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Low Standby Power AC Adapter L6562 + L6668

Low Standby Power AC Adapter L6562 + L6668. 90W 19V/4.7A AC-DC Converter Reference Design. 90W Adaptor General Features. Input Voltage range: 100 to 240Vac Output Voltage and current: 19V/4.7A Power Factor Correction: Above 0.98 Low Standby < 0.4W at no load condition

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Low Standby Power AC Adapter L6562 + L6668

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  1. Low Standby Power AC Adapter L6562 + L6668 90W 19V/4.7A AC-DC Converter Reference Design

  2. 90W Adaptor General Features Input Voltage range: 100 to 240Vac Output Voltage and current: 19V/4.7A Power Factor Correction: Above 0.98 Low Standby < 0.4W at no load condition High Efficiency, typical 82% at low line full load Latched OVP

  3. L6562 - Power Factor Correction • Transition Mode Control • Very Precise Adjustable Output Over Voltage Protection • Ultra-Low Startup Current (<70mA) • ON-CHIP Filter ON Current Sense • Disable Function • 1% internal reference voltage • -600mA/+800mA Totem Pole Gate Driver

  4. L6668 - PWM Controller • Current Mode Controller with sophisticated standby feature • On board high voltage startup • Low quiescent current (<2mA) • Slope Compensation • Pulse-by-pulse & Hiccup-Mode OCP • Interface with PFC Controller • Disable Function (on/off control) • Latched Disable for OVP/OTP Function • Programmable soft start

  5. L6668 – Standby Operation The device operates in different modes depending on the converter’s load condition 1.) Fixed Frequency at heavy load 2.) Frequency-foldback at medium load 3.) Burst Mode Control with no or very light load.

  6. This MOSFET has to withstand high stress for short period. L6668 + L6562 Operation Points to note: • PWM is powered up before PFC. • PFC is switched off during standby mode. PWM MOSFET has to withstand high stress for a short period of time under low line, full load before bulk capacitor voltage build up!

  7. L6668 -- Programmable Frequency Foldback

  8. L6668 -- Load Dependent Operating Mode

  9. L6668 -- Interface with PFC Controller

  10. L6668 -- Converter Output in Short Circuit

  11. 90W Demoboard Schematic

  12. Demoboard Layout

  13. PFC Inductor Inductance 0.7mH

  14. Main Transformer Inductance 0.7mH

  15. Demoboard Test Result – Power Factor

  16. Demoboard Test Result – Standby power loss No Load Power (mW) Input Voltage (Vac)

  17. Demoboard Test Result – Load Regulation 220Vac 100Vac Output Voltage Output Current

  18. Demoboard Test Result -- Line Regulation 0A output current 5A output current Output Voltage Input AC Voltage

  19. PFC Waveforms At 110Vac Ch.1 Current Waveform Ch2.: Bridge Rectifier output waveform At 220Vac Ch.1 Current Waveform Ch2.: Bridge Rectifier output waveform

  20. Main Converter Vdrain Normal Operating Waveform At 220Vac At 110Vac

  21. Main Converter Vdrain during Short Circuit Condition At 220Vac At 110Vac

  22. Demoboard BOM

  23. Demoboard BOM

  24. Demoboard BOM

  25. Demoboard BOM

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