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14W HI-FI AUDIO AMPLIFIER
DESCRIPTION The Contek TDA2030A is a monolithic audio power amplifier integrated circuit.
FEATURES *Very low external component required. *High current output and high operating voltage. *Low harmonic and crossover distortion. *Built-in Over temperature protection. *Short circuit protection between all pins. *Safety Operating Area for output transistors.
1
TO-220B
PIN CONFIGURATIONS 1 Non inverting input 2 Inverting input 3 -VS 4 Output 5 +VS
ABSOLUTE MAXIMUM RATINGS (Ta=25 C)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage Vs +-12 V Input Voltage Vi Vs V Differential Input Voltage Vdi +-15 V Peak Output Current(internally limited) Io 3.5 A Total Power Dissipation at Tcase=90 C Ptot 20 W Storage Temperature Tstg -40~+150 C Junction Temperature Tj -40~+150 C
ELECTRICAL CHARACTERISTICS(Refer to the test circuit, Vs =+-16V,Ta=25 C)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Supply Voltage Vs +-6 +-22 V Quiescent Drain Current
Id 50 80 mA
Input Bias Current Ib 0.2 2 mA Input Offset Voltage Vos Vs=+-18v +-2 +-20 mV Input Offset Current Ios +-20 +-200 nA
Contek Microelectronics Co.,Ltd.
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(Continued) Output Power Po d=0.5%,Gv=26dB,f=40 to 5kHz RL=8W 15 18 W RL=4W 10 12 W Vs=+-19V, RL=4W 13 16 W Power Bandwidth BW Po=15W,RL=4W 100 KHz Open loop voltage Gain
Gvo f=1kHz 80 dB
Closed Loop Voltage Gain
Gvc 25.5 26 26.5 dB
Total harmonic distortion
THD Po=0.1 to 14W,RL=4W f=1kHz
Po=0.1 to 14W,RL=4W f=1kHz
Total harmonic Distortion
THD Po=0.1 to 9W,RL=8W f=40 to 15 kHz
Second Order CCIF Intermodulation distortion
d2 Po=4W ,RL=8W f2-f1=1 kHz
Third Order CCIF Intermodulation Distortion
d3 f2=14 kHz,f1=15kHz 0.08 %
Input Noise Voltage B=curve A 2 mA Input Noise Voltage eN B= 22Hz to 22kHz 3 10 mV Input Noise Current i N B= 22Hz to 22kHz 80 200 pA Input Resistance(pin 1)
Ri Open loop,f=1kHz 0.5 5 MW
Supply Voltage Rejection
RL=4W,Gv=26dB Rg=22kW,f=1kHz
54 dB
Thermal Shut- Down Junction Temperature
Tj 145 C
Contek Microelectronics Co.,Ltd.
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Contek TDA2030A
1
(^2 )
5 4
Vi
+Vs
C
220nF
0.1 mF
1N
100k W
R
1 W
RL=4W
4.7k W
1N
100k W
2.2 mF
100k W
2.2 mF
100k W
22 mF
220 mF
m
F
Fig.1 Single supply amplifier
Contek Microelectronics Co.,Ltd.
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TYPICAL PERFORMANCE CHARACTERISTICS
101 102 103 104 105 106 107
20
60
100
140
Phase
Gain
Gv (dB)
180
90
0
Phase
Fig.2 Open loop frequency
response
24 28 32 36 40 44
24
4
8
12
16
20 RL=4 W
RL=8 W
Gv=26dB d=0.5% f=40 to 15kHz
Fig.3 Output power vs. Supply
voltage
Fig.4 Total harmonic distortion
vs. output power
Fig.5 Two tone CCIF
intermodulation distortion
10 -2 10 -1^100 101
10 -
10 -
100
101
102
Vs=38V RL=8 W
Vs=32V RL=4 W
f=15kHz
f=1kHz
Gv=26dB
101 102
10 -
10 -
100
101
102
103 104 105
Order (2f1-f2)
Order (2f2-f1)
Vs=32V Po=4W RL=4 W Gv=26dB
Fig.6 Large signal frequency
response
Fig.7 Maximum allowable power
dissipation vs. ambient
temperture
101 102 103 104
30
5
10
15
20
25
Vs=+-15V RL=4 W
Vs=+-15V RL=8 W
-50 0 50 100 150 200
30
5
10
15
20
25
infinite heatsink
heatsink
(^) having
Rty= (^) X (^) C/W
heatsink (^) having Rth= (^) X heatsink havingC/W Rth= (^) X C/W
Tamb ( X C)
Ptot (W)
Frequency (kHz)
Vo (Vp-p)
Po (W) Frequency (Hz)
Po (W)
Frequency (Hz) Vs (V)
Po (W)
d ( % ) d ( % )
Contek Microelectronics Co.,Ltd.
