SC417/SC427
15
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
VLDO
BST
FB Comparator
V5V
-
LX
EN/PSV
Bypass Comparator
Bypass Comparator
DH
DL
A
12
8
27
14
32
2
7
5
31
1
3
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
V5V
V5V
V5V
V
IN
Bootstrap
Switch
Lo-side
MOSFET
Hi-side
MOSFET
LXBST
13
LXS
28
DL
DL
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