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PDF TDA2040V Data sheet ( Hoja de datos )
| Número de pieza | TDA2040V | |
| Descripción | 20W Hi-Fi AUDIO POWER AMPLIFIER | |
| Fabricantes | ST Microelectronics | |
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TDA2040
20W Hi-Fi AUDIO POWER AMPLIFIER
DESCRIPTION
The TDA2040 is a monolithic integrated circuit in
Pentawatt ® package,intended for use as an audio
class AB amplifier. Typically it provides 22W output
power (d = 0.5%) at Vs = 32V/4Ω . The TDA2040
provides high output current and has very low
harmonic and cross-over distortion. Further the
device incorporates a patented short circuit protec-
tion system comprising an arrangement for auto-
matically limiting the dissipated power so as to keep
the working point of the output transistors within
their safe operating area. A thermal shut-down
system is also included.
TEST CIRCUIT
PENTAWATT
ORDERING NUMBER : TDA2040V
December 1995
1/13
1 page  
Figure 7 : Quiescent Drain Current versus
Supply Voltage
TDA2040
Figure 8 : Open Loop Gain versus Frequency
Figure 9 : Power Dissipation versus Output
Power
5/13
5 Page 
TDA2040
The impedance at the pin (-) is of the order of 100Ω,
while that of the pin (+) is very high, which is also
what was wanted.
C1 = C2 = C3
22 nF
R1
8.2 kΩ
R2
5.6 kΩ
R3
33 kΩ
The component values calculated for fc = 900Hz
using a Bessel 3rd order Sallen and Key structure
are :
In the block diagram of Figure 21 is represented an
active loudspeaker system completely realized us-
ing power integrated circuit, rather than the tradi-
tional discrete transistors on hybrids, very high
quality is obtained by driving the audio spectrum
into three bands using active crossovers
(TDA2320A) and a separate amplifier and loud-
speakers for each band.
A modern subwoofer/midrange/tweetersolution is
used.
PRATICAL CONSIDERATION
Printed Circuit Board
The layout shown in Figure 11 should be adopted
by the designers. If different layouts are used, the
ground points of input 1 and input 2 must be well
decoupled from the gorund return of the output in
which a high current flows.
Assembly Suggestion
No electrical isolation is needed between the pack-
age and the heatsink with single supply voltage
configuration.
Application Suggestions
The recommended values of the components are
those shown on application circuit of Fig. 10. Dif-
ferent values can be used. The following table can
help the designer.
Figure 21 : High Power Active Loudspeaker System using TDA2030A and TDA2040
Comp.
R1
R2
R3
R4
C1
C2
C3, C4
C5, C6
C7
Recom.
Value
22kΩ
680Ω
22kΩ
4.7Ω
1µF
22µF
0.1µF
220µF
0.1µF
Purpose
Non inverting input biasing
Closed loop gain setting
Closed loop gain setting
Frequency stability
Input DC decoupling
Inverting DC decoupling
Supply voltage bypass
Supply voltage bypass
Frequency stability
Larger than
Recommended Value
Increase of input impedance
Decrease of gain (*)
Increase of gain
Danger of oscillation at high
frequencies with inductive loads
(*) The value of closed loop gain must be higher than 24dB
Smaller than
Recommended Value
Decrease of input impedance
Increase of gain
Decrease of gain (*)
Increase of low frequencies cut-off
Increase of low frequencies cut-off
Danger of oscillation
Danger of oscillation
Danger of oscillation
11/13
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