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TOP257LN Datasheet(PDF) 3 Page - Power Integrations, Inc. |
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TOP257LN Datasheet(HTML) 3 Page - Power Integrations, Inc. |
3 / 49 page Rev. F 01/09 3 TOP252-262 www.powerint.com Section List Functional Block Diagram ....................................................................................................................................... 4 Pin Functional Description ...................................................................................................................................... 6 TOPSwitch-HX Family Functional Description ....................................................................................................... 7 CONTROL (C) Pin Operation .................................................................................................................................... 8 Oscillator and Switching Frequency.......................................................................................................................... 8 Pulse Width Modulator ............................................................................................................................................ 9 Maximum Load Cycle .............................................................................................................................................. 9 Error Amplifier .......................................................................................................................................................... 9 On-Chip Current Limit with External Programmability ............................................................................................... 9 Line Under-Voltage Detection (UV).......................................................................................................................... 10 Line Overvoltage Shutdown (OV)............................................................................................................................ 11 Hysteretic or Latching Output Overvoltage Protection (OVP)................................................................................... 11 Line Feed-Forward with DC MAX Reduction .............................................................................................................. 13 Remote ON/OFF and Synchronization.................................................................................................................... 13 Soft-Start ............................................................................................................................................................... 13 Shutdown/Auto-Restart ......................................................................................................................................... 13 Hysteretic Over-Temperature Protection ................................................................................................................. 13 Bandgap Reference ............................................................................................................................................... 13 High-Voltage Bias Current Source .......................................................................................................................... 13 Typical Uses of FREQUENCY (F) Pin ...................................................................................................................... 15 Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins .......................................... 16 Typical Uses of MULTI-FUNCTION (M) Pin ........................................................................................................... 18 Application Examples .............................................................................................................................................. 21 A High Efficiency, 35 W, Dual Output – Universal Input Power Supply..................................................................... 21 A High Efficiency, 150 W, 250-380 VDC Input Power Supply............................................ ...................................... 22 A High Efficiency, 20 W Continuous – 80 W Peak, Universal Input Power Supply ................................................... 23 A High Efficiency, 65 W, Universal Input Power Supply ........................................................................................... 24 Key Application Considerations .............................................................................................................................. 25 TOPSwitch-HX vs.TOPSwitch-GX ....................................................................................................................... . 25 TOPSwitch-HX Design Considerations .................................................................................................................. 26 TOPSwitch-HX Layout Considerations ................................................................................................................... 27 Quick Design Checklist .......................................................................................................................................... 31 Design Tools .......................................................................................................................................................... 31 Product Specifications and Test Conditions .......................................................................................................... 32 Typical Performance Characteristics .................................................................................................................... 39 Package Outlines .................................................................................................................................................... 43 Part Ordering Information 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