Datasheet

LT3741/LT3741-1
11
37411fg
For more information www.linear.com/LT3741
(QFN Package)
Figure 2. Block Diagram, LT3741-1
–
+
–
+
–
+
PWM
COMPARATOR
HIGH SIDE
DRIVER
CBOOT
HG
SW
LG
3k
LOW SIDE
DRIVER
ZERO CROSS
COMPARATOR
R Q
S
g
m
AMP
g
m
= 475µA/V
R
O
= 3.5M
I
OUT
= 40µA
OSCILLATOR
2V REFERENCE
11µA
90k
1.5V
CURRENT
MIRROR
SYNC
RT
13
CTRL1
5
CTRL BUFFER
VOLTAGE
REGULATOR
AMP
g
m
= 850µA/V
SS
6
VC
10
CTRL2
3
V
REF
2
EN/UVLO
V
IN
1
17
V
CC_INT
19
V
IN
20
15
16
18
SENSE
+
12
SYNCRONOUS
CONTROLLER
INTERNAL
REGULATOR
AND
UVLO
100nF
100nF
5.6nF
47µF1µF
0.1µF
150µF
×2
2.4µH
R
S
5mΩ
V
OUT
10µF
V
IN
SYNC
402k
133k
82.5k
–
+
8
SENSE
–
9
FB
7
–
+
+
10k
1.21V
40.2k
40.2k
3741 F01
BLOCK DIAGRAM
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