LX1744

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 13

Dual Output Boost – LED Driver / LCD Bias

I N T E GR A T ED

PRODUCT S

Copyright

© 2000

Rev. 1.1b, 2005-03-01

EVALUATI ON BOA RD

L1

47.0uH

+

C1

4.7uF

6.3V

C3

1000pF

R1

1M

R2

72K

J3

1

2

CR1

UPS5819

+

C6

spare

C8

1uF

CR3

UPS5819

+

C5

spare

CR4

C9

1uF

-VLCD

1

R11

10K

R12

10K

VIN

C10

.1uF

Q1

FDV303N

J3

R9

100K

+

C11

2.2uF

16V

LED1

LED2

LED3

LED4

C12

.1uF

R5

15

BRT

1

R8

R10

100K

R7

test

points

test

points

+

C2

4.7uF

35V

Vin

1

GND

1

/SHDN

1

ADJ

1

VOUT

1

/LSHDN

1

GND2

1

L2

47.0uH

CR2

UPS5819

R3

1M

R6

72K

C4

1000pF

+

C7

4.7uF

35V

U1 LX1744TSSOP

FB

3

DRV

12

ADJ

4

IN

6

SRC

13

OVP

10

REF

5

SW

1

LFB

9

BRT

8

/SHDN

2

/LSHDN

7

CS

11

VLCD

1

R4

1K

LFB

1

DRV

1

Figure 10 –

LX1744EVAL Evaluation Board Schematic