LT3743 Datasheet, PDF (21/28 Pages) Linear Technology – High Current Synchronous Step-Down LED Driver with Three-State Control

TYPICAL APPLICATIONS
12V, 20A LED Driver
LT3743
EN/UVLO EN/UVLO
V_IN
PWM PWM
1μF
CTRL_SEL CTRL_SEL
V_IN
12V
200μF
82.5k
2nF
40k
R_HOT
45.2k
40k
RT
HG
SYNC
CBOOT
V_REF LT3743 SW
CTRL_L
V_{CC_INT}
CTRL_H
LG
GND
100nF
20μF
M1
L1
1.0μH 2.5mΩ
M2
V_OUT
20A MAXIMUM
1μF
D1
1mF
1mF
R_NTC
680k
CTRL_T
SENSE⁺
SENSE^–
PWMGH
M3
M4
SS
10nF
VCL
34k
4.7nF
PWMGL
FB
VCH
34k
4.7nF
D1: LUMINUS PT120
L1: IHLP4040DZER1R0M01
M1: RJK0365DPA
M2: RJK0346DPA
M3, M4: Si7236DP
1mF
40.2k
10k
3743 TA02
Efficiency (Stepping from 2A to 20A)
94
V_IN = 12V
92 ^{GREEN LED}
90
88
86
84
82
80
0
20
40
60
80 100
CTRL_SEL DIMMING DUTY CYCLE (%)
3743 TA02b
3743f
21