCT

R2210kΩ

R2310kΩ

C192.2nF

C202.2nF

00

0

0

R2110kΩ

R2010kΩ

C182.2nF

C172.2nF

0

0

R7 0Ω

R8

100kΩ

Q1KST2222

0

C1510nF

C271μF

0

0

R181kΩ

0

SN

GN

SP

GP DP

DP

DN

DN

M1

FDS8958A

0

TX2

FB

0

C1315pF

0

OLP3 OLP4

D11BAW56

0

R191kΩ

0

OLR

ON/OFF

13V

DIM(0~3.3V)

0

C4 4.7nF

C5 220pF

R5 27kΩ

0

R256kΩ

R318kΩ

R422kΩ

0

0

C34.7nF

D4BAV70

C1 0.22μF

D8BAV99

0

OLP2

0

OLR

FB

FAN7314 Rev. 02

FAN7314 Rev. 02

006 Fairchild Semiconductor Corporation www.fairchildsemi.com7314 Rev. 1.0.4 10

FAN

7314 — LC

D B

acklight Inverter Drive IC

© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.comFAN7314 Rev. 1.0.4 14