Datasheet

LT3761
22
3761f
Typical applicaTions
94% Efficient Boost LED Driver for Automotive Headlamp with 25:1 PWM Dimming
Boost LED Driver with Output Short-Circuit Protection with Externally Driven PWM
Boost Efficiency and Output Current vs V
IN
V
IN
LT3761
L1
10µH
RTV
C
INTV
CC
EN/UVLO
FB
V
REF
SENSE
1M
100k
INTV
CC
INTV
CC
R1
499k
C
IN
2.2µF
×2
100V
C
C
4.7nF
C
SS
0.01µF
C
PWM
47nF
300Hz
C
OUT
2.2µF
×4
V
IN
8V TO
60V
R
DIM
124k
R2
90.9k
R
C
5.1k
R
T
28.7k
350kHz
C
VCC
1µF
140k
CTRL
R
SENSE
10mΩ
M1
D1
M2
M1: INFINEON BSC123N08NS3-G
D1: DIODES INC PDS5100
L1: COILTRONICS HC9-100-R
M2: VISHAY SILICONIX Si2328DS
C
OUT
, C
IN
: MURATA GRM42-2X7R225K100R SEE SUGGESTED LAYOUT FIGURE 7
(CURRENT DERATED FOR V
IN
< 10V)
R3
1M
R4
16.9k
3761 TA02a
OPENLED
DIM/SSDIM
PWM
GND
ISP
ISN
GATE
PWMOUT
R
LED
0.25Ω
1A
60W
LED
STRING
V
IN
(V)
0
80
EFFICIENCY (%)
84
88
92
96
100
0.6
OUTPUT CURRENT (A)
0.8
1.0
1.2
1.4
1.6
10 20 30
37551 TA02b
605040
OUTPUT CURRENT
PWM TIED TO INTV
CC
EFFICIENCY
Q1
V
IN
LT3761
L1
10µH
D1
RTV
C
INTV
CC
EN/UVLO
FB
V
REF
SENSE
1M
2.2k
1N4148
100k
INTV
CC
INTV
CC
499k
2.2µF
×2
100V
4.7nF
10nF
2.2µF
×4
100V
V
IN
8V TO
60V
90.9k
5.1k
28.7k
350kHz
1µF
140k
CTRL
10mΩ
1M
M1
M2
16.9k
1k
1k
60W
LED
STRING
3761 TA10
OPENLED
DIM/SS
PWM
GND
ISP
ISN
GATE
PWMOUT
1A
D2
Q2
0.25Ω
150pF
2.4k
27k
27k
Q3
M1: INFINEON BSC123NO8NS3-G
D1: DIODES INC PDS5100
L1: COILTRONICS HC9-100-R
M2: VISHAY SILICONIX Si7113DN
D2: VISHAY 10BQ100
Q1, Q3: CENTRAL CMPT3906
Q2: ZETEX FMMT493