ST Microelectronics TDA2050V (73-123-09)

ST Microelectronics TDA2050V (73-123-09)
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
DESCRIPTION
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.
Pentawatt
ORDERING NUMBERS: TDA2050V
TDA2050H
The high power and very low harmonic and crossover 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 2002
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
V
VS
Supply Voltage
±25
Vi
Input Voltage
VS
Vi
Differential Input Voltage
±15
IO
Output Peak Current (internally limited)
5
A
Power Dissipation TCASE = 75°C
25
W
-40 to 150
°C
Ptot
Tstg, Tj
Storage and Junction Temperature
V
PIN CONNECTION (Top view)
SCHEMATIC DIAGRAM
THERMAL DATA
Symbol
Rth j-case
2/13
Description
Thermal Resistance junction-case
Max
Value
Unit
3
°C/W
TDA2050
ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit, VS = ±18V, Tamb = 25°C, f = 1 kHz; unless otherwise specified)
Symbol
Parameter
VS
Id
Supply Voltage Range
Quiescent Drain Current
Ib
Test Condition
Min.
Typ.
±4.5
VS = ±4.5V
VS = ±25V
30
55
0.1
Max.
Unit
±25
V
50
90
mA
mA
Input Bias Current
VS = ±22V
0.5
µA
VOS
Input Offset Voltage
VS = ±22V
±15
mV
IOS
Input Offset Current
VS = ±22V
±200
nA
PO
RMS Output Power
d = 0.5%
RL = 4Ω
RL = 8Ω
VS = ±22V RL = 8Ω
d = 10%
RL = 4Ω
RL = 8Ω
VS = ±22V RL = 8Ω
d
24
22
28
18
25
W
W
W
35
22
32
W
W
W
50
W
Music Power
IEC268.3 RULES
d = 10%; T = 1s
VS = ±22.5V; RL = 4Ω
Total Harmonic Distortion
RL = 4Ω
f = 1kHz, PO = 0.1 to 24W
f = 100Hz to 10kHz, PO = 0.1 to 18W
0.03
VS = ±22V RL = 8Ω
f = 1kHz, PO = 0.1 to 20W
f = 100Hz to 10kHz, PO = 0.1 to 15W
0.02
SR
Slew Rate
5
8
GV
GV
Open Loop Voltage Gain
Closed Loop Voltage Gain
30
80
30.5
BW
eN
Power Bandwidth (-3dB)
Total Input Noise
Ri
Input Resistance (pin 1)
SVR
η
Tsd-j
RL = 4Ω Vi = 200mV
curve A
B = 22Hz to 22kHz
Rs = 22kΩ; f = 100Hz;
Vripple = 0.5Vrms
Efficiency
PO = 28W; R L = 4Ω
PO = 25W; R L = 8Ω;
VS = ±22V
Thermal Shut-down
Junction Temperature
%
%
0.5
%
%
V/µs
31
dB
dB
20 to 80,000
4
5
10
Hz
µV
µV
500
Supply Voltage Rejection
0.5
0.5
kΩ
45
dB
65
%
67
%
150
°C
3/13
TDA2050
Figure 1: Split Supply Typical Application Circuit
Figure 2: P.C. Board and Components Layout of the Circuit of Fig. 1 (1:1)
TDA2050
RL
R4
R3
+Vs
R2
C7
C5
C2
C3
R1
C4
C6
C1
Vi
4/13
-Vs
TDA2050
SPLIT SUPPLY APPLICATION SUGGESTIONS
The recommended values of the external components are those shown on the application circuit
of fig. 2. Different values can be used. The following table can help the designer.
Larger than
Recommended Value
Smaller than
Recommended Value
Component
Recommended
Value
R1
22kΩ
Input Impedance
R2
680Ω
Feedback Resistor
R3
22kΩ
R4
2.2Ω
Frequency Stability
C1
1µF
Input Decoupling DC
C2
22µF
C3
C4
100nF
Inverting Input
DC Decoupling
Supply Voltage Bypass
C5
C6
220µF
Supply Voltage Bypass
Danger of Oscillations
C7
0.47µF
Frequency Stability
Danger of Oscillations
Purpose
Increase of Input
Impedance
Decrease of Input
Impedance
Decrease of Gain (*)
Increase of Gain
Increase of Gain
Decrease of Gain (*)
Danger of Oscillations
Higher Low-frequency
cut-off
Increase of Switch
ON/OFF Noise
Higher Low-frequency
cut-off
Danger of Oscillations
(*) The gain must be higher than 24dB
PRINTED CIRCUIT BOARD
The layout shown in fig. 2 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 ground return of the output in
which a high current flows.
5/13
TDA2050
Figure 3: Single Supply Typical Application Circuit
Figure 4: P.C. Board and Components Layout of the Circuit of Fig. 3 (1:1)
6/13
TDA2050
SINGLE SUPPLY APPLICATION SUGGESTIONS
The recommended values of the external components are those shown on the application circuit
Component
Recommended
Value
Purpose
of fig. 3. Different values can be used. The following table can help the designer.
