SC403
14
Block Diagram
Reference
Soft Start
FB
AGND
On-time
Generator
Control & Status
PGOOD
Gate Drive
Control
VIN
PGND
TON
VOUT
Zero Cross Detector
Valley Current Limit
ILIM
ENL
FBL
VLDO Switchover MUX
A
Y
B
LDO
VDD
BST
FB Comparator
-
LX
EN/PSV
Bypass Comparator
Bypass Comparator
NC
NC
A
12
8
27
14
32
5
3
2
31
1
26
29
A = connected to pins 6, 9-11, PAD 2
B = connected to pins 23-25, PAD 3
C = connected to pins 15-22
D = connect to pins 4, 30, PAD 1
B
C
D
V
IN
VDD
VDD
V
IN
Bootstrap
Switch
Lo-side
MOSFET
Hi-side
MOSFET
LXBST
13
LXS
28
DL
DL
VDD
VDD
VDD
SS
7
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