Datasheet

LT3761
25
3761f
V
IN
(V)
0
EFFICIENCY (%)
10
20 30
37551 TA05b
40
80
84
88
92
100
96
0.6
OUTPUT CURRENT (A)
0.9
1.2
1.5
1.8
2.1
OUTPUT CURRENT
EFFICIENCY
Typical applicaTions
40W SEPIC LED Driver
SEPIC Efficiency,
Output Current vs V
IN
V
IN
LT3761
RTV
C
INTV
CC
EN/UVLO
FB
V
REF
SENSE
1M
100k
INTV
CC
INTV
CC
499k
C1
2.2µF
×2
50V
4.7nF
10nF
C3
10µF
×5
35V
C2
2.2µF
×2
50V
V
IN
8V TO
40V
90.9k
10k
28.7k
350kHz
1µF
133k
CTRL
8mΩ
13
2
4
1M
M1
M2
D1
49.9k
40W
LED
STRING
3761 TA05a
OPENLED
PWM
DIM/SS
GND
ISP
ISN
GATE
PWMOUT
0.15Ω
1.67A
M1: INFINEON BSC123NO8
D1: DIODES INC PDS5100
L1: COILCRAFT MSD1278-103
M2: VISHAY SILICONIX Si2306BDS
LED: CREE XLAMP XM-L (×7)
C1, C2: KEMET C1210C225K5
C3: TAIYO YUDEN UMK325BJ106M
L1
10µH
1:1
•
•
PWM Dimming Waveform
I
LED
0.5A/DIV
100µs/DIV
PWM
3761 TA05c