2 Reference design specifications
The target specifications of the STEVAL-WBC2TX70 evaluation board are given in the following table.
Table 1. Reference design specifications
Parameter Description
Qi compatibility Qi 1.3 compatible
Tx application PCB area 68 mm x 53 mm
Tx coil specifications Inductance 10 µH, DCR 50 mΩ, @ 100 kHz, dimensions 53 mm x 53 mm x 4.5 mm
Qi Tx topology MP-A2
Input voltage (Vin)
5-20 V
(1)
Input current (Iin) <6 A
Programming/diagnostics
STLINK-V3MINI bridge
STLINK-V3MINIE bridge
STLINK-V3 bridge
Any standard UART bridge supporting 115200 bps
Efficiency 86.5% with STEVAL-WBC99RX at 70 W
Applicable charging gap between Tx
and Rx coils(z-distance)
4 mm - 70 W STSC operation with STEVAL-WBC99RX. On USB PD input.
4–15 mm (70 W output) with STEVAL-WBC99RX. On 20 V fixed voltage to barrel jack.
Maximum 20 mm. On 20 V fixed voltage to barrel jack. Reduced maximum output
power.
Operational modes Transmitter only
Ambient temperature 25 °C
1. The default configuration allows operation from USB PD power adapter, fast charge adapter, or from barrel jack connector
supplied by 5-12.5 V. To operate from a barrel jack at a higher input voltage, the configuration must be changed accordingly.
Qi BPP and EPP compatibility is fully supported only in default mode. The configuration and its changes are described later
in this document.
UM3286
Reference design specifications
UM3286 - Rev 1
page 3/84
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