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Which coil to use with wireless charging

Other Parts Discussed in Thread: TIDA-00318

Hi guys,

I'm trying to make Qİ compliant wireless charger for low power. I'm using the link below.

www.ti.com/.../tida-00318;tisearch=Search-EN-Everything#Technical Documents

The problem is I don't know which coil to use for this experiment. For test results it uses a TDK WR222230 but I cannot find it anywhere. Can someone offer me a small coil that can easly fit 4x4 cm box ?