TOP221-227
TO-220 PACKAGE
Bias/Feedback
Return
CS
High Voltage
Return
D
Kelvin-connected
auto-restart/bypass capacitor C5
and/or compensation network
Bias/Feedback
C5
PC Board
Input
Kelvin-connected
auto-restart/bypass
C5
capacitor C5
and/or compensation Bias/Feedback Input
network
TOP VIEW
Bias/Feedback Return
Do not bend SOURCE pin.
Keep it short.
Bend DRAIN pin
forward if needed
for creepage.
High-voltage Return
DIP-8/SMD-8 PACKAGE
Bias/Feedback
Return
SOURCE
C5
SOURCE
High Voltage
Return
CONTROL
DRAIN
Kelvin-connected
Bias/Feedback auto-restart/bypass capacitor C5
Input
and/or compensation network
TOP VIEW
Figure 9. Recommended TOPSwitch Layout.
PI-2021-041798
Design Tools
The following tools available from Power Integrations greatly
simplify TOPSwitch based power supply design.
• Data Book and Design Guide includes extensive application
information
• Excel Spreadsheets for Transformer Design - Use of this
tool is strongly recommended for all TOPSwitch designs.
• Reference design boards – Production viable designs that
are assembled and tested.
All data sheets, application literature and up-to-date versions of
the Transformer Design Spreadsheets can be downloaded from
our Web site at www.powerint.com. A diskette of the
Transformer Design Spreadsheets may also be obtained by
sending in the completed form provided at the end of this data
sheet.
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