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TOP266EG Datasheet(PDF) 2 Page - Power Integrations, Inc. |
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TOP266EG Datasheet(HTML) 2 Page - Power Integrations, Inc. |
2 / 36 page Rev. B 03/10 2 TOP264-271 www.powerint.com Section List Functional Block Diagram ....................................................................................................................................... 3 Pin Functional Description ...................................................................................................................................... 3 TOP264-271 Functional Description ........................................................................................................................ 4 CONTROL (C) Pin Operation.................................................................................................................................... 5 Oscillator and Switching Frequency.......................................................................................................................... 5 Pulse Width Modulator ............................................................................................................................................ 5 Maximum Duty Cycle ............................................................................................................................................... 6 Error Amplifier .......................................................................................................................................................... 6 On-Chip Current Limit with External Programmability ............................................................................................... 6 Line Undervoltage Detection (UV)............................................................................................................................. 6 Line Overvoltage Shutdown (OV).............................................................................................................................. 7 Hysteretic or Latching Output Overvoltage Protection (OVP)..................................................................................... 7 Line Feed-Forward with DC MAX Reduction ................................................................................................................ 8 Remote ON/OFF ..................................................................................................................................................... 8 Soft-Start ................................................................................................................................................................. 9 Shutdown/Auto-Restart (for OCP, SCP, OPP)......................................................................................................... 10 Hysteretic Over-Temperature Protection (OTP) ....................................................................................................... 10 Bandgap Reference ............................................................................................................................................... 10 High-Voltage Bias Current Source .......................................................................................................................... 10 Typical Uses of FREQUENCY (F) Pin ...................................................................................................................... 12 Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins .......................................... 13 Application Examples .............................................................................................................................................. 15 Low No-load, High Efficiency, 65 W, Universal Input Adapter Power Supply ..................................................................... 15 Very low No-load, High Efficiency, 30 W, Universal Input, Open Frame, Power Supply .............................................................. 17 Key Application Considerations .............................................................................................................................. 18 TOPSwitch-JX vs.TOPSwitch-HX ........................................................................................................................ . 18 TOP264-271 Design Considerations ..................................................................................................................... 18 TOP264-271 Layout Considerations ...................................................................................................................... 20 Quick Design Checklist .......................................................................................................................................... 21 Design Tools .......................................................................................................................................................... 21 Product Specifications and Test Conditions .......................................................................................................... 23 Typical Performance Characteristics .................................................................................................................... 30 Package Outlines .................................................................................................................................................... 34 Part Ordering Information ........................................................................................................................................ 35 |
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