Datasheet

LT3761
23
3761f
Typical applicaTions
Boost LED Driver with Output Short-Circuit Protection with Internally Generated PWM
Output Short-Circuit Waveform Showing Hiccup
Mode Operation with Internally Generated PWM
High Side Disconnect Internally Generated
PWM Dimming Waveform
Q1
V
IN
LT3761
L1
10µH
D1
RTV
C
INTV
CC
EN/UVLO
FB
V
REF
SENSE
1M
28k
1N4148
124k
100k
INTV
CC
INTV
CC
499k
2.2µF
×2
100V
4.7nF
22nF
640Hz
10nF
2.2µF
×4
100V
V
IN
8V TO
60V
90.9k
5.1k
28.7k
350kHz
1µF
140k
CTRL
10mΩ
1M
M1
M2
LED
+
16.9k
1k
1k
60W
LED
STRING
CURRENT DERATED
FOR V
IN
< 10V
3761 TA09a
OPENLED
DIM/SSDIM
OPTION FOR
INTERNALLY GENERATED
PWM DIMMING
PWM
GND
ISP
ISN
GATE
PWMOUT
I
LED
1A
D2
Q2
M1: INFINEON BSC123NO8NS3-G
D1: DIODES INC PDS5100
L1: COILTRONICS HC9-100-R
M2: VISHAY SILICONIX Si7113DN
D2: VISHAY 10BQ100
Q1: CENTRAL CMPT3906
Q2: ZETEX FMMT493
OPTIONAL CIRCUIT
FOR ALWAYS-ON
OPERATION
0.25Ω
150pF
2.4k
20k
V
LED
+
0V
52V
1ms/DIV
PWMOUT
DIM = 8V
I
LED
+
2A/DIV
3761 TA09c
LED
+
SHORT TO GND
I
LED
0.5A/DIV
10µs/DIV
PWMOUT
3761 TA09b
V
IN
= 24V, V
LED
= 60V, DIM = 0V