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TOP233G Datasheet(PDF) 2 Page - Power Integrations, Inc. |
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TOP233G Datasheet(HTML) 2 Page - Power Integrations, Inc. |
2 / 36 page TOP232-234 2 B 7/01 Section List Pin Functional Description ......................................................................................................................................... 3 TOPSwitch-FX Family Functional Description ......................................................................................................... 4 CONTROL (C) Pin Operation ................................................................................................................................. 4 Oscillator and Switching Frequency ....................................................................................................................... 5 Pulse Width Modulator and Maximum Duty Cycle ................................................................................................. 5 Minimum Duty Cycle and Cycle Skipping ............................................................................................................... 6 Error Amplifier ......................................................................................................................................................... 6 On-chip Current Limit with External Programability ................................................................................................ 6 Line Under-Voltage Detection (UV) ........................................................................................................................ 6 Line Overvoltage Shutdown (OV) ........................................................................................................................... 7 Line Feed Forward with DC MAX Reduction .............................................................................................................. 7 Remote ON/OFF and Synchronization ................................................................................................................... 7 Soft-Start ................................................................................................................................................................ 8 Shutdown/Auto-Restart .......................................................................................................................................... 8 Hysteretic Over-Temperature Protection ................................................................................................................ 8 Bandgap Reference ................................................................................................................................................ 8 High-Voltage Bias Current Source .......................................................................................................................... 8 Using FREQUENCY and MULTI-FUNCTION Pins ..................................................................................................... 9 FREQUENCY (F) Pin Operation ............................................................................................................................. 9 MULTI-FUNCTION (M) Pin Operation .................................................................................................................... 9 Typical Uses of FREQUENCY (F) Pin ...................................................................................................................... 11 Typical Uses of MULTI-FUNCTION (M) Pin ............................................................................................................. 12 Application Examples ............................................................................................................................................... 14 A High Efficiency, 30 W, Universal Input Power Supply ........................................................................................ 14 35 W Multiple Output Power Supply ..................................................................................................................... 15 17 W PC Standby Power Supply .......................................................................................................................... 16 Processor Controlled Supply Turn On/Off ............................................................................................................ 17 Key Application Considerations .............................................................................................................................. 19 TOPSwitch-FX vs. TOPSwitch-ll ........................................................................................................................... 19 TOPSwitch-FX Design Considerations ................................................................................................................. 20 TOPSwitch-FX Selection ................................................................................................................................ 20 Input Capacitor ............................................................................................................................................... 20 Primary Clamp and Output Reflected Voltage V OR ......................................................................................... 20 Output Diode .................................................................................................................................................. 21 Soft-Start ........................................................................................................................................................ 21 EMI ................................................................................................................................................................. 21 Transformer Design ........................................................................................................................................ 21 Standby Consumption .................................................................................................................................... 23 TOPSwitch-FX Layout Considerations ................................................................................................................. 23 Primary Side Connections .............................................................................................................................. 23 Y-Capacitor..................................................................................................................................................... 23 Heat Sinking ................................................................................................................................................... 23 Quick Design Checklist ......................................................................................................................................... 23 Design Tools ......................................................................................................................................................... 23 Product Specifications and Test Conditions .......................................................................................................... 24 Typical Performance Characteristics ...................................................................................................................... 30 Package Outlines ...................................................................................................................................................... 34 |
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