LT3518EUF View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT3518EUF' PDF : 20 Pages View PDF
TYPICAL APPLICATIONS
Buck Mode 1.5A LED Driver
PVIN
24V
VIN
3.3V C1
2.2μF
VREF
PWM
C2
2.2μF
RSENSE
68mΩ M1
ISP
VIN
SHDN
ISN TG
SW
LT3518
CTRL
FB
PWM
SS
SYNC
RT
TGEN VREF VC GND
C4
0.1μF
C1: KEMET C0805C225K4RAC
C2: MURATA GRM31MR71E225KA93
C3: MURATA GRM32DR71E106KA12B
C4, C5: MURATA GRM21BR71H104KA01B
D1: ZETEX ZLLS2000TA
L1: TOKO B992AS-150M
LEDS: LUXEON K2 (WHITE)
M1: ZETEX ZXMP6A13GTA
1.5A
RT
16.9k
1MHz
C3
10μF
L1
15μH
D1
C5
0.1μF
3518 TA02a
LT3518
1000:1 PWM Dimming at 120Hz
PWM
5V/DIV
ILED
1A/DIV
IL
1A/DIV
PVIN = 24V
fOSC = 1MHz
ILED = 1.5A
2μs/DIV
3518 TA02b
500mA, 5V to 12V Boost Converter with Accurate Input Current Limit
RSENSE L1
50m1 4.3μH
D1
VIN
5V
C2
2.2μF
SHDN
ISP TG ISN
VIN
CTRL
PWM
SHDN LT3518
TGEN
VREF
VC GND
SW
FB
SYNC
RT
SS
R3
10k
C4
10nF
C3
0.1μF
RT
6.04k
2MHz
C1: KEMET C0805C225K4RAC
C2: KEMET C1206C106K4RAC
C3: MURATA GRM21BR71H104KA01B
C4: MURATA GCM033R71A103KA03
D1: ZETEX ZLLS2000TA
L1: TOKO B992AS-4R3N
R1
549k
VOUT
12V
500mA
C2
10μF
R2
49.9k
3518 TA03a
Efficiency
90
80
70
60
50
0
100 200 300 400 500
ILOAD (mA)
3518 TA03b
3518fe
13
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