Figure 4. Full bridge inverter

Typical Operating Frequency range of the full-bridge inverter is op = 120 … 148 kHz , duty cycle range 10% to

50%.

Primary Coil and Shielding has a self-inductance P = 6.3±10% μH.

The value of the series capacitance is P =0.4±5% μF.

The input voltage to the full-bridge inverter is 5±5% V.

5.3

ASK communication

Robust and reliable in-band ASK communication is critical to the operation of any Qi compliant devices.

Using ASK modulation, the receiver sends Control Error Packets (CEP) to tune the operating point to match load

requirements.

The coil signal is demodulated using a circuit shown below and fed to the VS pin of STWBC86.

Figure 5. ASK demodulation filter circuit

10K

D

5.1K

220K

4.7nF

AC1

VS

22nF

680pF

STWBC86

ASK communication

DS14079 - Rev 1

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