Monolithic Power Systems, Inc. · NASDAQ:MPWR

Monolithic Power Systems — Technical Presentation

20 slides from Monolithic Power Systems's technical presentation

  1. Slide 1: EMI Virtual Lab

    EMI Virtual Lab Zheng Luo – MPS IS20.4 1 of 18

  2. Slide 2: Table of Contents

    Table of Contents Conducted EMI modeling and Case Study Radiated EMI Modeling and Case Study 2 of 18

  3. Slide 3: Traditional EMI Debug and Diagnostic Vs. Virtual Lab

    Traditional EMI Debug and Diagnostic Vs. Virtual Lab Traditional 3 of 18

  4. Slide 4: Conducted EMI Modeling

    Conducted EMI Modeling 4 of 18

  5. Slide 5: Virtual Lab Result vs. Measurement

    Virtual Lab Result vs. Measurement Test Condition: 12Vin, 5Vout, 3A Load current w/o filter, with spread spectrum 400kHz switching frequency Measured result Simulation result Spread spectrum effect DUT: 40V Buck Frequency (MHz) 5 of 18

  6. Slide 6: Case Study – Do We Need Active EMI Filter?

    Case Study – Do We Need Active EMI Filter? 6 of 18

  7. Slide 7: Conducted EMI Comparison

    Conducted EMI Comparison Passive Filter Active Filter Active Filter Passive Filter 7 of 18

  8. Slide 8: Noise Transfer Gain Analysis

    Noise Transfer Gain Analysis Active Filter >25dB better at switching frequency Passive Filter 8 of 18

  9. Slide 9: How about replace the Active Filter with a capacitor?

    How about replace the Active Filter with a capacitor? 9 of 18

  10. Slide 10: Noise Transfer Function: Active Filter vs. Just Cap

    Noise Transfer Function: Active Filter vs. Just Cap

  11. Slide 11: Conducted EMI Result: Active Filter Vs. 10uF Cap

    Conducted EMI Result: Active Filter Vs. 10uF Cap With 10uF Cap Active Filter As expected, 10uF cap is slightly better 11 of 18

  12. Slide 12: Radiated EMI Modeling

    Radiated EMI Modeling 12 of 18

  13. Slide 13: Virtual Lab Result vs. Measurement

    Virtual Lab Result vs. Measurement Test Condition: 12Vin, 10Vout, 350mA LED current w/o Filter DUT: 40V Buck-Boost LED Driver 13 of 18

  14. Slide 14: Case Study: Radiated EMI Analysis and Reduction

    Case Study: Radiated EMI Analysis and Reduction VSW, ID, ZGND1, ZGND2 are most important for radiated EMI on this Board 14 of 18

  15. Slide 15: Visualization the Key Elements for the Radiated EMI

    Visualization the Key Elements for the Radiated EMI 15 of 18

  16. Slide 16: How to Reduce the Total GND Impedance?

    How to Reduce the Total GND Impedance? 16 of 18

  17. Slide 17: Reduced Noise Source to Terminal CM Voltage Transfer Gain

    Reduced Noise Source to Terminal CM Voltage Transfer Gain 17 of 18

  18. Slide 18: Further Reduce the Impedance Inside the Package

    Further Reduce the Impedance Inside the Package 18 of 18

  19. Slide 19: Reduce the Switching Noise

    Reduce the Switching Noise 19 of 18

  20. Slide 20: Buck-Boost EMI Comparison – 1st Gen vs. 2nd Gen

    Buck-Boost EMI Comparison – 1st Gen vs. 2nd Gen 20 of 18

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