KEMET Metcom SMD power inductor series interviewMay 2020, Alexander Nebel & Michael Freitag

MSA KEMET Webinar

SMD power inductor MPX & MPXV series

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• Metal composite power inductor technology advantageso Q-factor and origin of losses

• Performance limitation and losses• Saturation behavior• E2DI strategy (Easy to design in)• What comes next ? Copper

CoilSMD Terminal

METCOMcore material

METCOM power inductor technologyadvanced DC soft- or hard switching application

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• The Q – factor is a good measure of efficiency as it relates the inductance to the resistance (DC & AC resistance) –> Q = 2π*f*L/ R or Z/R

• The sweet spot for METCOM is roughly from 700kHz up to 3MHz where the Q is high and losses are low (in this case ≥80 for the 0630 / 1µH)

• An assembled ferrite inductor has a sweet spot from 200kHz to 800kHz• Saturation behaviour of METCOM

is soft, a steady L decline by current• Bigger current transients will still be

filtered, but with a lower inductance• In addition to the DC losses the AC

and switching DC losses need to beconsidered with thermal heat rise

0530

0630ferrite

4

Performance limitation and losses

DC Copper LossCommonly referred to as DCR, it is the loss in the form of heat due to the resistance of the windings of the inductor.

AC Copper LossIs the loss of the copper with AC currents which result from the skin effect of a conductor which effectively reduces the cross section of the wire with increasing frequency

Core LossIs the magnetic loss of a magnetic material which operates at alternating flux conditions and are the result of changing the direction those increase with frequency (B-H hysteresis)

Skin Effect

-8

-4

0

4

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-60

-10

40

0 500 1000

I nominal V

Eddy Current

B-H Hysteresis

𝛿𝛿 =2𝜌𝜌

𝜔𝜔𝜇𝜇𝑟𝑟𝜇𝜇0

Detailed view of losses

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Core loss Copper loss

Performance limitation and losses (heat)

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• Thermal heat rise depend on all “significant” losses reduced by thermal resistance (depends on layer thickness of PCB & airgap of coil vs. core)

• Airflow around the inductor is usually not possible within automotive ECU´s• Practically the power loss is a sum of the power losses caused by:

o DC current (the higher the worse and increases exponentially with current)o Relation of voltage change i.e. 12V input 3.3V output = 8.7V (the higher the worse)o Frequency (the higher the worse)

Δ9.2℃

Example of heat rise on FR-4 PCB• Vin : 9VDC• Vout : 2.5VDC• Imax : 3A• Fswitching : 500 kHz• Exp. Vripple : 70mV @ 2A• PN: MPXV1D0630L1R0

(1µH / 6x6mm / 9A rated / 7.1mΩ)

Saturation differences Ferrite vs. Metal

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Rated Current: Isat

o Influence of Rippleo Example @ 1.5A

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Rated Current: Isat

o Influence of Ripple with Soft Saturation Inductoro Example @ 1.5A

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E2DI strategy for a wide application range

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• To make it as easy as possible we adapt to an industrial known footprint

• Quick samples are available on online distribution channels or via our inside & outside sales team (sample engineering kits will follow)

• Datasheet link https://content.kemet.com/datasheets/KEM_L9013_MPXV.pdf

• Generic and full PPAP available on request & full AEC-Q200 qualified• IATF 16949 qualified plants - certificates and plant audits on request

Roadmap / What comes next ?*i.e. ◇5 5x5mm PCB footprint

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CURRENT 2020 2021 2022MPCMPLC

SeriesMetal CompositePower Inductorfor PC/GPU,GFX

Metal CompositePower Inductorfor Automotive

MPXSeries

Metal CompositePower InductorVishay – Bourns

cross

Jun (102parts)◇5◇6◇8

★

Oct (99parts)◇10◇12◇17◇22

◇6 ◇10 ◇10 ◇12

MPLCV & MPCVSeries

Industrialgrade

automotivegrade

(custom & special)

automotivegrade (series)

MPXVSeries

Mar (216 parts)◇5,◇6, ◇8, ◇10◇12, ◇17, ◇22

Op temp ≤ 155 ˚C

UD

★

Op temp ≤ 180 ˚C

MPEVSeries

Oct (tbd)

Industry

Automotive & Transportation

Automotive & Transportation

focus ◇6,◇10

focus

Op temp ≤ 155 ˚C

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Conclusion & questions- Metcom technolgy is key for automotive applications- KEMET offers more than 200 PN´s in AECQ200 grade- MPXV series is matching and exceeding industry performance- KEMET MSA BG is ready for customer designs