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Features
■ High output power
(50 W music power IEC 268.3 rules)
■ High operating supply voltage (50 V)
■ 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
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
and up to 32 W into an 8 ohm load at THD = 10%,
V
= ±22 V, f = 1 kHz.
S
Moreover, the TDA2050 delivers typically 50 W
music power into a 4 ohm load over 1 sec at
V
= 22.5 V, f = 1 kHz.
S
= ±18 V, f = 1 kHz
S
TDA2050
32 W hi-fi audio power amplifier
Pentawatt V
The high power and very low harmonic and
crossover distortion (THD = 0.05% typ, at
V
= ±22 V, PO = 0.1 to 15 W, RL= 8 ohm,
S
f = 100 Hz to 15 kHz) make the device most
suitable for both hi-fi and high-end TV sets.
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
www.st.com
18
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Device overview TDA2050
1 Device overview
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
s
V
i
V
i
I
o
P
tot
T
, T
stg
Table 3. Thermal data
Symbol Parameter Value Unit
Supply voltage ±25 V
Input voltage V
s
Differential input voltage ±15 V
Output peak current (internally limited) 5 A
Power dissipation at T
Storage and junction temperature -40 to 150 °C
j
= 75 °C 25 W
CASE
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
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TDA2050 Device overview
The values given in the following table refer to the test circuit VS = ±18 V, T
= 25 °C,
amb
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
I
Quiescent drain current
d
I
Input bias current Vs = ± 22 0.1 0.5 µA
b
V
I
Input offset voltage Vs = ± 22 ± 15 mV
OS
Input offset current ± 200 nA
OS
Vs = ± 4.5
Vs = ± 25
d = 0.5%,
R
P
o
Output power
= 4 Ω
L
= 8 Ω
R
L
= ± 22 V, RL = 8 Ω
V
s
d = 10%,
= 4 Ω
R
L
= 8 Ω
R
L
24
22
Vs = ± 22 V, RL = 8 Ω
Music power IEC268.3 rules
d = 10%, T = 1s
R
= 4 Ω; Vs = ± 22.5 V
L
= 0.1 to 24W, RL = 4 Ω, f = 1 kHz
P
o
f = 100 to 10 kHz, Po = 0.1 to 18 W
30
5090mA
55
28
18
25
35
22
32
50 W
0.03
0.5
0.5%%
mA
W
W
W
W
W
W
d Distortion
Vs = ± 22 V, R
f = 1 kHz, Po = 0.1 to 20 W,
f = 100 Hz to 10 kHz;
= 0.1 to 15 W
P
o
= 8 Ω,
L
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
e
Input noise voltage
N
Input resistance (pin 1) 500 kΩ
R
i
SVR Supply voltage rejection
h Efficiency
T
Thermal shutdown junction
sd-j
temperature
= 200 mW, RL = 4 Ω; 20 to 80.000 Hz
i
B = Curve A
B = 22 Hz to 22 kHz
R
= 22 kΩ, f = 100 Hz;
g
V
= 0.5 V
ripple
P
= 28 W, RL = 4 Ω 65 %
o
= 25 W, RL = 8 Ω,Vs = ± 22 V, 67 %
P
o
RMS
4
510µVµV
45 dB
150 °C
Doc ID 1461 Rev 3 3/18
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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 Figure 5. Different values can be used. The following table can help the designer.
Table 5. Recommended values of external components
Component
R1 22 kΩ Input impedance
R2 680 Ω
R3 22 kΩ Increase of gain Decrease of gain
R4 2.2 Ω Frequency stability Danger of oscillations
C1 1 µF Input decoupling DC Higher low-frequency cutoff
C2 22 µF
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
Recommended
value
Purpose
Feedback resistor
Inverting input DC
decoupling
Larger than
recommended value
Increase of input
impedance
Decrease of gain
Increase of switch
ON/OFF noise
(1)
Smaller than
recommended value
Decrease of Input
Impedance
Increase of gain
(1)
Higher low-frequency cutoff
Doc ID 1461 Rev 3 5/18
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Split-supply application suggestions TDA2050
2.1 Printed circuit board
The layout shown in Figure 5 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.
Figure 6. Single-supply typical application circuit
Figure 7. PC board and component layout of single-supply typical application circuit
6/18 Doc ID 1461 Rev 3