DocID026803 Rev 1

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AN4569

2.1-channel applications using two devices

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The snubber network is a part of schematic that is layout dependent. The values shown in

the schematic (R = 22 ohm, C = 330 pF) represent the best solution for the ST demo board.

In Figure 15 there are two types of snubber: BTL and single-ended. It is possible to select a

differential or single-ended snubber according to the power dissipation on the resistor and

within layout constraints.

Differential snubber

The power on this network is dependent on the power supply, frequency and capacitor value

using the following formula:

The power must be dissipated on the series resistor.

Single-ended snubber

This type of snubber is used to increase the efficiency or, otherwise, must be used if the

output configuration is single-ended. For a single-ended snubber the power on the network

is given in the equation below.

Equation 4

2.1 channels, two devices - power on snubber

Cf







2



=

Cf





2



=



=