TDA2030A 18W Hi-Fi AMPLIFIER AND 35W DRIVER

TDA2030A 18W Hi-Fi AMPLIFIER AND 35W DRIVER
TDA2030A
®
18W Hi-Fi AMPLIFIER AND 35W DRIVER
DESCRIPTION
The TDA2030A is a monolithic IC in Pentawatt 
package intended for use as low frequency class
AB amplifier.
With VS max = 44V it is particularly suited for more
reliable applications without regulated supply and
for 35W driver circuits using low-cost complementary pairs.
The TDA2030A provides high output current and
has very low harmonic and cross-over distortion.
Further the device incorporates a short circuit protection system comprising an arrangement for
automatically limiting the dissipated power so as to
keep the working point of the output transistors
within their safe operating area. A conventional
thermal shut-down system is also included.
PENTAWATT
ORDERING NUMBERS : TDA2030AH
TDA2030AV
TYPICAL APPLICATION
October 2000
1/15
TDA2030A
PIN CONNECTION (Top view)
TEST CIRCUIT
THERMAL DATA
Symbol
Rth (j-case)
2/15
Parameter
Thermal Resistance Junction-case
Max
Value
Unit
3
°C/W
TDA2030A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
± 22
V
Vs
Supply Voltage
Vi
Input Voltage
Vi
Differential Input Voltage
± 15
V
Io
Peak Output Current (internally limited)
3.5
A
Ptot
Total Power Dissipation at Tcase = 90 °C
Tstg, Tj
Vs
Storage and Junction Temperature
20
W
– 40 to + 150
°C
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, VS = ± 16V, Tamb = 25oC unless otherwise specified)
Symbol
Parameter
Vs
Supply Voltage
Id
Quiescent Drain Current
Ib
Test Conditions
Min.
Typ.
±6
50
Max.
Unit
± 22
V
80
mA
Input Bias Current
VS = ± 22V
0.2
2
µA
Vos
Input Offset Voltage
VS = ± 22V
±2
± 20
mV
Ios
Input Offset Current
± 20
± 200
nA
PO
Output Power
W
d = 0.5%, Gv = 26dB
f = 40 to 15000Hz
VS = ± 19V
RL = 4Ω
RL = 8Ω
RL = 8Ω
15
10
13
18
12
16
100
kHz
8
V/µsec
BW
Power Bandwidth
SR
Slew Rate
Gv
Open Loop Voltage Gain
f = 1kHz
Gv
Closed Loop Voltage Gain
f = 1kHz
d
Total Harmonic Distortion
RL = 4Ω
Po = 0.1 to 14W
f = 40 to 15 000Hz
f = 1kHz
Po = 0.1 to 9W, f = 40 to 15 000Hz
RL = 8Ω
0.08
0.03
%
%
0.5
%
Po = 15W
RL = 4Ω
80
25.5
26
dB
26.5
dB
d2
Second Order CCIF Intermodulation
Distortion
PO = 4W, f2 – f1 = 1kHz, RL = 4Ω
0.03
%
d3
Third Order CCIF Intermodulation
Distortion
f1 = 14kHz, f2 = 15kHz
2f1 – f2 = 13kHz
0.08
%
eN
Input Noise Voltage
B = Curve A
B = 22Hz to 22kHz
2
3
10
µV
µV
B = Curve A
B = 22Hz to 22kHz
50
80
200
pA
pA
RL = 4Ω, Rg = 10kΩ, B = Curve A
PO = 15W
PO = 1W
106
94
dB
dB
iN
S/N
Ri
SVR
Tj
Input Noise Current
Signal to Noise Ratio
Input Resistance (pin 1)
Supply Voltage Rejection
Thermal Shut-down Junction
Temperature
(open loop) f = 1kHz
RL = 4Ω, Rg = 22kΩ
Gv = 26dB, f = 100 Hz
0.5
5
MΩ
54
dB
145
°C
3/15
TDA2030A
Figure 1 : Single Supply Amplifier
Figure 2 : Open Loop-frequency Response
Figure 4 :
4/15
Total Harmonic Distortion versus
Output Power (test using rise filters)
Figure 3 : Output Power versus Supply Voltage
Figure 5 : Two Tone CCIF Intremodulation
Distortion
TDA2030A
Figure 6 : Large Signal Frequency Response
Figure 7 : Maximum Allowable Power Dissipation
versus Ambient Temperature
Figure 8 : Output Power versus Supply Voltage
Figure 9 : Total Harmonic Distortion versus
Output Power
Figure 10 : Output Power versus Input Level
Figure 11 : Power Dissipation versus Output
Power
5/15
TDA2030A
Figure 12 : Single Supply High Power Amplifier (TDA2030A + BD907/BD908)
Figure 13 : P.C. Board and Component Layout for the Circuit of Figure 12 (1:1 scale)
6/15
TDA2030A
TYPICAL PERFORMANCE OF THE CIRCUIT OF FIGURE 12
Symbol
Parameter
Test Conditions
Vs
Supply Voltage
Id
Quiescent Drain Current
Vs = 36V
Po
Output Power
d = 0.5%, RL = 4Ω, f = 40 z to 15Hz
Vs = 39V
Vs = 36V
d = 10%, RL = 4Ω, f = 1kHz
Vs = 39V
Vs = 36V
Gv
Voltage Gain
SR
Slew Rate
d
f = 1kHz
Total Harmonic Distortion
Po = 20W
Min.
