Monolithic Power Systems, Inc. · NASDAQ:MPWR

Monolithic Power Systems — Technical Presentation (September 2019)

59 slides from Monolithic Power Systems's technical presentation, Sep 25, 2019

  1. Slide 1: Understanding EMI Issues in Power Design and How to Best Mitigate Them

    Understanding EMI Issues in Power Design and How to Best Mitigate Them Speaker: Christian Kueck September 2019 Sponsored by Starts at 8 AM Pacific 11 AM Eastern 17:00 MESZ 15:00 UTC rev 20180330

  2. Slide 2: Industrial Automation Components

    BD LVL INDUSTRIAL AUTOMATION (Components) LO End Application Completeness HI HI Technical Breadth Required to Use/Incorporate LO LO Product Cost HI HI Development Cost LO Confidential – NDA Restricted

  3. Slide 3: Module Boards Industrial Automation Components

    BD LVL MODULE BOARDS INDUSTRIAL AUTOMATION (Components) LO End Application Completeness HI HI Technical Breadth Required to Use/Incorporate LO LO Product Cost HI HI Development Cost LO Confidential – NDA Restricted

  4. Slide 4: Quantity and Sales

    400% 350% 300% 250% Quantity Sales 200% 150% 100% 50% 0% 2014 2015 2016 2017 2018 2014 2015 2016 2017 2018 Qty Sales Confidential – NDA Restricted

  5. Slide 5: Price of Board vs Quantity and Revenue

    $10 $20 $30 $40 $50 $60 $70 $80 $90 $100 $110 $120 $130 $140 $150 $160 $170 $180 $190 Price of Bd Quantity Revenue Confidential – NDA Restricted

  6. Slide 6: Speaker Intro: Christian Kueck

    Speaker Intro: Christian Kueck • Senior FAE supporting automotive Tier-1 customers throughout Germany • Over two decades of experience managing EMI challenges • Deeply involved in the definition and compliance testing of our leading AEC-Q100 power management solutions • 22 years at Linear Technology

  7. Slide 7: Agenda

    Agenda PSU Fixed-Frequency Emission Spectrum MPS Module Construction EMI Disturbance Sources with Module Examples Counteracting Magnetic Disturbances Spread Spectrum and Its Benefits Impact of Switching Frequency Open Q&A

  8. Slide 8: Fixed-Frequency PSU Spectrum

    Fixed-Frequency PSU Spectrum The typical PSU switch excitation source creates a flat periodic “fence” of spurs in the frequency domain, spaced by the switching frequency. f fSW 2fSW 3fSW 4fSW 5fSW 6fSW

  9. Slide 9: Fixed-Frequency PSU Spectrum

    Fixed-Frequency PSU Spectrum 5th Order Slope At a certain frequency, it will attenuate like a high-order low pass. For most modern hard switch designs, there should not be much energy left above 500MHz. PSUs have harmonics into the high triple digits. Spread spectrum on high harmonics is seldom cove

  10. Slide 10: EMI Coupling Galvanic through Trace Connections

    EMI Coupling Galvanic through Trace Connections Conductive EMI coupling PSU as source RF Voltage Source Harness Harness

  11. Slide 11: MPS Modules – How They Look Inside

    MPS Modules – How They Look Inside MPS module construction: They keep EMI-emitting loops compact.

  12. Slide 12: Example: MPM3515, a 36V, 1.2A, Buck Module PCB 1

    Example: MPM3515, a 36V, 1.2A, Buck Module PCB 1 Module buck MPM3515 Module Pin-Out example: PCB1 Thermally optimized, not EMI optimized

  13. Slide 13: MPM3515 Module PCB 1 L1 L2

    MPM3515 Module PCB 1 L1 L2 Example: PCB 1, Layers 1 and 2

  14. Slide 14: MPM3515 Module PCB 1 L3 L4

    MPM3515 Module PCB 1 L3 L4 Example: PCB 1, Layers 3 and 4

  15. Slide 15: MPM3515 Module PCB 2

    MPM3515 Module PCB 2 Example: PCB 2 Same module, EMI-optimized. Photo and top layers.

