TDA2050 [STMICROELECTRONICS]
32W Hi-Fi AUDIO POWER AMPLIFIER; 32W高保真音频功率放大器
| 型号： | TDA2050 |
| 厂家： | 
ST |
| 描述： | 32W Hi-Fi AUDIO POWER AMPLIFIER |
| 文件： | 总13页 (文件大小：187K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TDA2050
32W Hi-Fi AUDIO POWER AMPLIFIER
HIGH OUTPUT POWER
(50W MUSIC POWER IEC 268.3 RULES)
HIGH OPERATING SUPPLY VOLTAGE (50V)
SINGLE OR SPLIT SUPPLY OPERATIONS
VERY LOW DISTORTION
SHORT CIRCUIT PROTECTION (OUT TO
GND)
THERMAL SHUTDOWN
Pentawatt
ORDERING NUMBERS: TDA2050V
DESCRIPTION
TDA2050H
The TDA 2050 is a monolithic integrated circuit in
Pentawatt package, intended for use as an audio
class AB audio amplifier. Thanks to its high power
capability the TDA2050 is able to provide up to
35W true rms power into 4 ohm load @ THD =
10%, VS = ±18V, f = 1KHz and up to 32W into
8ohm load @ THD = 10%, VS = ±22V, f = 1KHz.
Moreover, the TDA 2050 delivers typically 50W
music power into 4 ohm load over 1 sec at VS=
22.5V, f = 1KHz.
The high power and very low harmonic and cross-
over distortion (THD = 0.05% typ, @ VS = ±22V,
PO = 0.1 to 15W, RL=8ohm, f = 100Hz to 15KHz)
make the device most suitable for both HiFi and
high class TV sets.
TEST AND APPLICATION CIRCUIT
March 1995
1/13
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
TDA2050
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VS
Vi
Supply Voltage
±25
V
Input Voltage
VS
Vi
Differential Input Voltage
±15
V
A
IO
Output Peak Current (internally limited)
Power Dissipation TCASE = 75°C
5
25
Ptot
Tstg, Tj
W
°C
Storage and Junction Temperature
-40 to 150
PIN CONNECTION (Top view)
SCHEMATIC DIAGRAM
THERMAL DATA
Symbol
Description
Value
Unit
Rth j-case Thermal Resistance junction-case
Max
3
°C/W
2/13
TDA2050
ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit, VS = ±18V, Tamb = 25°C, f = 1 kHz; un-
less otherwise specified)
Symbol
Parameter
Supply Voltage Range
Quiescent Drain Current
Test Condition
Min.
Typ.
Max.
Unit
VS
Id
±4.5
±25
V
VS = ±4.5V
S = ±25V
30
55
50
90
mA
mA
V
Ib
Input Bias Current
Input Offset Voltage
Input Offset Current
RMS Output Power
VS = ±22V
VS = ±22V
VS = ±22V
0.1
0.5
±15
µA
mV
nA
VOS
IOS
PO
±200
d = 0.5%
RL = 4Ω
RL = 8Ω
24
22
28
18
25
W
W
W
V
S = ±22V RL = 8Ω
d = 10%
RL = 4Ω
RL = 8Ω
35
22
32
W
W
W
V
S = ±22V RL = 8Ω
d = 10%; T = 1s
S = ±22.5V; RL = 4Ω
Music Power
IEC268.3 RULES
V
50
W
d
Total Harmonic Distortion
RL = 4Ω
f = 1kHz, PO = 0.1 to 24W
f = 100Hz to 10kHz, PO = 0.1 to 18W
0.03
0.5
0.5
%
%
VS = ±22V RL = 8Ω
f = 1kHz, PO = 0.1 to 20W
f = 100Hz to 10kHz, PO = 0.1 to 15W
0.02
%
%
0.5
SR
GV
GV
BW
eN
Slew Rate
5
8
80
V/µs
dB
Open Loop Voltage Gain
Closed Loop Voltage Gain
Power Bandwidth (-3dB)
Total Input Noise
30
30.5
31
10
dB
RL = 4Ω Vi = 200mV
20 to 80,000
Hz
curve A
B = 22Hz to 22kHz
4
5
µV
µV
Ri
Input Resistance (pin 1)
Supply Voltage Rejection
500
kΩ
SVR
Rs = 22kΩ; f = 100Hz;
V
ripple = 0.5Vrms
45
65
dB
%
η
Efficiency
PO = 28W; RL = 4Ω
PO = 25W; RL = 8Ω;
V
S = ±22V
67
%
Tsd-j
Thermal Shut-down
150
°C
Junction Temperature
3/13
TDA2050
Figure 1: Split Supply Typical Application Circuit
Figure 2: P.C. Board and ComponentsLayout of the Circuit of Fig. 1 (1:1)
TDA2050
RL
R4
R3
R2
+Vs
C7
C5
C2
C3
R1
C4
C6
C1
-Vs
Vi
4/13
TDA2050
of fig. 2. Different values can be used. The follow-
ing table can help the designer.
