Datasheet

LT3743
11
3743fd
BLOCK DIAGRAM
–
+
–
+
PWM
COMPARATOR
HIGH SIDE
DRIVER
CBOOT
HG
SW
LG
3k
LOW SIDE
DRIVER
R Q
S
g
m
AMP
g
m
= 475µA/V
R
O
= 3.5M
I
OUT
= 40µA
OSCILLATOR
2V REFERENCE
5.5µA
90k
1.5V
CURRENT
MIRROR
SYNC
RT
16
CTRL_H
6
CTRL_L
CTRL BUFFER
VOLTAGE
REGULATOR
AMP
OPEN-LED
COMPARATOR
7
SS
8
V
CL
13
V
CH
14
CTRL_SEL
17
PWM
18
CTRL_T
4
V
REF
3
EN/UVLO
V
IN
2
25
V
CC_INT
27
V
IN
28
23
24
26
SENSE
+
15
SYNCRONOUS
CONTROLLER
INTERNAL
REGUALTOR
AND
UVLO
2.2nF
100nF
8.2nF
47µF
0.1µF
330µF
×3
33nF
330µF
×3
10A LED
10Ω
2.2µH
R
S
5mΩ
OUTPUT
10µF
V
IN
SYNC
402k
133k
82.5k
–
+
–
+
11
SENSE
–
12
FB
10
PWMGL
–
+
+
+
10k
1V
1.3V
2.5Ω
2.5Ω
40.2k
34k
8.2nF
34k
22
PWMGH
3743 F01
19
10Ω
Figure 1. Block Diagram
(QFN Package)