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LT3956
Typical applicaTions
90% Efficient, 20W SEPIC LED Driver
V
IN
8V TO
50V
C1
1M
250k
4.7µF
50V
185k
25k
INTV
CC
100k
28.7k
375kHz
0.01µF
L1: COILTRONICS DRQ127-330
D1: VISHAY PDS5100
M1: ZETEX ZXM61N03F
90W Buck Mode LED Driver, 80V
V
IN
64V TO
80V
1M
EN/UVLO
20k
INTV
CC
100k
VMODE
V
REF
24.3k
CTRL
13k
PWM
SS
RT
V
C
28.7k
375kHz
0.01µF
0.1µF
D1: VISHAY 10MQ100N
L1: WÜRTH ELEKTRONIK 744066330
M1: VISHAY SILICONIX Si7113DN
Q1: ZETEX FMMT593
Q2: ZETEX FMMT493
C1, C2: MURATA GRM42-2x7R225
C4
L1A
2.2µF (50V)
33µH
1:1
V
IN
EN/UVLO
SW
V
PGND
REF
CTRL
ISP
LT3956
ISN
VMODE
PWM
FB
SS
56.2k
RT
PWMOUT
V
GND
INTV
C
CC
C2
15k
4.7µF
10V
10nF
/60V
IN
V
ISP
IN
470
0.1
ISN
LT3956
FB
M1
PWMOUT
Q2
1k
SW
PGND
GND
INTV
CC
INTV
CC
4.7µF
D1
C3
10µF
L1B
2
35V
0.25
1A
1M
20W
LED
STRING
CURRENT
DERATED
FOR V
IN
M1
3956 TA05a
OUT
267k
200k
C2
2.2µF
3
1.5A
200k
Q1
10k
16 WHITE
LEDs, 90W
L1
33µH
D1
V
IN
C1
2.2µF
4
3956 TA06a
Efficiency vs V
100
96
92
88
84
80
0
10
20
30
V
(V)
IN
< 13V
Efficiency vs V
100
98
96
94
92
90
64
68
72
V
(V)
IN
IN
40
50
3956
TA05b
IN
76
80
3956
TA05b
3956f
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