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TOP244GN-TL Datasheet(PDF) 2 Page - Power Integrations, Inc. |
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TOP244GN-TL Datasheet(HTML) 2 Page - Power Integrations, Inc. |
2 / 52 page TOP242-250 M 12/04 2 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 Under-Voltage Detection (UV)......................................................................................................................... 8 Line Overvoltage Shutdown (OV) ........................................................................................................................... 8 Line Feed-Forward with DC MAX Reduction .............................................................................................................. 8 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-GX Design 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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