SPLIT SUPPLY APPLICATION SUGGESTIONS
The recommended values of the external compo-
nents are those shown on the application circuit
Recommended
Larger than
Recommended Value
Smaller than
Recommended Value
Component
Purpose
Value
R1
22kΩ
Input Impedance
Increase of Input
Impedance
Decrease of Input
Impedance
R2
R3
R4
C1
680Ω
22kΩ
2.2Ω
1µF
Feedback Resistor
Decrease of Gain (*)
Increase of Gain
Increase of Gain
Decrease of Gain (*)
Frequency Stability
Input Decoupling DC
Danger of Oscillations
Higher Low-frequency
cut-off
C2
22µF
100nF
220µF
0.47µF
Inverting Input
DC Decoupling
Increase of Switch
ON/OFF Noise
Higher Low-frequency
cut-off
C3
C4
Supply Voltage Bypass
Supply Voltage Bypass
Frequency Stability
Danger of Oscillations
Danger of Oscillations
Danger of Oscillations
C5
C6
C7
(*) The gain must be higher than 24dB
ground points of input 1 and input 2 must be well
decoupled from the ground return of the output in
which a high current flows.
PRINTED CIRCUIT BOARD
The layout shown in fig. 2 should be adopted by
the designers. If different layouts are used, the
5/13
TDA2050
Figure 3: Single Supply Typical Application Circuit
Figure 4: P.C. Board and ComponentsLayout of the Circuit of Fig. 3 (1:1)
6/13
TDA2050
SINGLE SUPPLY APPLICATION SUGGESTIONS
of fig. 3. Different values can be used. The follow-
ing table can help the designer.
The recommended values of the external compo-
nents are those shown on the application circuit
Recommended
Larger than
Recommended Value
Smaller than
Recommended Value
Component
Purpose
Biasing Resistor
Value
22kΩ
22kΩ
680Ω
2.2Ω
R1, R2, R3
R4
R5
R6
C1
Increase of Gain
Decrease of Gain (*)
Increase of Gain
Feedback Resistors
Decrease of Gain (*)
Danger of Oscillations
Frequency Stability
Input Decoupling DC
2.2µF
Higher Low-frequency
cut-off
C2
C3
100µF
Supply Voltage Rejection
Supply Voltage Bypass
Worse Turn-off Transient
Worse Turn-on Delay
1000µF
Danger of Oscillations
Worse of Turn-off
Transient
C4
22µF
Inverting Input DC
Decoupling
Increase of Switching
ON/OFF
Higher Low-frequency
cut-off
C5
C6
C7
100nF
0.47µF
1000µF
Supply Voltage Bypass
Frequency Stability
Danger of Oscillations
Danger of Oscillations
Output DC Decoupling
Higher Low-frequency
cut-off
(*) The gain must be higher than 24dB
be used (i.e. 22µF).
NOTE
C7 can be larger than 1000uF only if the supply
voltage does not exceed 40V.
If the supply voltage is lower than 40V and the
load is 8ohm (or more) a lower value of C2 can
TYPICAL CHARACTERISTICS (Split Supply Test Circuit unless otherwise specified)
Figure 5: Output Power vs. Supply Voltage
Figure 6: Distortion vs. Output Power
7/13
TDA2050
Figure 8: Distortion vs. Output Power
Figure 7: Output Power vs. Supply Voltage
Figure 10: Distortion vs. Frequency
Figure. 9: Distortion vs. Frequency
Figure 12: SupplyVoltageRejection vs.Frequency
Figure 11: QuiescentCurrent vs. Supply Voltage
8/13
TDA2050
Figure 13: SupplyVoltage Rejection vs. Fre-
quency (Single supply) for Different
values of C2 (circuit of fig. 3)
Figure 16: Total Power Dissipation and Effi-
ciency vs. Output Power
Figure 14: SupplyVoltage Rejection vs. Fre-
quency (Single supply) for Different
values of C2 (circuit of fig. 3)
SHORT CIRCUIT PROTECTION
The TDA 2050 has an original circuit which limits
the current of the output transistors. The maxi-
mum output current is a function of the collector
emitter voltage; hence the output transistors work
within their safe operating area. This function can
therefore be considered as being peak power lim-
iting 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 SHUTDOWN
The presence of a thermal limiting circuit offers
the following advantages:
Figure 15: Total Power Dissipation and Effi-
ciency vs. Output Power
1)An overload on the output (even if it is perma-
nent), or an above limit ambient temperature
can be easily tolerated since the Tj cannot be
higher than 150°C.
