WEEK 5

Comparison Study of audio amplifier performances using Class AB, B and D topologies in portable audio devices.

In this week, after doing some discussion with my supervisor, I found the suitable circuit diagram for Class D audio amplifier. This Class D using the IC TDA7481. This IC is an audio class D amplifier assembled in Multiwatt 15 package specially designed for high efficiency applications mainly for TV and Home Stereo sets, capable of 18W power at load of 8w or 4w and a total harmonic distorsion of 10%. Requires a split-supply (max 20V).

The IC has build -in-stand-by and mute feature, overvoltage protection, short circuit protection and thermal overload protection.

Figure 8: schematic diagram

Figure 9: pinout - TDA7480