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%, V
S
=
18V, f = 1KHz and up to 32W into
8ohm load @ THD = 10%, V
S
=
22V, f = 1KHz.
Moreover, the TDA 2050 delivers typically 50W
music power into 4 ohm load over 1 sec at V
S
=
22.5V, f = 1KHz.
The high power and very low harmonic and cross-
over distortion (THD = 0.05% typ, @ V
S
=
22V,
P
O
= 0.1 to 15W, R
L
=8ohm, f = 100Hz to 15KHz)
make the device most suitable for both HiFi and
high class TV sets.
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
March 1995
TEST AND APPLICATION CIRCUIT
Pentawatt
ORDERING NUMBERS: TDA2050V
TDA2050H
1/13
SCHEMATIC DIAGRAM
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 T
CASE
= 75
C
25
W
T
stg
, T
j
Storage and Junction Temperature
-40 to 150
C
THERMAL DATA
Symbol
Description
Value
Unit
R
th j-case
Thermal Resistance junction-case
Max
3
C/W
PIN CONNECTION (Top view)
TDA2050
2/13
ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit, V
S
=
18V, T
amb
= 25
C, f = 1 kHz; un-
less otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage Range
4.5
25
V
I
d
Quiescent Drain Current
V
S
=
4.5V
V
S
=
25V
30
55
50
90
mA
mA
I
b
Input Bias Current
V
S
=
22V
0.1
0.5
A
V
OS
Input Offset Voltage
V
S
=
22V
15
mV
I
OS
Input Offset Current
V
S
=
22V
200
nA
P
O
RMS Output Power
d = 0.5%
R
L
= 4
R
L
= 8
V
S
=
22V R
L
= 8
24
22
28
18
25
W
W
W
d = 10%
R
L
= 4
R
L
= 8
V
S
=
22V R
L
= 8
35
22
32
W
W
W
Music Power
IEC268.3 RULES
d = 10%; T = 1s
V
S
=
22.5V; R
L
= 4
50
W
d
Total Harmonic Distortion
R
L
= 4
f = 1kHz, P
O
= 0.1 to 24W
f = 100Hz to 10kHz, P
O
= 0.1 to 18W
0.03
0.5
0.5
%
%
V
S
=
22V R
L
= 8
f = 1kHz, P
O
= 0.1 to 20W
f = 100Hz to 10kHz, P
O
= 0.1 to 15W
0.02
0.5
%
%
SR
Slew Rate
5
8
V/
s
G
V
Open Loop Voltage Gain
80
dB
G
V
Closed Loop Voltage Gain
30
30.5
31
dB
BW
Power Bandwidth (-3dB)
R
L
= 4
V
i
= 200mV
20 to 80,000
Hz
e
N
Total Input Noise
curve A
B = 22Hz to 22kHz
4
5
10
V
V
R
i
Input Resistance (pin 1)
500
k
SVR
Supply Voltage Rejection
R
s
= 22k
; f = 100Hz;
V
ripple
= 0.5Vrms
45
dB
Efficiency
P
O
= 28W; R
L
= 4
65
%
P
O
= 25W; R
L
= 8
;
V
S
=
22V
67
%
T
sd- j
Thermal Shut-down
Junction Temperature
150
C
TDA2050
3/13
Figure 1: Split Supply Typical Application Circuit
R3
R2
R1
C2
C4
C3
R4
C5
C6
C1
C7
+V s
R
L
-Vs
TDA 20 5 0
Vi
Figure 2: P.C. Board and Components Layout of the Circuit of Fig. 1 (1:1)
TDA2050
4/13
SPLIT SUPPLY APPLICATION SUGGESTIONS
The recommended values of the external compo-
nents are those shown on the application circuit
of fig. 2. Different values can be used. The follow-
ing table can help the designer.
Component
Recommended
Value
Purpose
Larger than
Recommended Value
Smaller than
Recommended Value
R1
22k
Input Impedance
Increase of Input
Impedance
Decrease of Input
Impedance
R2
680
Feedback Resistor
Decrease of Gain (*)
Increase of Gain
R3
22k
Increase of Gain
Decrease of Gain (*)
R4
2.2
Frequency Stability
Danger of Oscillations
C1
1
F
Input Decoupling DC
Higher Low-frequency
cut-off
C2
22
F
Inverting Input
DC Decoupling
Increase of Switch
ON/OFF Noise
Higher Low-frequency
cut-off
C3
C4
100nF
Supply Voltage Bypass
Danger of Oscillations
C5
C6
220
F
Supply Voltage Bypass
Danger of Oscillations
C7
0.47
F
Frequency Stability
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.
TDA2050
5/13
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