LX1745

Microsemi

Integrated Products Division

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

Page 13

Triple Output Boost – LED Driver / LCD Bias

Copyright

© 2000

Rev. 1.2, 2006-02-27

TM

®

EVALUATION BOA RD

R4

4.02K

L1

47.0uH

+

C1

4.7uF

6.3V

C3

1000pF

R1

1M

R2

72K

R3

15

18V

VLCD1

1

22V

L2

L3

CR1

UPS5819

CR2

UPS5819

CR3

UPS5819

SHDN1

1

SHDN2

1

VLCD2

1

+

C5

4.7uF

35V

+

C6

4.7uF

35V

+

C4

spare

C7

1000pF

U1

LX1745

CS

15

ADJ1

2

SW1

1

SHDN1

3

VIN

4

SHDN2

9

OVP

17

SHDN

5

DRV

6

SRC

7

SW2

10

LEDGND

8

LFB

14

ADJ2

13

LCDGND2

11

REF

18

FB2

12

LCDGND1

20

FB1

19

C8

1000pF

JU3

1

2

R5

1M

R6

72K

R7

1.25M

R8

72K

ADJ1

1

ADJ2

1

C13

1uF

REF

1

R12

100K

C12

1uF

R13

100K

JU2

1

2

JU1

1

2

GND

1

Vin

1

CR4

UPS5819

CR5

UPS5819

C9

1uF

C10

1uF

-VLCD

1

+

C2

4.7uF

35V

VOUT

1

FDBK

1

GND

1

+

C11

Spare

Q1

FDV303N

JU4

1

2

LED 4

LED 3

LED 2

LED 1

BRT

1

SHDN

1

R11

10K

R10

10K

R9

10K

Figure 10 –

LX1745EVAL Evaluation Board Schematic

Figure 11 –

LX1745EVAL Evaluation Board