LT1768I データシートの表示（PDF） - Linear Technology

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LT1768I

High Power CCFL Controller for Wide Dimming Range and Maximum Lamp Lifetime

Linear Technology 

LT1768

TYPICAL APPLICATION

VIN = 9V TO 24V

C1

33µF

C2

0.047µF

PROG

0V TO 5V OR

1kHz PWM

C3

0.22µF

R1

49.9k

4 Watt Single Lamp CCFL Supply

C9

33pF

X1

LAMP

T1

1

PGND

16

GATE

2

DI02

15

VIN

3

DI01

14

VREF

4

13

SENSE FAULT

FAULT

5

LT1768

12

VC

SHDN

SHUTDOWN

6

AGND

7

CT

RMIN

RMAX

11

R4

10 31.6k

8

PROG

9

PWM

5V

C5

0.1µF

R5

124k

R2

39.2k

CTX110607

C7

0.33µF

R7

499Ω

Q1A

ZDT1048

Q1B

ZDT1048

D2

MBRS130LT3

L1

33µH

Q2

Si3456DV

C4

10µF

C6

1µF

R3

61.9k

C8

R2

1000pF 100Ω

R6

0.05Ω

1768 TA09

RELATED PARTS

PART NUMBER

LT1170

LT1182/LT1183

DESCRIPTION

Current Mode Switching Regulator

CCFL/LCD Contrast Switching Regulators

LT1184

LT1186

LT1372

LT1373

LT1786F

CCFL Current Mode Switching Regulator

CCFL Current Mode Switching Regulator

500kHz, 1.5A Switching Regulator

250kHz, 1.5A Switching Regulator

SMBus Controlled CCFL Switching Regulator

COMMENTS

5.0A, 100kHz

3V ≤ VIN ≤ 30V, CCFL Switch: 1.25A, LCD Switch: 625mA,

Open Lamp Protection, Positive or Negative Contrast

1.25A, 200kHz

1.25A, 100kHz, SMBus Interface

Small 4.7µH Inductor, Only 0.5 Square Inch of PCB

1mA IQ at 250kHz, Regulates Positive or Negative Outputs

Precision 100µA Full Scale Current DAC

20 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com

sn1768 1768fs LT/TP 0901 2K • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 2000

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