Datasheet

LT3796/LT3796-1
33
3796fa
For more information www.linear.com/3796
SEPIC LED Driver with 100:1 Analog Dimming
ILED vs V
CTRL_IN
TYPICAL APPLICATIONS
V
CTRL_IN
(V)
1200
37961 TA11b
0 4 6 82
400
200
0
600
800
1000
I
LED
(mA)
M1: INFINEON BSC16ON1ONS3-G
M2: VISHAY SILICONIX Si7461DP
M3: ZETEX ZXM6IN02F
L1: COILTRONICS DR Q 127-220
D1: DIODES INC PDS5100
D2: NXP PMEG6010CEJ
LED: CREE XLAMP XR-E
SENSEGATE GND
LT3796-1
37961 TA11a
ISMON
CSOUT
PWM
V
REF
V
REF
CTRL
TGEN
FAULT
VMODE
FAULT
VMODE
FB2
SS
V
C
RT
EN/UVLO
CSP
CSN
ISP
ISN
TG
INTV
CC
FB1
V
S
L1A
22µH
L1B
C3
2.2µF ×2 50V
INTV
CC
D1
R17 10k
V
IN
8V TO 20V
C8
4.7µF
R
C
1k
R11
200k
R7
100k
M3
R10
7.87k
V
IN
INTV
CC
R1
499k
R2
97.6k
D2
C7
2.2µF
×4
50V
R13
23.7k
R14 6.65k
R
SNS
15mΩ
R
LED1
270mΩ
M2
R
LED2
3.32Ω
C1
2.2µF
×3
R12
1M
M1
C
C
22nF
R
T
19.6k
400kHz
10 LEDs
R6 10k
LED CURRENT
REPORTING
C2
0.1µF
C3
0.1µF
C6
0.1µF
•
•
R15
100k
R16
100k
–
+
R8 100k
R5 1k
INTV
CC
8
3
2
4
1
R4
113k
LTC1541
OP AMP
R3
200k
V
REF
+
–
5
6
7
LTC1541
COMP
1.2V INTERNAL
REFERENCE
C4
0.1µF
R9 30.1k
C5
0.1µF
CTRL_IN