Datasheet

LT3796/LT3796-1
32
3796fa
For more information www.linear.com/3796
TYPICAL APPLICATIONS
Boost LED Driver for Twin LEDs with Detection and Protection for Faulty LED
Short One LED from String 1
Short One LED from String 2
CSOUT
1V/DIV
ISMON
1V/DIV
37961 TA10b
20ms/DIV
I
LED2
500mA/DIV
I
LED1
500mA/DIV
500mA
500mA 500mA
CSOUT
1V/DIV
1V
ISMON
1V/DIV
37961 TA10c
1ms/DIV
I
LED1
500mA/DIV
I
LED2
500mA/DIV
500mA
1.25V
625mA
M1: VISHAY SILICONIX Si7460DP
M2: VISHAY SILICONIX Si7415DN
D1: DIODES INC PDS3100
D2, D3, D4: NXP PMEG6010CEJ
Q1, Q2: ZETEX FMMT589
L1: WÜRTH 744 355 122 1
LED: CREE XLAMP XR-L
SENSEGATE GND
VMODE
FAULT
VMODE
FAULT
LT3796-1
37961 TA10a
ISMON
CSOUT
PWM
V
REF
CTRL
TGEN
FB2
SS
V
C
RT
SS
EN/UVLO
CSP
R8 10k
CSN
ISP
ISN
TG
INTV
CC
FB1
V
S
L1
22µH
D1
V
IN
8V TO 20V
C5
4.7µF
R
C
1k
V
IN
INTV
CC
R1
499k
R2
97.6k
C6
2.2µF
×4
100V
R7
22.6k
R
SNS
15mΩ
M1
M2 M3
Q1
R
LED1
500mΩ
R
LED2
500mΩ
R3
40.2k
R4
100k
R5
100k
LED STRING 1
CURRENT REPORTING
LED STRING 2
CURRENT REPORTING
INTV
CC
C1
2.2µF
×3
R6
1M
C
C
22nF
C3
0.1µF
R
T
31.6k
250kHz
D2
9 LEDs
STRING 1
9 LEDs
STRING 2
C2
0.1µF
D3
D4
R9
20k
R11
10k
SS
INTV
CC
R10
10k
Q2