  16. Slide 16: MPM3515 Module PCB 2 L1 L2

    MPM3515 Module PCB 2 Example: PCB 2, Layers 1 and 2 L1 L2

  17. Slide 17: MPM3515 Module PCB 2 L3 L4

    MPM3515 Module PCB 2 Example: PCB 2, Layers 3 and 4 L3 L4 Single PGND connection to outside GND plane

  18. Slide 18: MPM3515 PCB 1 Conducted Emissions

    MPM3515 Module PCB 1 – 12.8V, 3V3, 1A1, CE AV, 150kHz to 108MHz, PCB 1 PCB 1: Poor EMI with CIN4 placed near filter

  19. Slide 19: MPM3515 PCB 1 Relocating CIN4 Bottom Side

    MPM3515 Module PCB 1 – 12.8V, 3V3, 1A1, CE AV, 150kHz to 108MHz Relocating CIN4 Bottom Side PCB 1: Improvement after moving CIN4 CIN4 moved

  20. Slide 20: MPM3515 PCB 1 without CIN4

    MPM3515 Module PCB 1 – 12.8V, 3V3, 1A1, CE AV, 150kHz to 108MHz, PCB 1 without CIN4 PCB 1: More improvement after removing CIN4

  21. Slide 21: MPM3515 PCB 1 Relocating CIN4 Top Side

    MPM3515 Module PCB 1 – 12.8V, 3V3, 1A1, CE AV, 150kHz to 108MHz Relocating CIN4 Top Side PCB 1: CIN4 moved to top side

  22. Slide 22: MPM3515 PCB 1 Relocating CIN4 Top Side

    MPM3515 Module PCB 1 – 12.8V, 3V3, 1A1, Relocating CIN4 Top Side Always have an inductive component connecting the PSU section with its filter section.

  23. Slide 23: MPM3515 PCB 2 Conducted Emissions

    MPM3515 Module PCB 2 – 12.8V, 3V3, 1A1, CE AV, 150kHz to 108MHz PCB 2: Much quieter, especially in the FM range

  24. Slide 24: MPM3515 PCB 1 without CIN4 for Comparison

    MPM3515 PCB 1 without CIN4 for Comparison PCB 1: CIN4 moved to top side for comparison

  25. Slide 25: PCB 1 Low-Frequency Radiated Emission

    MPM3515 Module PCB 1 – 12.8V, 3V3, 1A1, RE Mono-Pole AV, 150kHz to 30MHz PCB 1: Low-frequency radiated emission

  26. Slide 26: PCB 1 Radiated Emission without CIN4

    MPM3515 Module PCB 1 – 12.8V, 3V3, 1A1, RE Mono-Pole AV, 150kHz to 30MHz without CIN4 PCB 1: Low-frequency radiated emission, does not change much after removing CIN4

  27. Slide 27: PCB 1 Radiated Emission, CIN4 Bottom Side

    MPM3515 Module PCB 1 – 12.8V, 3V3, 1A1, RE Mono-Pole AV, 150kHz to 30MHz Relocating CIN4 to Bottom Side PCB 1: Low Frequency radiated emission. Does not change much after relocating CIN4.

  28. Slide 28: PCB 2 Low-Frequency Radiated Emission

    PCB 2 – 12.8V, 3V3, 1A1, RE Mono-Pole AV, 150kHz to 30MHz PCB 2: Low-frequency radiated emission There are few differences in the low frequency range compared to PCB 1.

  29. Slide 29: PCB 1 High-Frequency Radiated Emission

    PCB 1 – 12.8V, 3V3, 1A1, RE AV, 30Mhz to 1GHz PCB 1: High-frequency radiated emission, noisy

  30. Slide 30: PCB 1 High-Frequency, CIN4 Relocated to Top Side

    PCB 1 – 12.8V, 3V3, 1A1, RE AV, 30Mhz to 1GHz, CIN4 Relocated to Top Side PCB 1: High-frequency radiated emission There is a small improvement after relocating CIN4

  31. Slide 31: PCB 2 High-Frequency Radiated Emission

    PCB 2 – 12.8V, 3V3, 1A1, RE AV, 30Mhz to 1GHz PCB 2: High-frequency radiated emission Quieter than PCB 1, resonance due to 1.7m harness.

