8

Bridge application

Another application suggestion is the bridge configuration, where two TDA7296 are used, as shown by the

schematic diagram.

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 performance with limited supply voltage level

•

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

The characteristics shown by Figure 21. Distortion vs. output power (Rl= 16 Ω) and Figure 22. Distortion vs.

output power ( VS= ± 18 V) , measured with loads respectively 8 Ω and 16 Ω.

With Rl= 8 Ω, VS = ±18 V the maximum output power obtainable is 60 W, while with Rl=16 Ω, Vs = ±24 V the

maximum Pout is 60 W.

Figure 19. Bridge application circuit

22K

0.56µF

2200µF

0.22µF

+

-

22µF

22K

680

22K

3

1

4

13

7

+Vs

Vi

5

1

8

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

13

7

D93AU015A

TDA7296

Bridge application

DS0179 - Rev 11

page 15/23