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TYPICAL PERFORMANCE CHARACTERISTICS
24 28 32 34 36 40
5
15
25
35
45
Fig. 10 Output power vs. supply voltage Po (W)
Vs (V) 10 -1^100
10 -
10 -
100
f=15kHz f=1kHz
Vs=36V RL=4 W Gv=20dB
d (%)
Po (W)
Fig. 11 Total harmonic distortion vs. output power
100 250 400 550 700
0
5
10
15
20 Gv=26dB
Gv=20dB
Vi (mV)
Po (W)
Fig. 12 Output power vs. Input level
0
5
10
15
20
0 8 16 24 32 Po (W)
Ptot (W)
Complete Amplifier
BD908/ BD
Contek TDA
Fig. 13 Power dissipation vs. output power
Contek Microelectronics Co.,Ltd.
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Fig. 14 Typical amplifier with split power supply
Fig. 16 Bridge amplifier with split power supply(Po=34W,Vs+=16V,Vs-=16V)
Contek
TDA2030A
Vi
+Vs
-Vs
C
1 mF
C
22 mF
C
100 mF
C
100nF
C
220nF
C
100nF
C
100 mF D 1N
D
1N
R
22kW
R
22kW
R5 C8^ R
1 W
RL
R
680 W
Contek TDA2030A
Contek TDA2030A
C 220 m F
C 100 m F
C 100nF
1
C
mF
C 22 m F
C
mF
C 22 m F C 100nF
C 100 m F
R 22k W
R 22k W
R 680 W
R 1 W
R 1 W
R 680 W
R 22k W
R 22k W
R 22k W
Vs+
Vs-
IN
RL 8 W
Contek Microelectronics Co.,Ltd.
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The components values calculated for fc=900Hz using a Bessel 3rd Sallen and Key structure are: C1=C2=C3=22nF,R1=8.2K W,R2=5.6KW,R3=33KW. Using this type of crossover filter, a complete 3-way 60W active loudspeaker system is shown in Fig. 20. It employs 2nd order Buttherworth filter with the crossover frequencies equal to 300Hz and 3kHz. The midrange section consistors 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=4 W to 8W). It is quite common that midrange and tweeter speakers have an efficiency 3dB higher than woofers.
Contek TDA2030A
Contek TDA2030A
Contek TDA2030A
2200 mF
mF
18nF 33nF 100 mF
mF
1N 1 mF
0.1 mF 0.1 mF
0.22 mF
Vs+
18nF
3.3nF
100 mF
0.22 mF
0.1 mF 0.1 mF
47 mF
mF
100 mF
mF
220 mF
mF
2200 mF
1N
BD
BD
22k W
1 W 4 W
W
W 3.3k
W
22k W
22k
W
680
W
100
W
1 W
22k W 22k W
6.8k
W 3.3k
W
100
W
2.2k W Vs+
1N
1N
1N
8 W
1 W
2.2k W
12k
W
100
W
22k
W
8 W 22k
W
22k
W
Vs+
100
mF
Vs+
IN
Woofer
Midrange
Tweeter High-pass 3kHz
High-pass 3kHz
Band-pass 300Hz to 3kHz
Low-pass 300Hz
1N
Contek Microelectronics Co.,Ltd.
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MUSICAL INSTRUMENTS AMPLIFIERS Another important field of application for active system 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 reliable. A typical example(see Fig. 21) consist of four amplifiers each driving a low-cost, 12 inch loudspeaker. This application can supply 80 to 160W rms.
