lt3741 Linear Technology Corporation, lt3741 Datasheet - Page 11

• Manufacturer Part Number: lt3741
• Description: High Power, Constant Current, Constant Voltage, Step-down Controller
• Manufacturer: Linear Technology Corporation

block Diagram
100nF
100nF
5.6µF
82.5k
40.2k
SYNC
402k
133k
V
IN
13
12
10
1
2
5
6
3
EN/UVLO
V
SYNC
RT
CTRL1
SS
CTRL2
VC
REF
1.5V
+
+
–
CTRL BUFFER
(QFN Package)
2V REFERENCE
OSCILLATOR
11µA
CURRENT
MIRROR
90k
Figure 1. Block Diagram
–
+
COMPARATOR
PWM
g
g
R
I
g
OUT
REGULATOR
m
m
O
m
VOLTAGE
AMP
= 450µA/V
= 4M
= 850µA/V
= 40µA
AMP
R
S
Q
–
+
–
+
SYNCRONOUS
CONTROLLER
REGULATOR
INTERNAL
UVLO
AND
1.21V
3k
LOW SIDE
HIGH SIDE
DRIVER
DRIVER
V
SENSE
SENSE
CBOOT
CC_INT
SW
V
HG
LG
FB
3741 F01
IN
+
–
20
19
17
15
16
18
8
9
7
1µF
40.2k
10k
R
5m
2.4µH
LT3741
47µF
0.1µF
S
V
IN
150µF
10µF
2

V
OUT
3741f