lt3743 Linear Technology Corporation, lt3743 Datasheet - Page 23

• Manufacturer Part Number: lt3743
• Description: High Current Synchronous Step-down Led Driver With Three-state Control
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIONS
Switched Cathode PWM Dimming (100:1) 0A to 20A
10A/DIV
10V/DIV
5V/DIV
PWM
I
LED
SW
2nF
10μs/DIV
R
45.3k
R
680k
HOT
NTC
82.5k
CONTROL
EN/UVLO
10nF
V
INPUT
CC_INT
PWM
6V to 30V, 20A LED Driver with Switched Cathode
3743 TA05b
EN/UVLO
PWM
CTRL_SEL
RT
SYNC
V
CTRL_L
CTRL_H
CTRL_T
SS
REF
VCL
LT3743
PWMGH
PWMGL
V
SENSE
SENSE
CBOOT
VCH
CC_INT
GND
SW
V
HG
34k
LG
FB
IN
+
–
4.7nF
150nF
20μF
1μF
D1: LUMINUS PT121
L1: MVR1261C-112ML
M1: RJK0365DPA
M2: RJK0328DPB
M3: SiR496DP
M1
M2
1.1μH
L1
100
90
80
70
60
50
40
30
20
10
0
80μF
0
2.5mΩ
PWM DIMMING DUTY CYCLE (%)
V
6V TO 30V
20
IN
0A to 20A Effi ciency
20A MAXIMUM
M3
40
V
D1
OUT
60.4k
10k
3743 TA05
60
1mF
V
GREEN LED
IN
80
= 12V
3743 TA05c
100
LT3743
23
3743f