Figure 63. Efficiency curve in Z axis
15%
25%
35%
45%
55%
65%
75%
85%
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Efficiency [%]
Iout [A]
STEVAL-WBC86TX + STEVAL-WLC38RX (Z-axis)
3 mm gap 8 mm gap 10 mm gap 13 mm gap
Z-distance of 3 mm is a typical value for most applications (2 mm on the TX side + 1 mm on the RX side).
Clearly, the transmitter can deliver sufficient power even with 13 mm charging gap. However, efficiency is
decreasing rapidly with increasing charging gap. Therefore, minimizing Z-distance whenever possible is
recommended.
5.2.4 Thermal performance
Thermal performance of the board with a 5 W load (5 V/1 A on the RX side) after 5 minutes of continuous
operation.
Figure 64. Thermal performance
UM3161
Typical performance characteristics
UM3161 - Rev 1
page 49/78
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