Datasheet

LT3519/LT3519-1/LT3519-2
16
3519fa
TYPICAL APPLICATIONS
Boost 150mA LED Driver
3000:1 PWM Dimming at 120Hz Effi ciency vs V
IN
I
LED
0.15A/DIV
I
L
0.5A/DIV
PWM
5V/DIV
0.5μs/DIV
3519 TA05b
V
IN
= 12V
V
IN
(V)
6
82
EFFICIENCY (%)
84
86
88
90
92
94
108121614 18
3519 TA05c
20
SW
L1
15μH
V
REF
CTRL
SHDN/UVLO
ISP
ISN
FB
OPENLED
LT3519-1
GND
1M
243k
137k
100k
1M
V
IN
6V TO 20V
R
SENSE
1.65Ω
V
OUT
M1
C2
2.2μF
C1
1μF
24V LED
150mA
•
•
•
ANODE
PWM
PWM
3519 TA05a
40k
1M
C1: TDK C3216X7R1H105K
C2: MURATA GRM31CR71H225KA88
L1: COILTRONICS DR74-150-R
M1: VISHAY SILICONIX Si2318DS
R
SENSE
: STACKPOLE ELECTRONICS RHC 2512 2.49 AND 4.99
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
= 31.7V OVERVOLTAGE PROTECTION
5V
CATHODE
V
IN