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TDA2005 Scheda tecnica(PDF) 6 Page - STMicroelectronics

Il numero della parte TDA2005
Spiegazioni elettronici  20W BRIDGE AMPLIFIER FOR CAR RADIO
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA2005 Scheda tecnica(HTML) 6 Page - STMicroelectronics

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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 =
VS
− 2VCEsat
IOmax
=
14.4
4
3.5
= 2.97
The voltage gain of the bridge configurationis given
by (see Figure 34) :
GV =
V0
V1
=1 +
R1
R2
R4
R2 + R4
+
R3
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
R1
R2
Gv (dB)
R1 (
Ω)R2 =R4 (Ω)R3 (Ω)
40
50
1000
1000
39
12
2000
2000
Figure 6 : Bridge Configuration
Figure 7 : Typical Application Circuit
STEREO AMPLIFIER APPLICATION (TDA2005S)
TDA2005
6/20


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