LT3743FE(RevB) 데이터 시트보기 (PDF) - Linear Technology

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LT3743FE
(Rev.:RevB)

High Current Synchronous Step-Down LED Driver with Three-State Control

Linear Technology 

LT3743

BLOCK DIAGRAM (QFN Package)

VIN

402k

133k

2.2nF

EN/UVLO

2

VREF

3

SYNC

82.5k

SYNC

16

RT

15

2V REFERENCE

OSCILLATOR

1.5V

CTRL_H

6

CTRL_L

7

100nF

34k

8.2nF

SS

8

CTRL_T

4

VCL

13

VCH

14

34k

8.2nF

+

+

+

–

CTRL BUFFER

5.5μA

CTRL_SEL

17

PWM

18

VIN

28

INTERNAL

REGUALTOR

AND

UVLO

VCC_INT

27

HIGH SIDE

DRIVER

CBOOT

25

–

HG

23

RQ

+

S

PWM

COMPARATOR

SYNCRONOUS

CONTROLLER

SW

24

LG

26

LOW SIDE

DRIVER SENSE+

10Ω

11

33nF

CURRENT

MIRROR

gm AMP

gm = 475μA/V

RO = 3.5M

IOUT = 40μA

3k

SENSE–

10Ω

12

90k

1V

VOLTAGE

REGULATOR

AMP

40.2k

FB

10

10k

1.3V

OPEN-LED

COMPARATOR

2.5Ω

2.5Ω

PWMGL

22

PWMGH

19

VIN

47μF

10μF

0.1μF

2.2μH

RS

5mΩ

330μF

×3

10A LED

330μF

OUTPUT

×3

3743 F01

Figure 1. Block Diagram

3743fb

11

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