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LT3598
TYPICAL APPLICATIONS
LED Driver for 30 White LEDs with 60mA Each String
PV IN
L1
10μH
D1
6V TO 40V
C1
2.2μF
V IN
5V
C3
2.2μF
R6
100k
SHDN
CTRL
V IN
OPENLED
SHDN
CTRL
SW
V OUT
V O_SW
FB
R4
1.00M
R5
C2
4.7μF
PWM
SYNC
PWM
SYNC
RT
LT3598
30.9k
R1
51.1k
V REF
R HOT
10k
CTRL
LED1
LED2
LED3
60mA
R8
60.4k
R NTC
100k
R7
100k
T SET I SET
C5
47pF R3
9.76k
SS
LED4
LED5
LED6
GND V C
C4
0.1μF
R C
2.61k
C C
15nF
3598 TA03a
C1: TAIYO YUDEN GMK325BJ225ML
C2: MURATA GRM32ER71H475KA88L
C3: TAIYO YUDEN LMK212BJ225MG
D1: VISHAY SS3H9
L1: WüRTH ELEKTRONIK 744777410
R NTC : MURATA NCP18WF104J03RB
Dimming Range (1000:1 PWM) at 125°C
100
Ef?ciency (PWM Dimming)
Junction Temperature, 10ms Period
95
PV IN = 25V
PWM
5V/DIV
90
85
PV IN = 12V
SW
20V/DIV
80
75
70
I LED1
100mA/DIV
65
60
2μs/DIV
3598
0
20
40
60
80 100 120 140 160 180
TOTAL LED CURRENT (mA)
3598 TA03b
3598fb
17
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