TDA2005_98 データシートの表示（PDF） - STMicroelectronics
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TDA2005_98 Datasheet PDF : 20 Pages
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TDA2005
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
− 2 VCEsat
IO max
=
14.4 −4
3.5
=
2.97Ω
The voltage gain of the bridge configurationisgiven
by (see Figure 34) :
GV
=
V0
V1
=
1
+
R1
R2 ⋅ R4
+
R3
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
R1
R2
Gv (dB)
40
50
R1 (Ω)
1000
1000
R2 = R4 (Ω)
39
12
R3 (Ω)
2000
2000
Figure 6 : Bridge Configuration
STEREO AMPLIFIER APPLICATION (TDA2005S)
Figure 7 : Typical Application Circuit
6/20
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