LX1745

Microsemi

Integrated Products Division

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

Page 5

Triple Output Boost – LED Driver / LCD Bias

Copyright

© 2000

Rev. 1.2, 2006-02-27

TM

®

SIMPLIFIED BLOCK DIAGRAM

Control

Logic

Reference

Logic

BRT

LFB

Shutdown

Logic

LSHDN

CS

Driver

GND

DRV

IN

SRC

2.5M

Ω

50pF

SHDNx

Control

Logic

Reference

Logic

ADJx

FBx

Driver

SWx

2.5M

Ω

50pF

OVP

REF

Current

Limit

Control

Logic

Reference

Logic

ADJx

Driver

SWx

Current

Limit

Current

Limit

FBx

Voltage

Reference

50pF

2.5M

Ω

4

μA

Figure 1 –

Simplified Block Diagram