BRIDGE APPLICATION

Another application suggestion is the BRIDGE

configuration, where two TDA7294 are used, as

shown by the schematic diagram of figure 25.

In this application, the value of the load must not

be lower than 8 Ohm 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 Ohm).

The characteristics shown by figures 27 and 28,

measured with loads respectively 8 Ohm and 16

Ohm.

With Rl= 8 Ohm, Vs =

±25V the maximum output

power obtainable is 150 W, while with Rl=16

Ohm, Vs =

±35V the maximum Pout is 170 W.

22K

0.56

µF

2200

µF

0.22

µF

TDA7294

+

-

22

µF

22K

680

22K

3

1

4

13

7

+Vs

Vi

8

15

2

14

6

10

9

+

-

3

0.56

µF

22K

1

4

2

14

6

22

µF

22K

680

10

9

22

µF

15

8

-Vs

2200

µF

0.22

µF

22

µF

20K

10K

30K

1N4148

ST-BY/MUTE

TDA7294

13

7

D93AU015A

Figure 25: Bridge Application Circuit

TDA7294

13/16