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LT3599
TYPICAL APPLICATIONS
12W LED Driver
1MHz Boost, 80mA per String, 10 LEDs per String
PV IN
8V TO 24V
R1
200k
C1
3.3μF
25V
V IN
R4
100k
V IN
R5
100k
V IN
3.1V TO 5.5V
C3
1μF
6.3V
L1
10μH
V IN
SHORTLED
OPENLED
SW
D1
V OUT
V O_SW
FB
R10
1M
C2
4.7μF
50V
2
SHDN /UVLO
R11
R2
31.6k
PWM
PWM
SYNC
CTRL
LT3599
31.6k
D5
R3
RT
D4
33.2k
R6
53.6k
R7
53.6k
R8
V REF
T SET
LED1
D2
D3
80.6k
DISABLE4
LED2
LED3
LED4
80mA PER STRING
C1: MURATA GRM21BR71E335K
C2: MURATA GRM31CR71H475K
D1: DIODES INC. DFLS240
D2, D3, D4, D5: DIODES INC. 1N4148WS
(SEE SHORTLED FLAG IN APPLICATIONS
INFORMATION SECTION)
L1: VISHAY IHLP2020BZER100M01
I SET
R9
16.5k
SS
GND V C
C4
47nF
R C
10k
C C
2.2nF
100pF
3599 TA02a
100
Ef?ciency
PWM Dimming Range 1000:1
(10ms Period)
95
90
85
80
75
70
PV IN = 24V
PV IN = 12V
PWM
5V/DIV
I LED
TOTAL
200mA/DIV
65
60
40
80
120
160
200
240
280
320
10μs/DIV
3599 TA02c
TOTAL LED CURRENT (mA)
3599 TA02b
3599fe
18
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