19.5
Typ.
Max.
36
44
Unit
V
50
mA
35
28
W
W
44
35
W
W
20
20.5
dB
8
V/µsec
f = 1kHz
f = 40Hz to 15kHz
0.02
0.05
%
%
mV
Vi
Input Sensitivity
Gv = 20dB, f = 1kHz, Po = 20W, RL = 4Ω
890
S/N
Signal to Noise Ratio
RL = 4Ω, Rg = 10kΩ, B = Curve A
Po = 25W
Po = 4W
108
100
dB
Figure 14 : Typical Amplifier with Spilt Power Supply
Figure 15 : P.C. Board and Component Layout for the Circuit of Figure 14 (1:1 scale)
7/15
TDA2030A
Figure 16 : Bridge Amplifier with Split Power Supply (PO = 34W, VS = ± 16V)
Figure 17 : P.C. Board and Component Layout for the Circuit of Figure 16 (1:1 scale)
MULTIWAY SPEAKER SYSTEMS AND ACTIVE
BOXES
Multiway loudspeaker systems provide the best
possible acoustic performance since each loudspeaker is specially designed and optimized to
handle a limited range of frequencies. Commonly,
these loudspeaker systems divide the audio spectrum into two or three bands.
To maintain a flat frequency response over the Hi-Fi
audio range the bands covered by each loudspeaker must overlap slightly. Imbalance between
the loudspeakers produces unacceptable results
8/15
therefore it is important to ensure that each unit
generates the correct amount of acoustic energy
for its segmento of the audio spectrum. In this
respect it is also important to know the energy
distribution of the music spectrum to determine the
cutoff frequencies of the crossover filters (see Figure 18). 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.
TDA2030A
Figure 18 : Power Distribution versus Frequency
A more effective solution, named "Active Power
Filter" by SGS-THOMSON is shown in Figure 19.
Figure 19 : 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
inductors and non-electrolytic capacitors. In addition, active filters do not suffer from the typical
defects of passive filters:
- power less
- increased impedance seen by the loudspeaker
(lower damping)
- difficulty of precise design due to variable loudspeaker impedance.
Obviously, active crossovers can only be used if a
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
necessary and simple RC low-pass and high-pass
networks (6dB/octave) can be recommended.
The result obtained are excellent because this is
the best type of audio filter and the only one free
from phase and transient distortion.
The rather poor out of band attenuation of single
RC filters means that the loudspeaker must operate
linearly well beyond the crossover frequency to
avoid distortion.
The proposed circuit can realize combined power
amplifiers and 12dB/octave or 18dB/octave highpass or low-pass filters.
In practice, at the input pins of the amplifier two
equal and in-phase voltages are available, as required for the active filter operation.
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.
The component values calculated for fc = 900Hz
using a Bessek 3rd order Sallen and Key structure
are :
C1 = C2 = C3
R1
R2
R3
22nF
8.2kΩ
5.6kΩ
33kΩ
Using this type of crossover filter, a complete 3-way
60W active loudspeaker system is shown in Figure 20.
It employs 2nd order Buttherworth filters with the
crossover frequencies equal to 300Hz and 3kHz.
The midrange section consists of two filters, a high
pass circuit followed by a low pass network. With
VS = 36V the output power delivered to the woofer
is 25W at d = 0.06% (30W at d = 0.5%).
The power delivered to the midrange and the
tweeter can be optimized in the design phase
taking in account the loudspeaker efficiency and
impedance (RL = 4Ω to 8Ω).
It is quite common that midrange and tweeter
speakers have an efficiency 3dB higher thanwoofers.
9/15
TDA2030A
Figure 20 : 3 Way 60W Active Loudspeaker System (VS = 36V)
10/15
TDA2030A
MUSICAL INSTRUMENTS AMPLIFIERS
Another important field of application for active
systems is music.
In this area the use of several medium power
amplifiers is more convenient than a single high
power amplifier, and it is also more realiable.
A typical example (see Figure 21) consist of four
amplifiers each driving a low-cost, 12 inch loudspeaker. This application can supply 80 to
160WRMS.
down to the values as low as 0.002% in high power
amplifiers.
