TDA2005M datasheet(6/20 Pages) STMICROELECTRONICS

6 / 20 page

Voltage and current swings are twice for a bridge

amplifier in comparison with single ended amplifier.

In order words, with the same RL the bridge con-

figuration can deliver an output power that is four

times the output power of a single ended amplifier,

while, with the same max output current the bridge

configuration can deliver an output power that is

twice the output power of a single ended amplifier.

Core must be taken when selecting VS and RL in

order to avoid an output peak current above the

absolute maximum rating.

From the expression for IOmax, assuming VS

= 14.4V and VCE sat = 2V, the minimum load that

can be driven by TDA2005 in bridge configuration

is :

RL min =

− 2VCEsat

IOmax

14.4

−4

3.5

= 2.97

Ω

The voltage gain of the bridge configurationis given

by (see Figure 34) :

GV =

=1 +







⋅ R4

R2 + R4







For sufficiently high gains (40 to 50dB) it is possible

to put R2 =R4 and R3 =2 R1, simplifing the formula

in :

GV =4

Gv (dB)

R1 (

Ω)R2 =R4 (Ω)R3 (Ω)

1000

2000

Figure 6 : Bridge Configuration

Figure 7 : Typical Application Circuit

STEREO AMPLIFIER APPLICATION (TDA2005S)

TDA2005

6/20

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