  32. Slide 32: PCB 2 VIN Cable Shortened

    PCB 2 – 12.8V, 3V3, 1A1, RE AV, 30Mhz to 1GHz, VIN Cable Shorted from 1.7m to 0.2m This peak is the cable resonance with the PCB on top PCB 2: High-frequency radiated emission Quieter than PCB 1, resonance moved higher with 0.2m harness.

  33. Slide 33: E-Field/Capacitive Near-Field Coupling

    E-Field/Capacitive Near-Field Coupling With E-field/capacitive near-field coupling of components and PCB traces Other EMI coupling mechanism Works like capacitor plate coupling

  34. Slide 34: H-Field/Magnetic Near-Field Coupling

    H-Field/Magnetic Near-Field Coupling With H-Field/magnetic near-field coupling and shielding of components and PCB added Other EMI coupling Works like aircore transformer coupling mechanism

  35. Slide 35: Far-Field Radiation

    Far-Field Radiation With electromagnetic far-field radiation and reception added Other EMI coupling mechanism Components and traces act as antennas

  36. Slide 36: Magnetic Field = Low Impedance; E-Field = High Impedance

    Magnetic Field = Low Impedance; E-Field = High Impedance Difference in H-field and E-field source Regardless of source at λ/2π distance, all radiation matches the far-field impedance. Free air with ϵr = 1 and µr = 1 MHz Meter 1 47.75 10 4.77 30 1.59 50 0.95 100 0.477 300 0.159 500 0.095 1000 0.048 3

  37. Slide 37: Damping Needed

    Damping Needed What is needed to keep EMI in check A 1W, 1MHz PSU that matches its switch node to 50Ω creates a +30dBm = 147dBµV (1W @ 50Ω) emitter @1MHz. At 100MHz this is still -10dBm = 97dBµV (assume -20dB/dec for harmonics). CISPR25 ask at 100MHz Cat5 here for 18dBµV for CE. Most OEMs are more s

  38. Slide 38: Filter In Theory (or Spice) is Easy

    Filter In Theory (or Spice) is Easy What a theoretical filter can do

  39. Slide 39: Input Filter In Practice

    Input Filter In Practice What a real-world filter does It is much harder to get sufficient damping at high frequencies when using a real-world filter. http://www.schwarzbeck.de/appnotes/EMIRcvrCISPR16.pdf

  40. Slide 40: Noise Floor

    Noise Floor Instrument limits http://www.schwarzbeck.de/appnotes/EMIRcvrCISPR16.pdf

  41. Slide 41: Magnetic Coupling is an Aspect Ratio Game

    Magnetic Coupling is an Aspect Ratio Game How to lay out an EMI filter The further apart the components are, the less they couple 1 2 3 4 +VIN To switcher Emitter Good: Good: on fixed 90-degree large 1. Filter 2. Filter location rotation, distance section section Bad: less Close coupling position co

  42. Slide 42: Magnetic Attenuation Eddy Current Experiment

    Magnetic Attenuation Eddy Current Experiment Magnetic shielding capability of eddy currents

  43. Slide 43: Magnetic Coupling Simulation

    Magnetic Coupling Simulation Simulation of magnetic plane shielding performance Relative Gain or Attenuation Magnetic Field Sensor 10mm 1A each Magnetic Field Probe

  44. Slide 44: Magnetic Coupling Simulation

    Magnetic Coupling Simulation Simulation of magnetic plane shielding performance Magnetic Sensor Hot Loop Current

  45. Slide 45: PSU Layer Stack

    PSU Layer Stack How to plan the layer stack for a very low-EMI PSU Minimum Distance Top Power Component Routing GND Aux Signals Quiet GND and Filter

