Datasheet

LT3755/LT3755-1/LT3755-2
21
37551fd
Typical applicaTions
Buck Mode 500mA LED Driver for 20kHz PWM Dimming
V
IN
LT3755-2
L1
3.3µH
GNDV
C
FB
SHDN/UVLO
V
REF
ISP
1M
1M6V
0.1µF
V
IN
22V TO
36V
470pF
2200pF
0.2Ω
L1: TOKO 962BS_3R3M
M1: VISHAY SILICONIX SI7850DP
M2: VISHAY SILICONIX SI2306DS
D1: DIODES, INC SBM540
68.1k
CTRL
0.033Ω
M1
M2
22k
D1
37551 TA03a
INTV
CC
PWM
SS
ISN
PWMOUT
SENSE
RT
GATE
500mA
16V
2.2µF 2s
50V
4.7µF 2s
25V
0.22µF
OPENLED
13k
800kHz
4.7µF
Efficiency vs V
IN
PWM
I
LED
500mA/DIV
GATE
INDUCTOR
CURRENT
1A/DIV
500ns/DIV
37551 TA06b
Minimum PWM Pulse Switching Waveform
37551 TA06c
EFFICIENCY (%)
V
IN
(V)
15 25 3020 35 40
80
92
88
84
100
96
V
LED
= 16V
I
LED
= 0.5A