AN4189

Design guidelines for PCB schematic and layout

Doc ID 023809 Rev 1

19/23

Place snubber filters for high-frequency spike protection on the output circuit.

Figure 28.

Snubber filters for high-frequency spikes

Figure 29.

Common-mode and differential snubber placement

A strong spike, which could be sufficient to damage the device, could occur if there is

significant distance between the snubber network and the pins. The recommended distance

between the snubber network and the IC pins is within 3 mm, which takes into consideration

the width of the copper wire.

Snubber circuit for spike on the PWM

as close as possible to IC pins, also

close to the minus and plus of each

channel.