TRANSIENT INTER-MODULATION DISTORTION(TIM) Transient inter-modulation distortion is an unfortunate phenomena 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 inter-modulation distortion will be produced as in Fig.22.Since transients occur frequently in music this obviously a problem for the designed 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 inter- modulation(TIM situation.)The best known
20 to 40W Amplifier
20 to 40W Amplifier
20 to 40W Amplifier
20 to 40W Amplifier
PRE AMPLIFIER
POWER AMPLIFIER
FEEDBACK PATH
INPUT V1 V2 V3 V
V OUTPUT
V
V
V V
Fig.21 High power active box for musical instrument
Fig.22 Overshoot phenomenon in feedback amplifiers
method for the measurement of TIM consists of feeding sine waves superimposed onto square wavers, into the amplifier under test. The output spectrum is then examined using a spectrum analyzer and compared to the input. This method suffers from serious disadvantages: the accuracy is limited, the measurement is a tatter delicate operation and an expensive spectrum analyzer is essential. A new approach (see Technical Note 143(Applied by SGS to monolithic amplifiers measurement is fast cheap, it requires nothing more sophisticated than an oscilloscope-and sensitive-and it can be used down to the values as low as 0.002% in high power amplifiers. The "inverting- sawtooth" method of measurement is based on the response of an amplifier to a 20KHz saw-tooth wave-form. The amplifier has no difficulty following the slow ramp but it cannot follow the fast edge. The output will follow the upper line in Fig.23 cutting of the shade area and thus increasing the mean level. If this output signal is filtered to remove the saw-tooth, 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 saw-tooth wave-form at a low audio frequency as shown in Fig.24.Inthe case of the saw-tooth in Fig. 25 the means level was increased by the TIM distortion, for a saw-tooth in the other direction the opposite is true.
Contek Microelectronics Co.,Ltd.
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It is essential to take into account all the working conditions, in particular mains fluctuations and supply voltage variations with and without load. The TDA2030(Vsmax=44V) is particularly suitable for substitution of the standard IC power amplifiers(with Vsmax=36V) for more reliable applications. An example, using a simple full-wave rectifier followed by a capacitor filter, is shown in the table and in the diagram of Fig.27. 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 signal peaks. They are not 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 designee 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 case than for the case of regulated supplied, with space saving and cost reduction.
0 0.4 0.8 1.2 1.6 2.
28
30
32
34
36
Vo(V)
Io(A)
Fig.27 DC characteristics of 50W non-regulated supply
Vo
3300 mF
220V
0
2
4
Ripple (Vp-p)
Ripple
Vout
Mains(220V) Secondary Voltage DC Output Voltage(Vo)
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.
Contek Microelectronics Co.,Ltd.
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SHORT CIRCUIT PROTECTION The Contek TDA2030 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.
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 can not be higher than 150 C 2).The heatsink can have a smaller factor of safety compared with that of a congenital circuit, There is no possibility of device damage due to high junction temperature increase up to 150, the thermal shut-down simply reduces the power dissipation and the current consumption.
APPLICATION SUGGESTION The recommended values of the components are those shown on application circuit of Fig.14. Different values can be used. The following table can help the designer.
COMPONENT RECOMMENDED
VALUE
PURPOSE LARGE THAN
RECOMMENDED
VALUE
LARGE THAN
RECOMMENDED
VALUE
R1 22KW Closed loop gaon setting.
Increase of Gain Decrease of Gain
R2 680 W Closed loop gaon setting.
Decrease of Gain Increase of Gain
R3 22KW Non inverting input biasing
Increase of input impedance
Decrease of input impedance R4 1 W Frequency stacility Danger of oscillation at high frequencies with inductive loads. R5 3R2 Upper frequency cutoff
Poor high frequencies attenuation
Dange of oscillation
C1 1 mF Input DC decoupling Increase of low frequencies cutoff C2 22 mF Inverting DC decoupling
Increase of low frequencies cutoff C3,C4 0.1mF Supply voltage bypass
Dange of oscillation
C5,C6 100 mF Supply voltage bypass
Dange of oscillation
C7 0.22mF Frequency stability Larger bandwidth C8 1/(2pBR1) Upper frequency cutoff
smaller bandwidth Larger bandwidth
D1,D2 1N4001 To protect the device against output voltage spikes.
Contek Microelectronics Co.,Ltd.
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