Datasheet

LT3519/LT3519-1/LT3519-2
17
3519fa
TYPICAL APPLICATIONS
Minimum BOM Buck Mode 500mA LED Driver
Waveforms for Open LED Effi ciency vs V
IN
V
IN
– V
OUT
5V/DIV
OPENLED
10V/DIV
I
LED
0.5A/DIV
25μs/DIV
3519 TA06b
V
IN
= 15V
V
IN
(V)
10
70
EFFICIENCY (%)
74
72
76
78
80
82
84
13 1916 22
3519 TA06c
25
SW
ANODE
FB
V
IN
V
REF
CTRL
PWM
SHDN/UVLO
ISP
ISN
OPENLED
LT3519-2
GND
140k
100k
1M
V
IN
10V TO 25V
0.5Ω
V
OUT
C2
1μF
C1
2.2μF
6V LED
500mA
CATHODE
3519 TA06a
23.2k
10k
130k
L1
6.8μH
Q1
C1: TDK C3216X7R1E225K
C2: TDK C1608X7R1C105K
Q1: DIODES FMMT555 PNP
L1: COILTRONICS DR73-068-R