ST TDA2040 User Manual

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Features

■ Wide-range supply voltage, up to 40 V

■ Single or split power supply

■ Short-circuit protection to ground

■ Thermal shutdown

■ P

= 25 W @ THD = 0.5%, VS = ±17 V, RL= 4 Ω

■ P

= 30 W @ THD =10%, VS = ±17 V, RL = 4 Ω

Description

The TDA2040 is a monolithic integrated circuit in the Pentawatt audio class-AB amplifier. Typically, it provides 25 W output power into 4 Ω with THD = 0.5% at V

= 34 V. The TDA2040 provides high output

current and has very low harmonic and crossover distortion. Furthermore, the device incorporates a patented short-circuit protection system

package, intended for use as an

TDA2040

25-watt hi-fi audio power amplifier

Datasheet − production data

Pentawatt V

comprising an arrangement for automatically limiting the dissipated power so as to keep the operating point of the output transistors within their safe operating range. A thermal shutdown system is also included.

Table 1. Device summary

Order code Package

TDA2040V Pentawatt V (vertical)

Figure 1. TDA2040 test circuit

July 2012 Doc ID 1460 Rev 6 1/16

This is information on a product in full production.

www.st.com

Pin connections TDA2040

1 Pin connections

Figure 2. Schematic diagram

Figure 3. Pin connections

2/16 Doc ID 1460 Rev 6

TDA2040 Electrical specifications

2 Electrical specifications

2.1 Absolute maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

Vs Supply voltage ±20 V

Vi Input voltage Vs

Vi Differential input voltage ±15 V

Io Output peak current (internally limited) 4 A

tot

, T

stg

ESD_HBM

Power dissipation at Tcase = 75 °C 25 W

Storage and junction temperature -40 to 150 °C

ESD maximum withstanding voltage range, test condition CDF-AEC-Q100-002- ”Human body

±1500 V

model”

2.2 Thermal data

Table 3. Thermal data

Symbol Parameter Min Typ Max Unit

th_j-case

Thermal resistance junction to case - - 3 °C/W

Doc ID 1460 Rev 6 3/16

Electrical specifications TDA2040

2.3 Electrical characteristics

The specifications given here were obtained with the conditions VS = ±16 V, T

amb

= 25 °C

unless otherwise specified.

Table 4. Electrical characteristics

Symbol Parameter Test conditions Min Typ Max Unit

BW Power bandwidth P

vOL

d Total harmonic distortion

SVRR Supply voltage rejection ratio

h Efficiency

Supply voltage - ±4.5 - ±20 V

Quiescent drain current

VS = ±4.5 V

= ±20 V

4530100mAmA

Input bias current VS = ±20 V - 0.3 1 μA

Input offset voltage VS = ±20 V - ±2 ±20 mV

Input offset current - - ±200 nA

Output power

d = 0.5%, f = 1 kHz, T

= 4 Ω

= 4 Ω, VS = ±17

RL = 8 Ω

RL = 4 Ω

= 4 Ω, VS = ±17

d = 10%, f = 1 kHz R

= 4 Ω, VS = ±17

= 1 W, RL = 4 Ω - 100 - Hz

amb

= 60 °C

20-22

25 12--

= 60 °C

15 1820-

Voltage gain (open loop) f = 1 kHz - 80 - dB

Voltage gain (closed loop) f = 1 kHz 29.5 30 30.5 dB

= 0.1 to 10 W, RL = 4 Ω,

Input noise voltage

Input noise current

f = 40 to 15000 Hz

= 0.1 to 10 W, RL = 4 Ω, f = 1 kHz - 0.03 - %

B = Curve A B = 22 Hz to 22 kHz

-0.08- %

5080-

200

Input resistance (pin 1) - 0.5 5 - MΩ

= 30 dB, RL = 4 Ω, Rg = 22 kΩ, f = 100 Hz

ripple

= 0.5 V RMS

40 50 - dB

f = 1 kHz

6663-

Thermal shutdown junction temperature

= 12 W, RL = 8 Ω

Po = 22 W, RL = 4 Ω

- - - 145 °C

Wd = 0.5%, f = 15 kHz; T

μV

4/16 Doc ID 1460 Rev 6

TDA2040 Electrical specifications

2.4 Characterizations

Figure 4. Output power vs. supply voltage Figure 5. Output power vs. supply voltage

Figure 6. Output power vs. supply voltage Figure 7. Distortion vs. frequency

Figure 8. SVRR vs. frequency Figure 9. SVRR vs. voltage gain

Doc ID 1460 Rev 6 5/16

Electrical specifications TDA2040

Figure 10. Quiescent drain current vs. supply

voltage

Figure 12. Power dissipation vs. output power

Figure 11. Open loop gain vs. frequency

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TDA2040 Applications

3 Applications

3.1 Circuits and PCB layout

Figure 13. Amplifier with split power supply

Figure 14. PCB and components layout for the circuit of the amplifier with split

power supply

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Applications TDA2040

Figure 15. Amplifier with single power supply

Note :

In this case of highly inductive loads protection diodes may be necessary.

