Datasheet TOP242, TOP243, TOP244, TOP245, TOP246, TOP247, TOP248, TOP249, TOP250 (Power Integrations) - 2

TOP242-250
Section List
Functional Block Diagram
... 3
Pin Functional Description
.. 4
TOPSwitch-GX Family Functional Description
... 5 CONTROL (C) Pin Operation .. 6 Oscillator and Switching Frequency .. 6 Pulse Width Modulator and Maximum Duty Cycle .. 7 Light Load Frequency Reduction .. 7 Error Amplifier .. 7 On-Chip Current Limit with External Programmability ... 7 Line Undervoltage Detection (UV) ... 8 Line Overvoltage Shutdown (OV) .. 8 Line Feed-Forward with DC Reduction .. 8 MAX Remote ON/OFF and Synchronization .. 9 Soft-Start ... 9 Shutdown/Auto-Restart ... 9 Hysteretic Over-Temperature Protection ... 9 Bandgap Reference ... 10 High-Voltage Bias Current Source .. 10
Using Feature Pins
... 10 FREQUENCY (F) Pin Operation .. 10 LINE-SENSE (L) Pin Operation ... 10 EXTERNAL CURRENT LIMIT (X) Pin Operation ... 11 MULTI-FUNCTION (M) Pin Operation .. 11
Typical Uses of FREQUENCY (F) Pin
.. 14
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins
... 15
Typical Uses of MULTI-FUNCTION (M) Pin
... 17
Application Examples
.. 20 A High Efficiency, 30 W, Universal Input Power Supply ... 20 A High Efficiency, Enclosed, 70 W, Universal Adapter Supply ... 20 A High Efficiency, 250 W, 250-380 VDC Input Power Supply .. 22 Multiple Output, 60 W, 185-265 VAC Input Power Supply .. 23 Processor Controlled Supply Turn On/Off ... 24
Key Application Considerations
.. 26 TOPSwitch-II vs. TOPSwitch-GX .. 26 TOPSwitch-FX vs. TOPSwitch-GX .. 28 TOPSwitch-GXDesign Considerations .. 28 TOPSwitch-GX Layout Considerations ... 30 Quick Design Checklist .. 32 Design Tools ... 32
Product Specifications and Test Conditions
.. 33
Typical Performance Characteristics
.. 40
Part Ordering Information
... 46
Package Outlines
... 47
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Rev. R 10/20 www.power.com