TDA2040 [STMICROELECTRONICS]
20W Hi-Fi AUDIO POWER AMPLIFIER; 20W高保真音频功率放大器
| 型号： | TDA2040 |
| 厂家： | 
ST |
| 描述： | 20W Hi-Fi AUDIO POWER AMPLIFIER |
| 文件： | 总13页 (文件大小：393K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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-
maticallylimiting the dissipatedpowersoas to keep
the working point of the output transistors within
their safe operating area. A thermal shut-down
system is also included.
PENTAWATT
ORDERING NUMBER : TDA2040V
TEST CIRCUIT
1/13
December 1995
TDA2040
SCHEMATIC DIAGRAM
PIN CONNECTION
THERMAL DATA
Symbol
Parameter
Thermal Resistance Junction-case
Value
Unit
Rth j-case
Max.
3
°C/W
2/13
TDA2040
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
Vs
Vi
Supply Voltage
± 20
V
Input Voltage
Vs
Vi
Differential Input Voltage
± 15
V
A
Io
Output Peak Current (internally limited)
Power Dissipation at Tcase = 75 °C
Storage and Junction Temperature
4
25
Ptot
Tstg, Tj
W
°C
– 40 to + 150
ELECTRICAL CHARACTERISTICS
(refer to the test circuit, VS = ± 16V, Tamb = 25oC unless otherwise specified)
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
Vs
Id
Supply Voltage
± 2.5
± 20
V
Quiescent Drain Current
Vs = ± 4.5V
30
100
mA
mA
Vs = ± 20V
Vs = ± 20V
Vs = ± 20V
45
0.3
± 2
Ib
Input Bias Current
Input Offset Voltage
Input Offset Current
Output Power
1
µA
Vos
Ios
Po
± 20
mV
± 200 nA
d = 0.5%, Tcase = 60°C
W
f = 1kHz
RL = 4Ω
RL = 8Ω
RL = 4Ω
20
15
22
12
18
f = 15kHz
Po = 1W, RL = 4Ω
f = 1kHz
BW
Gv
Gv
d
Power Bandwidth
100
80
kHz
dB
Open Loop Voltage Gain
Closed Loop Voltage Gain
Total Harmonic Distortion
f = 1kHz
29.5
30
30.5
dB
%
Po = 0.1 to 10W, RL = 4Ω
f = 40 to 15000Hz
f = 1kHz
0.08
0.03
eN
iN
Input Noise Voltage
Input Noise Current
B = Curve A
2
3
µV
µV
B = 22Hz to 22kHz
10
B = Curve A
B = 22Hz to 22kHz
50
80
pA
200
Ri
Input Resistance (pin 1)
Supply Voltage Rejection
0.5
40
5
MΩ
SVR
RL = 4Ω, Rg = 22kΩ, Gv = 30dB
f = 100Hz, Vripple = 0.5VRMS
50
dB
η
Efficiency
f = 1kHz
%
Po = 12W
Po = 22W
RL = 8 Ω
RL = 4 Ω
66
63
Tj
Thermal Shut-down Junction Temperature
145
°C
3/13
TDA2040
Figure 1 : Output Power versus Supply Voltage
Figure 2 : Output Power versus Supply Voltage
Figure 3 : Output Power versus Supply Voltage
Figure 4 : Distortion versus Frequency
Figure 5 : Supply Voltage Rejection versus
Figure 6 : Supply Voltage Rejection versus
Frequency
Voltage Gain
4/13
TDA2040
Figure 7 : Quiescent Drain Current versus
Figure 8 : Open Loop Gain versus Frequency
Supply Voltage
Figure 9 : Power Dissipation versus Output
Power
5/13
TDA2040
Figure 10 : Amplifier with Split Power Supply
Figure 11 : P.C. Board and Components Layout for the Circuit of Figure 10 (1:1 scale)
6/13
TDA2040
Figure 12 : Amplifier with Split Power Supply (see Note)
Note : In this case of highly inductive loads protection diodes may be necessary.
Figure 13 : P.C. Board and Components Layout for the Circuit of Figure 12 (1:1 scale)
7/13
TDA2040
Figure 14 : 30W Bridge Amplifier with Split Power Supply
Figure 15 : P.C. Board and Components Layout for the Circuit of Figure 14 (1:1 scale)
8/13
TDA2040
Figure 16 : Two Way Hi-Fi System with Active Crossover
Figure 17 : P.C. Boardand Components Layout for the Circuit of Figure 16 (1:1 scale)
9/13
TDA2040
Figure 18 : Frequency Response
Figure 19 : Power Distribution versus Frequency
MULTIWAY SPEAKER SYSTEMS AND ACTIVE
BOXES
power amplifier is provided for each drive unit. This
makes it particularly interesting and economically
sound to use monolithic power amplifiers. In some
applications, complex filters are not really neces-
sary and simple RC low-pass and high-pass net-
works (6dB/octave) can be recommended.
