11

Bridge application

Another application suggestion is the BRIDGE configuration, where two TDA7294 are used, as shown by the

schematic diagram of Figure 27.

In this application, the value of the load must not be lower than 8 Ω for dissipation and current capability reasons.

A suitable field of application includes HI-FI/TV subwoofers realizations.

The main advantages offered by this solution are:

- High power performances with limited supply voltage level.

- Considerably high output power even with high load values (i.e. 16 Ω).

The characteristics shown by Figure 29 and Figure 30, measured with loads respectively 8 Ω and 16 Ω.

With Rl = 8 Ω, Vs = ± 25 V the maximum output power obtainable is 150 W, while with Rl = 16 Ω, Vs = ± 35 V the

maximum Pout is 170 W.

Figure 27. Bridge application circuit

22K

0.56µF

2200µF

0.22µF

TDA7294

+

-

22µF

22K

680

22K

3

1

4

13

7

+Vs

Vi

8

15

2

14

6

10

9

+

-

3

0.56µF

22K

1

4

2

14

6

22µF

22K

680

10

9

22µF

15

8

-Vs

2200µF

0.22µF

22µF

20K

10K

30K

1N4148

ST-BY/MUTE

TDA7294

13

7

TDA7294

Bridge application

DS0013 - Rev 8

page 22/31