Datasheet

LT3743
23
3743fd
TYPICAL APPLICATIONS
6V to 30V, 20A LED Driver with Switched Cathode
EN/UVLO
PWM
CTRL_SEL
EN/UVLO
PWM
V
CC_INT
HG
V
IN
CBOOT
V
REF
CTRL_L
CTRL_H
CTRL_T
LT3743
RT
SYNC
SW
LG
GND
V
CH
V
CL
SENSE
+
SENSE
–
PWMGL
PWMGH
V
CC_INT
150nF
L1
1.1µH
22µF
2.5mΩ
FB
10nF
34k
4.7nF
82.5k
60.4k
3743 TA05
10k
2.2nF
R
NTC
10k
82µF
M1
M2
10Ω
M3
D1: LUMINUS PT121
L1: MVR1261C-112ML
M1: RJK0365DPA
M2: RJK0328DPB
M3: SiR496DP
C1: PTPR330M9L (THREE IN PARALLEL)
V
IN
6V TO 30V
OUTPUT
20A MAXIMUM
C1
330µF
×3
D1
1µF
SS
R
HOT
499Ω
CONTROL
INPUT
10Ω
33nF
Switched Cathode PWM Dimming (100:1) 0A to 20A
PWM
5V/DIV
I
LED
10A/DIV
SW
10V/DIV
10µs/DIV
3743 TA05b
0A to 20A Efficiency
PWM DIMMING DUTY CYCLE (%)
0
EFFICIENCY (%)
60
80
100
80
3743 TA05c
40
20
50
70
90
30
10
0
20
40
60
100
V
IN
= 12V
GREEN LED