SC414/SC424
13
Block Diagram
Reference
Soft Start
FB
AGND
On-time
Generator
Control & Status
PGOOD
Gate Drive
Control
VIN
PGND
TON
VOUT
Zero Cross Detector
ILIM
ENL
VLDO Switchover MUX
A
Y
B
LDO
VLDO
BST
FB Comparator
V5V
-
EN/PSV
Bypass Comparator
Bypass Comparator
DL
A
7
3
28
6
4
27
1
2
22
25
A = connected to pins 5, 8-11, PAD 2
B = connected to pins 15, 20, 21, PAD 3
C = connected to pins 13, 14, 16-19
D = connect to pins 3, 26, PAD 1
C
D
V
IN
V5V
V5V
V5V
V
IN
Bootstrap
Switch
Lo-side
MOSFET
Hi-side
MOSFET
Valley Current Limit
LX
B
LXBST
12
LXS
24
DL
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