LX1994

Microsemi

Integrated Products Division

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

Page 4

High Efficiency LED Driver

Copyright

© 2003

Rev. 1.0a, 2004-08-10

TM

®

SIMPLIFIED BLOCK DIAGRAM

FB

S/P

10u A

SW ITC H

LO G IC

BU R S T

I PE AK

DRIVE

DR V

SRC

GND

0.2

CSM

200 m V

HYS T

CSM

16 B IT S H IFT

R E G ISTER

CLEA R

CLO C K

OUT

J/K

LA TC H

J

K

Q

CSM

I PEA K

100 m V

I PE AK

VIN

RE F

OV P

SLEE P

MO D E

CO N TR O L

1.2V

x10

0.6V

PW M &

SHU TDO W N

DETECTIO N

BR T

LS

CMP

10 0K

30k

3m V

Figure 1 – Simplified Block Diagram