TOP221-227
TO-220 PACKAGE
Bias/Feedback
Return
C
S
High Voltage
Return
D
Kelvin-connected
auto-restart/bypass capacitor C5
and/or compensation network
CONTROL
SOURCE
DRAIN
Do not bend SOURCE pin.
Keep it short.
Bend DRAIN pin
forward if needed
for creepage.
High-voltage Return
Bias/Feedback
Input
PC Board
Kelvin-connected
auto-restart/bypass
capacitor C5
Bias/Feedback Input
and/or compensation
network
Bias/Feedback Return
C5
C5
TOP VIEW
DIP-8/SMD-8 PACKAGE
Bias/Feedback
Return
SOURCE
C5
CONTROL
High Voltage
Return
SOURCE
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.
D
7/01
9
POWERINT [ POWER INTEGRATIONS, INC. ]
