AN3385

PCB layout

Doc ID 018702 Rev 1

9/15

3.2

Design guidelines for PCB schematic and layout

3.2.1

Dumping network

The capacitor is mainly intended for high inductive loads and for common-mode noise

attenuation.

Figure 7.

Dumping network

3.2.2

Main filter

The main filter is an LC Butterworth based filter. The cutoff frequency must be chosen

between the upper limit of the audio band (

∼20 kHz) and the carrier frequency (310 kHz).

Figure 8.

Main filter

AM045281v1

C28

100nF

C24

100nF

Table 5.

Recommended values

8

Ω

6

Ω

33 µH

22 µH

220 nF

220 nF

AM045282v1