Datasheet

LT3519/LT3519-1/LT3519-2
13
3519fa
4W Boost Automotive LED Driver
1000:1 PWM Dimming at 120Hz Effi ciency vs V
IN
TYPICAL APPLICATIONS
SW
V
IN
V
REF
CTRL
SHDN/UVLO
ISP
ISN
FB
OPENLED
ANODE
LT3519
GND
L1
68μH
1M
V
IN
6V TO 30V
243k
137k
100k
1M
1M
29.4k
R
SENSE
2.49Ω
M1
C2
4.7μF
C1
1μF
38V LED
100mA
C1: TDK C3216X7R1H105K
C2: MURATA GRM32ER71H475KA88
L1: COILTRONICS DR74-680-R
M1: VISHAY SILICONIX Si2308DS
R
SENSE
: STACKPOLE ELECTRONICS RHC 2512 2.49
NOTE:
V
IN
= 8.2V RISING TURN ON
V
IN
= 6.2V FALLING UVLO
V
IN
> 10V FULL LED CURRENT AND FOLDBACK BELOW
V
OUT
42.7V OVERVOLTAGE PROTECTION
CATHODE
PWM
PWM
3519 TA02a
V
OUT
5V
PWM
5V/DIV
I
LED
0.1A/DIV
I
L
0.3A/DIV
2μs/DIV
3519 TA02b
V
IN
= 12V
V
IN
(V)
6
84
EFFICIENCY (%)
86
88
90
92
94
10
14 18 22
3519 TA02c
26 30