1 Reference design specifications
The target specifications of the STEVAL-WBC86TX evaluation board are as follows:
Table 1. STEVAL-WBC86TX target specifications
Parameter Description
Qi compatibility Qi 1.2.4 compatible
Tx application PCB area 40 mm x 24 mm
Tx coil specifications
Inductance 6.3 uH, DCR 20 mOhm, ACR 20 mOhm @ 100 kHz, dimensions 53.3
mm x 53.3 mm x 6 mm
Qi Tx topology A11a
Input voltage (Vin) 5 V
Input current (Iin) 1.5 A
Host MCU
STM32 used as a reference, the reference I2C driver can be ported to any other
MCU family
USB-to-I2C converter FT260, embedded in the evaluation board
Efficiency
77.6 % (5 W operation) with STEVAL-WLC38RX
81 % (peak efficiency) with STEVAL-WLC38RX at 3 W
Applicable charging gap between Tx
and Rx coils
(z-distance)
3 – 13 mm (5 W output) with STEVAL-WLC38RX receiver,
maximum 16 mm – stable communication without output enabled
Operational modes Transmitter only
UM3161
Reference design specifications
UM3161 - Rev 1
page 3/78
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