Figure 22 : Overshoot Phenomenon in Feedback
Amplifiers
Figure 21 : High Power Active Box
for Musical Instrument
TRANSIENT INTERMODULATION DISTORTION (TIM)
Transient intermodulation distortion is an unfortunate phenomen associated with negative-feedback
amplifiers. When a feedback amplifier receives an
input signal which rises very steeply, i.e. contains
high-frequency components, the feedback can arrive too late so that the amplifiers overloads and a
burst of intermodulation distortion will be produced
as in Figure 22. Since transients occur frequently
in music this obviously a problem for the designer
of audio amplifiers. Unfortunately, heavy negative
feedback is frequency used to reduce the total
harmonic distortion of an amplifier, which tends to
aggravate the transient intermodulation (TIM situation. The best known method for the measurement
of TIM consists of feeding sine waves superimposed onto square waves, into the amplifier under
test. The output spectrum is then examined using
a spectrum analyser and compared to the input.
This method suffers from serious disadvantages :
the accuracy is limited, the measurement is a rather
delicate operation and an expensive spectrum analyser is essential. A new approach (see Technical
Note 143) applied by SGS-THOMSON to monolithic amplifiers measurement is fast cheap-it requires nothing more sophisticated than an
oscilloscope - and sensitive - and it can be used
The "inverting-sawtooh" method of measurement
is based on the response of an amplifier to a 20kHz
sawtooth waveform. The amplifier has no difficulty
following the slow ramp but it cannot follow the fast
edge. The output will follow the upper line in Figure 23 cutting of the shaded area and thus increasing the mean level. If this output signal is filtered to
remove the sawtooth, direct voltage remains which
indicates the amount of TIM distortion, although it
is difficult to measure because it is indistinguishable from the DC offset of the amplifier. This problem is neatly avoided in the IS-TIM method by
periodically inverting the sawtooth waveform at a
low audio frequency as shown in Figure 24.
Figure 23 : 20kHz Sawtooth Waveform
Figure 24 : Inverting Sawtooth Waveform
11/15
TDA2030A
In the case of the sawtooth in Figure 25 the mean
level was increased by the TIM distortion, for a
sawtooth in the other direction the opposite is true.
The result is an AC signal at the output whole
peak-to-peak value is the TIM voltage, which can
be measured easily with an oscilloscope. If the
peak-to-peak value of the signal and the peak-topeak of the inverting sawtooth are measured, the
TIM can be found very simply from:
VOUT
⋅ 100
TIM =
Vsawtooth
In Figure 25 the experimental results are shown for
the 30W amplifier using the TDA2030A as a driver
and a low-cost complementary pair. A simple RC
filter on the input of the amplifier to limit the maximum signal slope (SS) is an effective way to reduce
TIM.
Figure 26 : TIM Design Diagram (fC = 30kHz)
POWER SUPPLY
Figure 25 : TIM Distortion versus Output Power
Using monolithic audio amplifier with non-regulated supply voltage it is important to design the
power supply correctly. In any working case it must
provide a supply voltage less than the maximum
value fixed by the IC break-down voltage.
It is essential to take into account all the working
conditions, in particular mains fluctuations and supply voltage variations with and without load. The
TDA2030A (VS max = 44V) is particularly suitable for
substitution of the standard IC power amplifiers
(with VS max = 36V) for more reliable applications.
An example, using a simple full-wave rectifier followed by a capacitor filter, is shown in the table 1
and in the diagram of Figure 27.
Figure 27 : DC Characteristics of
50W Non-regulated Supply
The diagram of Figure 26 originated by SGSTHOMSON can be used to find the Slew-Rate (SR)
required for a given output power or voltage and a
TIM design target.
For example if an anti-TIM filter with a cutoff at
30kHz is used and the max. peak-to-peak output
voltage is 20V then, referring to the diagram, a
Slew-Rate of 6V/µs is necessary for 0.1% TIM.
As shown Slew-Rates of above 10V/µs do not
contribute to a further reduction in TIM.
Slew-Rates of 100/µs are not only useless but also
a disadvantage in Hi-Fi audio amplifiers because
they tend to turn the amplifier into a radio receiver.
12/15
TDA2030A
APPLICATION SUGGESTION
The recommended values of the components are
those shown on application circuit of Figure 14.
Different values can be used. The Table 2 can help
the designer.
Table 1
DC Output Voltage (Vo)
Mains
(220V)
Secondary
Voltage
Io = 0
Io = 0.1A
Io = 1A
+ 20%
28.8V
43.2V
42V
37.5V
+ 15%
27.6V
41.4V
40.3V
35.8V
+ 10%
26.4V
39.6V
38.5V
34.2V
–
24V
36.2V
35V
31V
– 10%
21.6V
32.4V
31.5V
27.8V
– 15%
20.4V
30.6V
29.8V
26V
– 20%
19.2V
28.8V
28V
24.3V
SHORT CIRCUIT PROTECTION
The TDA2030A has an original circuit which limits
the current of the output transistors. This function
can be considered as being peak power limiting
rather than simple current limiting. It reduces the
possibility that the device gets damaged during an
accidental short circuit from AC output to ground.
