Datasheet

LT3519/LT3519-1/LT3519-2
15
3519fa
TYPICAL APPLICATIONS
Buck Mode 500mA LED Driver
2000:1 PWM Dimming at 120Hz Effi ciency vs V
IN
SW
ANODE
FB
V
IN
V
REF
CTRL
SHDN/UVLO
ISPSHDN
ISN
OPENLED
LT3519
GND
1M
191k
100k
1M
V
IN
12V TO 30V
(UP TO 40V TRANSIENT)
R
SENSE
0.5Ω
M1
V
OUT
C2
10μF
C1
4.7μF
9V LED
500mA
CATHODE
PWM
PWM
3519 TA04a
1k
14.7k
10k
1.5k 130k
Q2
L1
47μH
Q1
C1: MURATA GRM32ER71H475KA88
C2: TDK C3216X7R1C106M
Q1: DIODES FMMT555 PNP
Q2: DIODES FMMT494 NPN
L1: COILTRONICS DR73-470-R
M1: VISHAY SILICONIX Si2337DS
5V
V
IN
(V)
12
80
EFFICIENCY (%)
82
84
86
88
90
15 18 2421 27
3519 TA04c
30
PWM
5V/DIV
I
LED
0.5A/DIV
I
L
0.3A/DIV
1μs/DIV
3519 TA04b
V
IN
= 20V