DocID026803 Rev 1

27/29

AN4569

Conclusion

29

5

Conclusion

For 2.1-channel applications, the better choice in terms of audio quality is to use two

different ICs (one in stereo BTL mode and the other one configured in mono BTL).

If two ICs are selected, the mono BTL device must use an additional capacitor between the

GND_REG pin and GND plane.

If two ICs are selected, it is possible configure the output filter as filter-lite. Using a 2.1-

channel configuration with only one IC, all PWM outputs are configured in binary modulation

and for this reason it is not possible to use a filter-lite solution.

If it is mandatory to use all SMD components in the whole application (for example in TV

applications due to thickness constraints), the only possibility is to use two ICs because for

Left and Right channels it is mandatory to use two electrolytic capacitors for the channel.