Datasheet

LT3755/LT3755-1/LT3755-2
20
37551fd
Typical applicaTions
Buck Mode 1.4A LED Driver
V
IN
LT3755-2
L1
33µH
GND
200k
200k
V
C
INTV
CC
SHDN/UVLO
FB
V
REF
ISP
1M
C1
1µF
0.1µF
V
IN
15V TO
40V
0.001µF
0.068Ω
V
IN
L1: COILTRONICS DR125-330
M1: VISHAY SILICONIX SI7850DP
D1: ON SEMICONDUCTOR MBRS360
M2: ZETEX ZXMN4A06G
M3: ZETEX ZXM62P03E6
Q1: ZETEX FMMT558
107k
28.7k
375kHz
C2
4.7µF
CTRL
0.033Ω
1.5k
1k
110k
M1
Q1
M3
20k
47k
M2
D1
C3
4.7µF
37551 TA03a
OPENLED
PWM
SS
RT
ISN
PWMOUT
SENSE
GATE
1.4A
C4
4.7µF
3 LUXEON K2
- WHITE
100k
INTV
CC
Efficiency vs V
IN
V
IN
(V)
15
80
EFFICIENCY (%)
84
88
92
96
100
20
25 30 35
37551 TA03c
40
I
L1
1A/DIV
I
LED
1A/DIV
PWM
0V TO 5V
2µs/DIV
37551 TA03b
V
IN
= 24V
V
LED
= 10V
1000:1 PWM Dimming at 120Hz
with Buck Mode