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LT3598
TYPICAL APPLICATIONS
Auto Battery Powered Driver for 20 LEDs with 90mA Each String
PV IN
6V TO 40V
L1
4.7μH
D1
C1
2.2μF
V IN
5V
C3
2.2μF
100k
SHDN
CTRL
V IN
OPENLED
SHDN
CTRL
SW
V OUT
V O_SW
FB
R4
1.00M
R5
C2
4.7μF
PWM
PWM
SYNC
RT
LT3598
30.9k
R1
51.1k
V REF
R10
R8
60.4k
20k
CTRL
LED1
LED2
LED3
LED4
LED5
90mA
LED6
T SET I SET
SS
GND V C
R7
100k
C5
56pF
R3
9.76k
C4
0.1μF
R C
5.11k
C C
6.8nF
3598 TA04a
C1: NIPPON CHEMI-CON KTS500B225M32NOTOO
C2: MURATA GRM32ER71H475KA88L
C3: TAIYO YUDEN LMK212BJ225MG
D1: VISHAY SS3H9
L1: WüRTH ELEKTRONIK 7447785004
Dimming Range 1000:1 PWM,
Ef?ciency
10ms Period (125°C Junction Temperature)
95
90
PWM
85
5V/DIV
80
I LED1
75
70
100mA/DIV
65
60
5μs/DIV
3598 TA04c
0
20
40
60
80 100 120 140 160 180
TOTAL LED CURRENT (mA)
3598 TA04b
3598fb
18
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