LDC1101 4 Layer 2x2 Parallel

Jan Rosenfelder

Other Parts Discussed in Thread: LDC1101EVM

Hello,
i designed a PCB coil with following parameter:

Layer 2x2 Parallel
Sensor capacitance C: 300,0pF
Turns N: 25
Outer diameter of the inductor dout: 15,50mm
spacing between traces: S    4,000 mil
width of trace : w 4,000 mil
PCB thickness between 1st layer and 2nd layer    h12:   0,300 mm
PCB thickness between 2nd layer and 3rd layer    h23:    0,760 mm
PCB thickness between 3rd layer and 4th layer    h34:    0,300 mm
Self inductance per layer L: 6,818µH
Copper thicknesst: 1,000 oz-Cu

How can i find out the Total Inductance & Q factor of this coil? There is no formula in SNOA930.
And the Excel-Tool slyc137 has only a calculator for Serialcoil.

Best regards,
Jan

over 9 years ago

0 Ben Kasemsadeh over 9 years ago

TI__Genius 13650 points

Hello Jan,
I'm afraid we do not have a model for such a PCB coil.

0 Jan Rosenfelder over 9 years ago in reply to Ben Kasemsadeh

Prodigy 90 points

Hello Ben,

the LDC1101EVM have a 2x2 Parallel Coil and I have the same problem to find out the formula for this inductivity.
The EVM Coil has 7.7 µH (SNOU137), but how can I calculate it?

Best regards,
Jan

0 Ben Kasemsadeh over 9 years ago in reply to Jan Rosenfelder

TI__Genius 13650 points

Hi Jan,
calculating the parallel coil arrangement is more complex, and we don't currently have a simulation model. The EVM coil was designed using a rough estimate based on a standard coil as per Webench or the LDC tools spreadsheet. The results you see are characterization results; we characterized the coil with an impedance analyzer.

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LDC1101 4 Layer 2x2 Parallel