CD00000131

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TDA2050
32 W hi-fi audio power amplifier
Features
High output power
(50 W music power IEC 268.3 rules)
â– 
High operating supply voltage (50 V)
â– 
Single or split supply operations
â– 
Very low distortion
â– 
Short-circuit protection (OUT to GND)
â– 
Pentawatt V
Thermal shutdown
â– 
The high power and very low harmonic and
crossover distortion (THD = 0.05% typ, at
V
S
= ±22 V, P
O
= 0.1 to 15 W, R
L
= 8 ohm,
f = 100 Hz to 15 kHz) make the device most
suitable for both hi-fi and high-end TV sets.
Description
The TDA 2050 is a monolithic integrated circuit in
a 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 35 W true RMS power into
a 4 ohm load at THD = 0%, V
S
= ±18 V, f = 1 kHz
and up to 32 W into an 8 ohm load at THD = 10%,
V
S
= ±22 V, f = 1 kHz.
Moreover, the TDA2050 delivers typically 50 W
music power into a 4 ohm load over 1 sec at
V
S
= 22.5 V, f = 1 kHz.
Table 1.
Device summary
Order code
Package
TDA2050V
Pentawatt vertical
Figure 1.
Test and application circuit
August 2011
Doc ID 1461 Rev 3
1/18
18
 Device overview
TDA2050
1
Device overview
Table 2.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
V
s
Supply voltage
±25
V
V
i
Input voltage
V
s
V
i
Differential input voltage
±15
V
I
o
Output peak current (internally limited)
5
A
P
tot
Power dissipation at T
CASE
= 75 °C
25
W
T
stg
, T
j
Storage and junction temperature
-40 to 150
°
C
Table 3.
Thermal data
Symbol
Parameter
Value
Unit
R
th j-case
Thermal resistance junction-case
3 (max)
°C
Figure 2.
Pin connections (top view)
Figure 3.
Schematic diagram
2/18
Doc ID 1461 Rev 3
TDA2050
Device overview
The values given in the following table refer to the test circuit V
S
= ±18 V, T
amb
= 25 °C,
f = 1 kHz, unless otherwise specified.
Table 4.
Electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
V
s
Supply voltage range
±
4.5
±
25
V
V
s
= ± 4.5
V
s
= ± 25
30
55
50
90
mA
mA
I
d
Quiescent drain current
I
b
Input bias current
V
s
= ± 22
0.1
0.5
µA
V
OS
Input offset voltage
V
s
= ± 22
±
15
mV
I
OS
Input offset current
±
200
nA
d = 0.5%,
R
L
= 4
Ω
R
L
= 8
Ω
V
s
= ± 22 V, R
L
= 8
Ω
24
28
18
25
W
W
W
22
Output power
d = 10%,
R
L
= 4
Ω
R
L
= 8
Ω
V
s
= ± 22 V, R
L
= 8
Ω
P
o
35
22
32
W
W
W
d = 10%, T = 1s
R
L
= 4
Ω;
Vs = ± 22.5 V
Music power IEC268.3 rules
50
W
P
o
= 0.1 to 24W, R
L
= 4
Ω
, f = 1 kHz
f = 100 to 10 kHz, Po = 0.1 to 18 W
0.5
0.5
%
%
0.03
Vs = ± 22 V, R
L
= 8
Ω
,
f = 1 kHz, Po = 0.1 to 20 W,
f = 100 Hz to 10 kHz;
P
o
= 0.1 to 15 W
d
Distortion
0.02
%
%
0.5
SR
Slew rate
5
8
V/µs
G
v
Voltage gain (open loop)
f = 1 kHz
80
dB
G
v
Voltage gain (closed loop)
f = 1 kHz
30
30.5
31
dB
BW
Power bandwidth (-3dB)
V
i
= 200 mW, R
L
= 4
Ω;
20 to 80.000
Hz
B = Curve A
B = 22 Hz to 22 kHz
4
5
µV
µV
e
N
Input noise voltage
10
R
i
Input resistance (pin 1)
500
k
Ω
R
g
= 22 k
Ω
, f = 100 Hz;
V
ripple
= 0.5 V
RMS
SVR
Supply voltage rejection
45
dB
P
o
= 28 W, R
L
= 4
Ω
65
%
h
Efficiency
P
o
= 25 W, R
L
= 8
Ω,
V
s
= ± 22 V,
67
%
Thermal shutdown junction
temperature
T
sd-j
150
°
C
Doc ID 1461 Rev 3
3/18
 Device overview
TDA2050
Figure 4.
Split-supply typical application circuit
Figure 5.
PC board and component layout of split-supply typical application circuit
TDA2050
R
L
R4
R3
+Vs
R2
C7
C5
C2
C3
R1
C4
C6
C1
-Vs
Vi
4/18
Doc ID 1461 Rev 3
   TDA2050
Split-supply application suggestions
2
Split-supply application suggestions
The recommended values of the external components are those shown on the application
circuit of
Different values can be used. The following table can help the designer.
Table 5.
Recommended values of external components
Recommended
value
Larger than
recommended value
Smaller than
recommended value
Component
Purpose
Increase of input
impedance
Decrease of Input
Impedance
R1
22 k
Ω
Input impedance
Decrease of gain
(1)
R2
680
Ω
Increase of gain
Feedback resistor
Decrease of gain
R3
22 k
Ω
Increase of gain
R4
2.2
Ω
Frequency stability
Danger of oscillations
C1
1 µF
Input decoupling DC
Higher low-frequency cutoff
Inverting input DC
decoupling
Increase of switch
ON/OFF noise
C2
22 µF
Higher low-frequency cutoff
C3, C4
100 nF
Supply voltage bypass
Danger of oscillation
C5, C6
220 µF
Supply voltage bypass
Danger of oscillation
C7
0.47 µF
Frequency stability
Danger of oscillation
1.
The gain must be higher than 24 dB
Doc ID 1461 Rev 3
5/18
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