TDA2030A

Power supply

Doc ID 1459 Rev 2

17/23

5

Power supply

Using a monolithic audio amplifier with non-regulated supply voltage, it is important to

design the power supply correctly. For any operation it must provide a supply voltage less

than the maximum value fixed by the IC breakdown voltage.

It is essential to take into account all the operating conditions, in particular mains

fluctuations and supply voltage variations with and without load. The TDA2030A

(VS max = 44 V) is particularly suitable for substitution of the standard IC power amplifiers

(with VS max = 36 V) for more reliable applications. An example, using a simple full-wave

rectifier followed by a capacitor filter, is shown in Table 6 and in the diagram of Figure 30.

Figure 30.

DC characteristics of 50 W non-regulated supply

Table 6.

DC characteristics of 50 W non-regulated supply

A regulated supply is not usually used for the power output stages because its dimensioning

must be done taking into account the power to supply in the signal peaks. They are only a

small percentage of the total music signal, with consequently large overdimensioning of the

circuit.

Mains

(220 V)

Secondary

voltage

DC output voltage (Vo)

Io = 0

Io = 0.1 A

Io = 1 A

+ 20%

28.8 V

43.2 V

42 V

37.5 V

+ 15%

27.6 V

41.4 V

40.3 V

35.8 V

+ 10%

26.4 V

39.6 V

38.5 V

34.2 V

–

24 V

36.2 V

35 V

31 V

– 10%

21.6 V

32.4 V

31.5 V

27.8 V

– 15%

20.4 V

30.6 V

29.8 V

26 V

– 20%

19.2 V

28.8 V

28 V

24.3 V

Obsolete

Product(s)

- Obsolete

Product(s)