FAN7548 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN7548

Dual LCD Back Light Inverter Drive IC

Fairchild Semiconductor 

FAN7548

Internal Block Diagram

ENA

Vcc

+

-

5.2V

3Vref

Internal

Bias

Vz

UVLO

OUT1

Vz

2uA

OLP1

3.7V

2.5V

COMP1

13.5V

Output

Drive1

Output

Drive2

13.5V

R

SQ

R

QS

V3

Va

ADIM

Vb

BDIM

GND

OUT2

COMP6

Vz

2uA

3.7V

OLP2

2.5V

VFB1

COMP1

OSC1

SOLR1

SBurst1

Css

Va

2.5V

Error Amp.1

Buffer

COMP4

COMP2

Ramp

Sync.

Css

COMP9

Buffer

Error Amp.2

-

+

+

+

SBurst2

SOLR2

Css

Va

2.5V

Ramp

Sync.

COMP7

1.5V

OLR1

BCT

Max. 1.75V

Min. 0.25V

(Max.+Min.) of BCt

COMP3

To SOLR1

6V

+ COMP5

Vb

-

- COMP10

+-

+

Max. 1.75V

Min. 0.25V

To SBurst1

To SBurst2

SOLR2

COMP8

6V

Vcc

10uA

Css

6.5V

1.5V

VFB2

COMP2

OSC2

OLR2

CSS

2

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