Pin No.
Pin Name
I/O
Description
-38-
IC DESCRIPTION -1/4 (TOP223P) -1/1
–
–
–
–
Y package-Output MOSFET source connection for high voltage power return.Primary side
circuit common and reference point.
P and G package-Primary side control circuit common and reference point.
Error amplifier and feedback current input pin for duty cycle control.Internal shunt regulator
connection to provide internal bias current during normal operation. It is also used as the
connection point for the supply bypass and auto-restart/compensation capacitor.
Output MOSFET drain connection.Provides internal bias current during start-up operation via an
internal switched high-voltage current source.Internal current sense point.
Output MOSFET source connection for high voltage power return.
1 ~ 3
4
5
6 ~ 8
SOURCE
CONTROL
DRAIN
SOURCE(HV RTN)
(P and G package only)
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9
9
2
8
9
4
2
9
8
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9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
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