Larger than
Recommended Value
Smaller than
Recommended Value
R1, R2, R3
22kΩ
R4
680Ω
Biasing Resistor
R5
22kΩ
R6
2.2Ω
Frequency Stability
C1
2.2µF
Input Decoupling DC
C2
100µF
Supply Voltage Rejection
C3
1000µF
Supply Voltage Bypass
C4
22µF
Inverting Input DC
Decoupling
C5
100nF
Supply Voltage Bypass
Danger of Oscillations
C6
0.47µF
Frequency Stability
Danger of Oscillations
C7
1000µF
Output DC Decoupling
Higher Low-frequency
cut-off
Feedback Resistors
Increase of Gain
Decrease of Gain (*)
Decrease of Gain (*)
Increase of Gain
Danger of Oscillations
Higher Low-frequency
cut-off
Worse Turn-off Transient
Worse Turn-on Delay
Danger of Oscillations
Worse of Turn-off
Transient
Increase of Switching
ON/OFF
Higher Low-frequency
cut-off
(*) The gain must be higher than 24dB
NOTE
If the supply voltage is lower than 40V and the
load is 8ohm (or more) a lower value of C2 can
be used (i.e. 22µF).
C7 can be larger than 1000uF only if the supply
voltage does not exceed 40V.
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 7: Output Power vs. Supply Voltage
Figure 8: Distortion vs. Output Power
Figure. 9: Distortion vs. Frequency
Figure 10: Distortion vs. Frequency
Figure 11: Quiescent Current vs. Supply Voltage
Figure 12: Supply Voltage Rejection vs. Frequency
8/13
TDA2050
Figure 13: Supply Voltage Rejection vs. Frequency (Single supply) for Different
values of C2 (circuit of fig. 3)
Figure 16: Total Power Dissipation and Efficiency vs. Output Power
Figure 14: Supply Voltage Rejection vs. Frequency (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 maximum 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 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.
Figure 15: Total Power Dissipation and Efficiency vs. Output Power
THERMAL SHUTDOWN
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 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 damage due to high junction temperature. If for
any reason, the junction temperature increases up to 150°C, the thermal shutdown
simply reduces the power dissipation and the
current consumption.
The maximum allowable power dissipation depends upon the thermal resistance junction-ambi9/13
TDA2050
ent. Fig. 17 shows this dissipable power as a
function of ambient temperature for different thermal resistance.
Figure 17: Maximum Allowable Power Dissipation vs. Ambient Temperature
cient. Between the heatsink and the package is
better to insert a layer of silicon grease, to optimize the thermal contact; no electrical isolation is
needed between the two surfaces. Fig. 18 shows
an example of heatsink.
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
8
6
Lenght of heatsink (mm)
60
40
30
Rth of heatsink (°C/W)
4.2
6.2
8.3
Figure 18: Example of heat-sink
MOUNTING INSTRUCTIONS
The power dissipated in the circuit must be removed 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
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
frequency 1 KHz.
According to this definition our method of measurement comprises the following steps:
- Set the voltage supply at the maximum operating 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 output voltage is measured 1 sec from the
start of the pulse;
- Increase the input voltage until the output signal shows a THD=10%;
- The music power is then V2out /RL, where
Vout is the output voltage measured in the
condition of point 4 and RL is the rated load
impedance;
10/13
The target of this method is to avoid excessive
dissipation in the amplifier.
A.2 - INSTANTANEOUS POWER
Another power measurement (MAXIMUM INSTANTANEOUS OUTPUT POWER) was proposed by IEC in 1988 (IEC publication 268-3 subclause 19.A).
We give here only a brief extract of the concept,
and a circuit useful for the measurement.
The supply voltage is set at the maximum operating value.
The test signal consists of a sinusoidal signal
whose frequency is 20 Hz, to which are added alternate positive and negative pulses of 50 µs duration 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.
TDA2050
A circuit for generating the test signal is given in
fig. 19.
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 impedance is of the order of 1 ohm, and a high output current is produced.
Using this signal and load network the measurement may be made without causing excessive
dissipation in the amplifier. The dissipation in the
1 ohm resistor is much lower than a rated output
power of the amplifier, because the duty-cycle of
the high output current is low.
By feeding the amplifier output voltage to the Xplates of an oscilloscope, and the voltage across
the 1 ohm resistor (representing the output current) to the Y=plates, it is possible to read on the
display the value of the maximum instantaneous
output power.
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
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
12/13
TDA2050
Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 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.
The ST logo is a registered trademark of STMicroelectronics
© 2002 STMicroelectronics – Printed in Italy – All Rights Reserved
PENTAWATT® is a Registered Trademark of SGS-THOMSON Microelectronics
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.
http://www.st.com
13/13
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement