LT3956 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT3956' PDF : 20 Pages View PDF
LT3956
Typical Applications
90% Efficient, 20W SEPIC LED Driver
VIN
8V TO
50V
L1A
33µH
C4
2.2µF (50V) D1
C1
4.7µF 1M
50V
1:1
250k
VIN
EN/UVLO
SW
185k
VREF
PGND
INTVCC
100k
CTRL
ISP
25k
LT3956
ISN
0.01µF
VMODE
PWM
FB
SS
RT
PWMOUT
VC
GND INTVCC
28.7k
375kHz 15k
C2
4.7µF
10nF
10V
L1B
1M
56.2k
L1: COILTRONICS DRQ127-330
D1: VISHAY PDS5100
M1: ZETEX ZXM61N03F
100
C3
96
10µF
s2
35V
92
88
0.25Ω 1A
84
20W
80
LED
0
STRING
CURRENT
DERATED
FOR VIN < 13V
M1
3956 TA05a
Efficiency vs VIN
10
20
30
40
50
VIN (V)
3956 TA05b
90W Buck Mode LED Driver, 80VIN/60VOUT
VIN
64V TO
80V
INTVCC
100k
0.1µF
1M
VIN
ISP
EN/UVLO
20k
ISN
LT3956
FB
470Ω 0.1Ω
267k 200k
1.5A
200k
Q1
VMODE
VREF
PWMOUT
Q2
24.3k
CTRL
1k
13k
PWM
SS
SW
RT
PGND
28.7k VC
GND INTVCC
375kHz
INTVCC
0.01µF
4.7µF
M1
10k
16 WHITE
LEDs, 90W
L1
33µH
D1
VIN
C1
2.2µF
s 4
D1: VISHAY 10MQ100N
L1: WÜRTH ELEKTRONIK 744066330
M1: VISHAY SILICONIX Si7113DN
Q1: ZETEX FMMT593
Q2: ZETEX FMMT493
C1, C2: MURATA GRM42-2x7R225
3956 TA06a
C2
2.2µF
s 3
18
Efficiency vs VIN
100
98
96
94
92
90
64
68
72
76
80
VIN (V)
3956 TA05b
3956f
Share Link: 
