ST STEVAL-WLC38RX - Reference Design Specifications; Table 1. Reference Design Specifications

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2 Reference design specifications

Target specifications of STEVAL-WLC38RX evaluation board are as follows:

Table 1. reference design specifications

Parameter Description

Qi compatibility Qi 1.3 BPP and EPP protocol

Rx application PCB area 24 mm x 34 mm

Rx coil specifications

Inductance 8 uH, DCR 190 mΩ, ACR 225 mΩ

Dimensions 57 mm x 57 mm x 0.42 mm (LD81FP008-1H)

Output voltage (Vout, continuous

operation)

5 V Baseline Power Profile / 9 V Extended Power Profile

Output current (Iout, Load) Recommended current load range is 0.1 – 1 A

Host MCU

STM32 used as a reference, the reference I

C driver can be ported to any other

MCU family

USB-to-I

C converter

Embedded in the evaluation board

Efficiency

77.6% (5 W operation) with STEVAL-WBC86TX

81% (peak efficiency) with STEVAL-WBC86TX at 3 W

Applicable charging gap between Tx

and Rx coils(z-distance)

3 – 13 mm (5 W output) with STEVAL-WBC86TX transmitter,

maximum 16 mm – stable communication without output enabled

Misalignment between Tx and Rx coils

(x-y offset from the center)

12 mm for 5 W output, 18 mm for stable communication without output enabled

UM3154

Reference design specifications

UM3154 - Rev 2

page 3/81