LX1994

Microsemi

Integrated Products Division

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

Page 9

High Efficiency LED Driver

Copyright

© 2003

Rev. 1.0d, 2006-02-09

TM

®

APPLICATION CIRCUITS

DRV

SRC

OVP

S/P

VIN

BRT

V

GND

LX1994

FB

33uH

FDV303

UPS5819

LS

CMP

PWM dimming

0.1uF

0.1uF

15

1M

51k

Figure 4 – LED Driver with PWM Dimming applied to S/P Input

OFF

ON

DIMMING

DRV

SRC

OVP

S/P

VIN

BRT

V

GND

LX1994

FB

33uH

FDV303

UPS5819

LS

CMP

0.1uF

15

1M

51k

Figure 5 – LED Driver with DC Dimming applied to BRT Input

Note:

The component values shown are only examples for a working system. Actual values will vary greatly depending

on desired parameters, efficiency, and layout constraints.