LX1994
TM
廬
High Efficiency LED Driver
P
RODUCTION
D
ATA
S
HEET
APPLICATION CIRCUITS
WWW .
Microsemi
.C
OM
33uH
V
IN
= 2.0V to 5.5V
UPS5819
LX1994
VIN
PWM dimming
S/P
BRT
CMP
0.1uF
LS
GND
FB
0.1uF
SRC
OVP
DRV
FDV303
1M
51k
15
Figure 4
鈥?LED Driver with PWM Dimming applied to S/P Input
33uH
V
IN
= 2.0V to 5.5V
UPS5819
LX1994
VIN
ON
OFF
DIMMING
BRT
FB
LS
CMP
GND
S/P
DRV
SRC
OVP
FDV303
1M
51k
0.1uF
15
Figure 5
鈥?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.
A
PPLICATIONS
A
PPLICATIONS
Copyright
漏
2003
Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9