  46. Slide 46: MPM3515 PSU Hot Loop

    MPM3515 PSU Hot Loop Current flow in the hot-loop decoupling

  47. Slide 47: MPM3550 – 36V IN, 5A Out, Low-EMI Module in LGA-18 Package

    MPM3550 – 36VIN, 5A Out, Low-EMI Module in LGA-18 Package Metal can module

  48. Slide 48: MPM3550 Efficiency – 12V to 3V3

    MPM3550 Efficiency – 12V to 3V3 Efficiency and thermal load of the metal can module

  49. Slide 49: MPM3550 Conducted Emissions

    MPM3550 – 12.8V, 3V3, 1A8, CE AV, 150kHz to 108MHz Ultra-low EMI metal can module CE Extremely Quiet in FM Area -10dBµV

  50. Slide 50: MPM3550 Radiated Emission below 30MHz

    MPM3550 – 12.8V, 3V3, 1A8, RE Mono-Pole AV, 150kHz to 30MHz Ultra-low EMI metal can module RE < 30MHz

  51. Slide 51: MPM3550 Radiated Emission 30MHz to 1GHz

    MPM3550 – 12.8V, 3V3, 1A8, RE AV, 30Mhz to 1GHz Ultra-low EMI metal can module RE > 30 MHz

  52. Slide 52: EMI Receiver Spectral View on a Fixed-Frequency Switcher

    EMI Receiver Spectral View on a Fixed-Frequency Switcher What does spread spectrum offer? Area where you can still hide spur energy that the EMI receiver does not see f fSW 2fSW 3fSW 4fSW 5fSW 6fSW

  53. Slide 53: Maximum Benefit of Perfect Spread Spectrum

    Maximum Benefit of Perfect Spread Spectrum That is the maximum spread spectrum offers 𝑅𝐵𝑊 Attenuation = 10 * log10 Maximum Achievable Spread Spectrum Attenuation 𝑓𝑠𝑤 0.15MHz to 30MHz 30MHz to 1GHz >1GHz RBW [MHz] 0.009 0.12 1 fSW [MHz] 0.1 -10.5 0.0 0.0 0.2 -13.5 -2.2 0.0 0.4 -16.5 -5.2 0.0 1…

  54. Slide 54: Spread Spectrum Benefits

    Spread Spectrum Benefits Spectral method spread spectrum works independently from other EMI mitigation methods like filtering, layout, and shielding. Therefore, fixed-frequency results provide additional attenuation from spread spectrum, regardless of whether one measures conducted or radiated. A go

  55. Slide 55: Switching Frequency Effect on EMI

    Switching Frequency Effect on EMI Does it make sense to increase the switching frequency? Doubling the switching frequency doubles the number of switch transitions, which doubles the EMI energy. That is 3dB more (power is 10 * log(2)). But with double the frequency, only half the bins are available

  56. Slide 56: Switching Frequency Effect on EMI Answer: Usually not

    Switching Frequency Effect on EMI Answer: Usually not With fixed frequency for every doubling, only half the bins are available for If all stays the same except the switching frequency: the energy. The result is 6dB/octave = 20db/decade Fixed Frequency EMI Increase in dB Perfect Spread Spectrum EMI

  57. Slide 57: Conclusion

    Conclusion Multi-layer boards offer superior EMI performance compared with two-layer or single-layer boards Keep distance between the EMI filter and the PSU components Use a GND plane in the second layer. If there are multiple layers, the noisy part can be cut around Modules are quiet because they h

  58. Slide 58: Q&A

    Q&A New MPS EMI test center in Hangzhou, China Additional labs are currently being built in Germany and Detroit, USA

  59. Slide 59: Free Evaluation Board

    Free Evaluation Board Thank you for attending the Webinar. All attendees will receive a coupon code good for a free evaluation board or kit* via email by 9/27/2019 for redemption on the MPS website. *up to $25 dollars

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