UTCTDA2030 LINEAR INTEGRATED CIRCUIT

9

QW-R107-004,B

The components values calculated for fc=900Hz using a Bessel 3rd Sallen and Key structure are:

C1=C2=C3=22nF,R1=8.2K

Ω,R2=5.6KΩ,R3=33KΩ.

Using this type of crossover filter, a complete 3-way 60W active loudspeaker system is shown in Fig. 20.

It employs 2nd order Buttherworth filter with the crossover frequencies equal to 300Hz and 3kHz.

The midrange section consistors of two filters a high pass circuit followed by a low pass network. With Vs=36V the

output power delivered to the woofer is 25W at d=0.06%( 30W at d=0.5%).The power delivered to the midrange and

the tweeter can be optimized in the design phase taking in account the loudspeaker efficiency and

impedance(RL=4

Ω to 8Ω).

It is quite common that midrange and tweeter speakers have an efficiency 3dB higher than woofers.

1

2

5

4

3

UTC

TDA2030

1

2

5

4

3

UTC

TDA2030

1

2

5

4

3

UTC

TDA2030

100

µF

1

µF

0.1

µF

0.1

µF

0.22

µF

Vs+

100

µF

0.22

µF

0.1

µF

0.1

µF

47

µF

100

µF

220

µF

2200

µF

BD908

BD907

22k

Ω

22k

Ω

22k

Ω

22k

Ω

2.2k

Ω

Vs+

1N4001

1N4001

1N4001

2.2k

Ω

Vs+

Vs+

IN

Woofer

Midrange

Tweeter

High-pass

3kHz

High-pass

3kHz

Band-pass

300Hz to 3kHz

Low-pass

300Hz

1N4001