Datasheet

LT3796/LT3796-1
25
3796fa
For more information www.linear.com/3796
TYPICAL APPLICATIONS
Boost LED Driver with Output Short Circuit Protection and LED Current Monitor
Fault (Short LED) Protection without R11: Hiccup Mode Fault (Short LED) Protection with R11: Latchoff Mode
I
M2
1A/DIV
FAULT
10V/DIV
37961 TA02b
50ms/DIV
SS
2V/DIV
LED
+
50V/DIV
I
M2
1A/DIV
FAULT
10V/DIV
37961 TA02c
50ms/DIV
LED
+
50V/DIV
SS
2V/DIV
R2
118k
CSPV
S
V
IN
CSN
SS
V
REF
R5
2k
85V LED
LT3796
37961 TA02a
CTRL
CSOUT
PWM
SYNC
PWM
SYNC
M1: INFINEON BCS160N10NS3-G
M2: VISHAY SILICONIX Si7113DN
L1: COILTRONICS DR127-220
D1: DIODES INC PDS5100
D2: VISHAY ES1C
Q1: ZETEX FMMT589
LED: CREE XLAMP XR-E
ISMON
EN/UVLO
GND
FB1
ISP
ISN
TG
GATE
SENSE
L1 22µH
R
SNS1
50mΩ
I
IN
9V TO 60V
100V (TRANSIENT)
D1
R
C
10k
R
T
31.6k
250kHz
C
C
10nF
R3
499k
R4
97.6k
R1
1M
C1
2.2µF
×3
V
IN
C2
2.2µF
×4
100V
R8
13.7k
R
SNS
15mΩ
R
LED
620mΩ
M2
Q1
M1
D2
UP TO
400mA
R6
40.2k
C3
10nF
CSOUT
OPTIONAL INPUT
CURRENT REPORTING
R7
1M
VMODE
FAULT
VMODE
FAULT
LED CURRENT REPORTING
R11 OPTIONAL
FOR FAULT LATCHOFF
R11 402k (OPT)
V
C
RT
FB2
INTV
CC
C5
4.7µF
C6
0.1µF
INTV
CC
R10
100k
R9
100k
INTV
CC
C4
0.1µF