Datasheet

LT3756/LT3756-1/LT3756-2
20
375612fb
Typical applicaTions
Buck-Boost Mode LED Driver
V
IN
LT3756-2
L1
68µH
GNDV
C
INTV
CC
SHDN/UVLO FB
V
REF
ISP
1M
0.1µF
V
IN
9V TO
65V
V
IN
V
IN
V
OUT
L1: COILCRAFT MSS1038-683
D1: ON SEMICONDUCTOR MBRS3100T3
M1: VISHAY SILICONIX Si2328DS
M2: ZETEX ZXM6IP03F
Q1: ZETEX FMMT493
185k
35.7k
300kHz
39k
4700pF
C2
2.2µF
10V
CTRL
1.5k
1k
1M
Q1
M2
13k
1Ω
M1
0.068Ω
D1
C3
4.7µF
375612 TA03a
OPENLED
PWM
SS
RT
ISN
GATE
SENSE
PWMOUT
C1
4.7µF
1µF
100V
24V TO 32V
LED STRING
100mA
100k
INTV
CC
Efficiency vs V
IN
90% Efficient, 20W SEPIC LED Driver
Efficiency vs V
IN
V
IN
LT3756-2
L1A
33µH
1:1
GNDV
C
INTV
CC
SHDN/UVLO FB
V
REF
ISP
100k
INTV
CC
1M
C1
4.7µF
100V
0.001µF
0.01µF
L1: COILCRAFT MSD1278T-333
M1: VISHAY SILICONIX Si7430DP
D1: ON SEMICONDUCTOR MBRS3200T
M2: ZETEX ZXM61N03F
V
IN
8V TO
80V
185k
25k
L1B
30k
28.7k
400kHz
C2
4.7µF
10V
CTRL
0.033Ω
0.1Ω
511k
M2
M1
1A
D1
C4
1µF
C3
10µF
s2
35V
20W
LED
STRING
375612 TA04a
OPENLED
PWM
SS
RT
ISN
GATE
SENSE
PWMOUT
V
IN
(V)
0
50
EFFICIENCY (%)
60
70
80
90
100
20
40 60
375612 TA03b
80
V
IN
(V)
0
80
EFFICIENCY (%)
84
88
92
96
100
20
40 60
375612 TA04b
80