A regulated supply is not usually used for the power
output stages because of its dimensioning must be
done taking into account the power to supply in the
signal peaks. They are only a small percentage of
the total music signal, with consequently large
overdimensioning of the circuit.
Even if with a regulated supply higher output power
can be obtained (VS is constant in all working conditions), the additional cost and power dissipation do
not usually justify its use. Using non-regulated supplies, there are fewer designe restriction. In fact, when
signal peaks are present, the capacitor filter acts as
a flywheel supplying the required energy.
In average conditions, the continuous power supplied is lower. The music power/continuous power
ratio is greater in this case than for the case of
regulated supplied, with space saving and cost
reduction.
THERMAL SHUT-DOWN
The presence of a thermal limiting circuit offers the
following advantages:
1. An overload on the output (even if it is
permanent), or an above limit ambient
temperature can be easily supported since the
Tj cannot be higher than 150oC.
2. The heatsink can have a smaller factor of safety
compared with that of a conventional circuit.
There is no possibility of device damage due to
high junction temperature. If for any reason, the
junction temperature increases up to 150oC,
the thermal shut-down simply reduces the
p ower dissip at io n a nd t he curren t
consumption.
Table 2
R1
R2
R3
R4
Recom.
Value
22kΩ
680Ω
22kΩ
1Ω
R5
≅ 3 R2
C1
1µF
Input DC Decoupling
C2
22µF
Inverting DC Decoupling
C3, C4
C5, C6
0.1µF
100µF
Supply Voltage Bypass
Supply Voltage Bypass
C7
C8
0.22µF
1
≈
2πBR1
Frequency Stability
D1, D2
1N4001
To protect thedeviceagainst output voltagespikes
Comp.
Purpose
Closed loop gain setting
Closed loop gain setting
Non inverting input biasing
Frequency Stability
Upper Frequency Cut-off
UpperFrequencyCut-off
Larger than
Recommended Value
Increase of gain
Decrease of gain (*)
Increase of input impedance
Danger of oscillation at high
frequencies with inductive
loads
Poor High Frequencies
Attenuation
Smaller than
Recommended Value
Decrease of gain
Increase of gain
Decrease of input impedance
Danger of Oscillation
Increase of low frequencies
cut-off
Increase of low frequencies
cut-off
Danger of Oscillation
Danger of Oscillation
Larger Bandwidth
SmallerBandwidth
LargerBandwidth
(*) The value of closed loop gain must be higher than 24dB.
13/15
TDA2030A
DIM.
A
C
D
D1
E
E1
F
F1
G
G1
H2
H3
L
L1
L2
L3
L4
L5
L6
L7
L9
L10
M
M1
V4
V5
Dia
MIN.
mm
TYP.
2.4
1.2
0.35
0.76
0.8
1.0
3.2
6.6
3.4
6.8
10.05
17.55
15.55
21.2
22.3
17.85
15.75
21.4
22.5
2.6
15.1
6.0
2.1
4.3
4.23
3.75
4.5
4.0
3.65
MAX. MIN.
4.8
1.37
2.8
0.094
1.35 0.047
0.55 0.014
1.19 0.030
1.05 0.031
1.4
0.039
3.6
0.126
7.0
0.260
10.4
10.4 0.396
18.15 0.691
15.95 0.612
21.6 0.831
22.7 0.878
1.29
3.0
0.102
15.8 0.594
6.6
0.236
2.7
0.008
4.8
0.17
4.75 0.167
4.25 0.148
40˚ (typ.)
90˚ (typ.)
3.85 0.144
inch
TYP.
0.134
0.268
0.703
0.620
0.843
0.886
0.178
0.157
MAX.
0.189
0.054
0.110
0.053
0.022
0.047
0.041
0.055
0.142
0.276
0.409
0.409
0.715
0.628
0.850
0.894
0.051
0.118
0.622
0.260
0.106
0.189
0.187
0.167
OUTLINE AND
MECHANICAL DATA
Weight: 2.00gr
Pentawatt V
0.152
L
L1
E
M1
A
M
D
C
D1
L5
V5
L2
H2
L3
F
E
E1
V4
H3
G G1
Dia.
F
F1
L9
L4
L10
L7
L6
H2
V4
RESIN BETWEEN
LEADS
PENTVME
0015981
14/15
TDA2030A
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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 otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to
change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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PENTAWATT® is a Registered Trademark of STMicroelectronics
© 2000 STMicroelectronics – Printed in Italy – All Rights Reserved
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15/15
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