2)The heatsink can have a smaller factor of
safety compared with that of a conventional
circuit. There is no possibility of device dam-
age due to high junction temperature. If for
any reason, the junction temperature in-
creases up to 150°C, the thermal shutdown
simply reduces the power dissipation and the
current consumption.
The maximum allowable power dissipation de-
pends upon the thermal resistance junction-ambi-
9/13
TDA2050
ent. Fig. 17 shows this dissipable power as a
function of ambient temperature for different ther-
mal resistance.
cient. Between the heatsink and the package is
better to insert a layer of silicon grease, to opti-
mize the thermal contact; no electrical isolation is
needed between the two surfaces. Fig. 18 shows
an example of heatsink.
Figure 17: Maximum Allowable Power Dissipa-
tion vs. Ambient Temperature
Dimension suggestion
The following table shows the length that the
heatsink in fig. 18 must have for several values
of Ptot and Rth.
Ptot (W)
12
60
8
6
Lenght of heatsink (mm)
Rth of heatsink (°C/W)
40
6.2
30
8.3
4.2
Figure 18: Example of heat-sink
MOUNTING INSTRUCTIONS
The power dissipated in the circuit must be re-
moved by adding an external heatsink.
Thanks to the PENTAWATT package, the
heatsink mounting operation is very simple, a
screw or a compression spring (clip) being suffi-
APPENDIX A
A.1 - MUSIC POWER CONCEPT
The target of this method is to avoid excessive
dissipation in the amplifier.
MUSIC POWER is (according to the IEC clauses
n.268-3 of Jan 83) the maximum power which the
amplifier is capable of producing across the rated
load resistance (regardless of non linearity) 1 sec
after the application of a sinusoidal input signal of
frequency1 KHz.
A.2 - INSTANTANEOUS POWER
Another power measurement (MAXIMUM IN-
STANTANEOUS OUTPUT POWER) was pro-
posed by IEC in 1988 (IEC publication 268-3 sub-
clause 19.A).
We give here only a brief extract of the concept,
and a circuit useful for the measurement.
According to this definition our method of meas-
urement comprises the following steps:
- Set the voltage supply at the maximum oper-
ating value;
The supply voltage is set at the maximum operat-
ing value.
- Apply a input signal in the form of a 1KHz tone
burst of 1 sec duration: the repetition period
of the signal pulses is 60 sec;
The test signal consists of a sinusoidal signal
whose frequency is 20 Hz, to which are added al-
ternate positive and negative pulses of 50 µs du-
ration and 500 Hz repetition rate. The amplitude
of the 20 Hz signal is chosen to drive the amplifier
to its voltage clipping limits, while the amplitude of
the pulses takes the amplifier alternately into its
current-overload limits.
- The output voltage is measured 1 sec from the
start of the pulse;
- Increase the input voltage until the output sig-
nal shows a THD=10%;
- The music power is then V2
/RL, where
out
Vout is the output voltage measured in the
condition of point 4 and RL is the rated load
impedance;
10/13
TDA2050
power of the amplifier, because the duty-cycle of
the high output current is low.
A circuit for generating the test signal is given in
fig. 19.
By feeding the amplifier output voltage to the X-
plates of an oscilloscope, and the voltage across
the 1 ohm resistor (representing the output cur-
rent) to the Y=plates, it is possible to read on the
display the value of the maximum instantaneous
output power.
The load network consists of a 40 µF capacitor, in
series with a 1 ohm resistor. The capacitor limits
the current due to the 20 Hz signal to a low value,
whereas for he short pulses the effective load im-
pedance is of the order of 1 ohm, and a high out-
put current is produced.
Using this signal and load network the measure-
ment may be made without causing excessive
dissipation in the amplifier. The dissipation in the
1 ohm resistor is much lower than a rated output
The result of this test applied at the TDA 2050 is:
PEAK POWER = 100W typ
Figure 19: Test circuit for peak power measurement
11/13
TDA2050
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
TDA2050
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 otherwise under 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.
1994 SGS-THOMSON Microelectronics - All RightsReserved
PENTAWATT is a Registered Trademark of SGS-THOMSON Microelectronics
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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13/13
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