TOP221-227
TO-220 PACKAGE
Bias/Feedback
Return
High Voltage
Return
Kelvin-connected
auto-restart/bypass capacitor C5
and/or compensation network
Do not bend SOURCE pin.
Keep it short.
S
D
C
Bend DRAIN pin
forward if needed
for creepage.
C5
PC Board
Bias/Feedback
Input
Kelvin-connected
auto-restart/bypass
capacitor C5
and/or compensation
network
High-voltage Return
C5
Bias/Feedback Input
Bias/Feedback Return
TOP VIEW
DIP-8/SMD-8 PACKAGE
Bias/Feedback
Return
SOURCE
SOURCE
High Voltage
Return
C5
CONTROL
DRAIN
Kelvin-connected
Bias/Feedback
Input
auto-restart/bypass capacitor C5
and/or compensation network
TOP VIEW
PI-2021-041798
Figure 9. Recommended TOPSwitch Layout.
Design Tools
Alldatasheets, applicationliteratureandup-to-dateversionsof
theTransformerDesignSpreadsheetscanbedownloadedfrom
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.
The following tools available from Power Integrations greatly
simplify TOPSwitch based power supply design.
•DataBookandDesignGuideincludesextensiveapplication
information
• Excel Spreadsheets for Transformer Design - Use of this
toolisstronglyrecommendedforallTOPSwitchdesigns.
• Reference design boards – Production viable designs that
are assembled and tested.
C
9
12/97
POWERINT [ Power Integrations ]
