ST TDA2050 User Manual

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

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

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

Device overview TDA2050

Figure 4. Split-supply typical application circuit

Figure 5. PC board and component layout of split-supply typical application circuit

TDA2050

L

R4

R3

R2

C2

R1

C4

C1

Vi

C7

C5

C3

C6

R

+Vs

-Vs

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 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

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