The results obtained are excellent because this is
the best type of audio filter and the only one free
from phase and transient distortion.
Multiway loudspeaker systems provide the best
possible acoustic performance since each loud-
speaker is specially designed and optimized to
handle a limited range of frequencies. Commonly,
these loudspeaker systems divide the audio spec-
trum into two, three or four bands.
To maintaina flat frequencyresponseover theHi-Fi
audio range the bands covered by each loud-
speaker must overlap slightly. Imbalance between
the loudspeakers produces unacceptable results
therefore it is important to ensure that each unit
generates the correct amount of acoustic energy
for its segment of the audio spectrum. In this re-
spect it is also important to know the energy distri-
bution of the music spectrum determine the cutoff
frequenciesof the crossover filters (see Figure 19).
As an example, a 100W three-way system with
crossover frequencies of 400Hz and 3kHz would
require 50W for the woofer, 35W for the midrange
unit and 15W for the tweeter.
The rather poor out of band attenuation of single
RC filters means that the loudspeaker must oper-
ate linearly well beyond the crossoverfrequency to
avoid distortion.
A more effective solution, named ”Active Power
Filter” by SGS is shown in Figure 20.
Figure 20 : Active Power Filter
Both active and passive filters can be used for
crossovers but today active filters cost significantly
less than a good passive filter using air-cored in-
ductorsandnon-electrolyticcapacitors. Inaddition,
active filters do not suffer from the typical defects
of passive filters :
The proposed circuit can realize combined power
amplifiers and 12dB/octave or 18dB/octave high-
pass or low-pass filters.
- power loss
- increased impedance seen by the loudspeaker
(lower damping)
- difficulty of precise design due to variable loud-
speaker impedance
In practice, at the input pins of the amplifier two
equal and in-phase voltages are available, as re-
quired for the active filter operation.
Obviously, active crossovers can only be used if a
10/13
TDA2040
The impedanceat thepin (-)is of theorder of 100Ω,
while that of the pin (+) is very high, which is also
what was wanted.
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.
C1 = C2 = C3
R1
R2
R3
22 nF
8.2 kΩ
5.6 kΩ
33 kΩ
The component values calculated for fc = 900Hz
using a Bessel 3rd order Sallen and Key structure
are :
Assembly Suggestion
In theblock diagram of Figure 21is representedan
active loudspeakersystem 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.
No electrical isolation is neededbetween 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.
A modern subwoofer/midrange/tweetersolution is
used.
Figure 21 : High Power Active LoudspeakerSystem using TDA2030A and TDA2040
Recom.
Value
Larger than
Recommended Value
Smaller than
Recommended Value
Comp.
Purpose
R1
R2
R3
R4
22kΩ
680Ω
22kΩ
4.7Ω
Non inverting input biasing Increase of input impedance
Decrease of input impedance
Increase of gain
Closed loop gain setting
Closed loop gain setting
Frequency stability
Decrease of gain (*)
Increase of gain
Decrease of gain (*)
Danger of oscillation at high
frequencies with inductive loads
C1
C2
1µF
22µF
0.1µF
Input DC decoupling
Inverting DC decoupling
Supply voltage bypass
Supply voltage bypass
Frequency stability
Increase of low frequencies cut-off
Increase of low frequencies cut-off
Danger of oscillation
C3, C4
C5, C6 220µF
C7 0.1µF
Danger of oscillation
Danger of oscillation
(*) The value of closed loop gain must be higher than 24dB
11/13
TDA2040
PENTAWATT PACKAGE MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
4.8
MIN.
MAX.
0.189
0.054
0.110
0.053
0.022
0.041
0.055
0.142
0.276
0.409
0.409
A
C
1.37
2.8
D
2.4
1.2
0.35
0.8
1
0.094
0.047
0.014
0.031
0.039
0.126
0.260
D1
E
1.35
0.55
1.05
1.4
F
F1
G
3.4
6.8
0.134
0.268
G1
H2
H3
L
10.4
10.4
10.05
0.396
17.85
15.75
21.4
0.703
0.620
0.843
0.886
L1
L2
L3
L5
L6
L7
M
22.5
2.6
15.1
6
3
0.102
0.594
0.236
0.118
0.622
0.260
15.8
6.6
4.5
4
0.177
0.157
M1
Dia
3.65
3.85
0.144
0.152
L
L1
L2
L3
L5
Dia.
L7
L6
12/13
TDA2040
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwiseunder any patent or patent rights of SGS-THOMSON Microelectronics. Specifications men-
tioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without ex-
press written approval of SGS-THOMSON Microelectronics.
1996 SGS-THOMSON Microelectronics All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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13/13
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