Figure 16. PCB and components layout for the circuit of the amplifier with single

power supply

8/16 Doc ID 1460 Rev 6

TDA2040 Applications

Figure 17. 30-watt bridge amplifier with split power supply

Figure 18. PCB and components layout for the circuit of the 30-watt bridge amplifier

with split power supply

Doc ID 1460 Rev 6 9/16

Applications TDA2040

Figure 19. Two-way hi-fi system with active crossover

Figure 20. PCB and components layout for the circuit of the two-way hi-fi system

with active crossover

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TDA2040 Applications

3.2 Multiway speaker systems and active boxes

Multiway loudspeaker systems provide the best possible acoustic performance since each loudspeaker is specially designed and optimized to handle a limited range of frequencies. Commonly, these loudspeaker systems divide the audio spectrum into two, three or four bands.

Figure 21. Frequency response Figure 22. Power distribution vs. frequency

To maintain a flat frequency response over the hi-fi audio range the bands covered by each loudspeaker must overlap slightly. Any imbalance between the loudspeakers produces unacceptable results, therefore, it is important to ensure that each unit generates the correct amount of acoustic energy for its segment of the audio spectrum. In this respect it is also important to know the energy distribution of the music spectrum (see Figure 22) in order to determine the cutoff frequencies of the crossover filters. As an example, a 100-W three-way system with crossover frequencies of 400 Hz and 3 kHz would require 50 W for the woofer, 35 W for the midrange unit and 15 W for the tweeter.

Both active and passive filters can be used for crossovers but today active filters cost significantly less than a good passive filter using air-cored inductors and non-electrolytic capacitors. In addition, active filters do not suffer from the typical defects of passive filters:

● power loss

● increased impedance seen by the loudspeaker (lower damping)

● difficulty of precise design due to variable loudspeaker impedance

Obviously, active crossovers can only be used if a power amplifier is provided for each drive unit. This makes it particularly interesting and economically sound to use monolithic power amplifiers.

In some applications, complex filters are not really necessary and simple RC low-pass and high-pass networks (6 dB/octave) can be recommended. The results obtained are excellent because this is the best type of audio filter and the only one free from phase and transient distortion. The rather poor out-of-band attenuation of single RC filters means that the loudspeaker must operate linearly well beyond the crossover frequency to avoid distortion.

Doc ID 1460 Rev 6 11/16

Applications TDA2040

Figure 23. Active power filter

A more effective solution, named "Active Power Filter" by STMicroelectronics, is shown in

Figure 23. The proposed circuit can be realized by combined power amplifiers and

12-dB/octave or 18-dB/octave high-pass or low-pass filters.

The component values calculated for fc = 900Hz using a Bessel 3rd order Sallen and Key structure are:

C1 = C2 = C3 = 22 nF R1 = 8.2 kΩ R2 = 5.6 kΩ R3 = 33 kΩ

In the block diagram of Figure 24 is represented an active loudspeaker system completely realized using power integrated circuit, rather than the traditional discrete transistors on hybrids, very high quality is obtained by driving the audio spectrum into three bands using active crossovers (TDA2320A) and a separate amplifier and loudspeakers for each band. A modern subwoofer/midrange/tweeter solution is used.

Figure 24. High-power active loudspeaker system using TDA2030A and TDA2040

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TDA2040 Applications

3.3 Practical considerations

3.3.1 Printed circuit board

The layout shown in Figure 14 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.

3.3.2 Assembly suggestion

No electrical isolation is needed between the package and the heatsink with single supply voltage configuration.

3.3.3 Application suggestions

The recommended values of the components are those shown in the application circuit of

Figure 13. However, if different values are chosen then the following table can be helpful.

Table 5. Variations from recommended values

Component

R1 22 kΩ

R2 680 Ω

R3 22 kΩ

R4 4.7 Ω

C1 1 µF

C2 22 µF

C3, C4 0.1 µF

C5, C6 220μF

C7 0.1μF

1. The value of closed loop gain must be higher than 24 dB

Recommended

value

Purpose

Non-inverting input biasing

Closed-loop gain setting

Frequency stability

Input DC decoupling

Inverting DC decoupling

Supply voltage bypass

Frequency stability

recommended value

Increase in input impedance

Decrease in gain

Increase in gain Decrease in gain

Danger of oscillation at high frequencies with inductive loads

- Danger of oscillation

Larger than

(1)

Smaller than

recommended value

Decrease in input impedance

Increase in gain

(1)

Increase in low-frequency cut-off

Doc ID 1460 Rev 6 13/16

Package mechanical data TDA2040

4 Package mechanical data

Figure 25. Pentawatt V outline drawing

DIM.

A4.80 0.188 C1.370.054 D 2.40 2.80 0.094 0.11

D1 1.20 1.35 0.047 0.053

E0.35 0.55 0.014 0.022

E1 0.76 1.19 0.030 0.0 47

F0.80 1.05 0.031 0.041

F1 1.00 1.40 0.0390.055

G 3.20 3.40 3.60 0.126 0.1340.142 G1 6 .60 6.80 7.00 0.260 0.267 0.275 H2 10.40 0.41 H3 10.40

L 17.55 17.8518.15 0.691 0.703 0.715 L1 15.55 15.75 15.95 0.612 0.620 0.628 L2 21.2 21.4 21.6 0.8310.843 0.850 L3 22.3 22.5 22.7 0.878 0.8860.894 L4 1.29 0.051 L5 2.60 3.00 0.102 0.118 L6 15.10 15.80 0.594 0.622 L7 6.00 6.60 0.2360.260 L9 2.10 2.70 0.083 0.106

L10 4 .304.80 0.170 0.1 89

M4.23 4.5 4.75 0.167 0.178 0.1 M1 3.75 4.0 4.25 0.148 0.157 0.187 V4 40˚ (Typ.) V5 90˚ (Typ.)

DIA 3 .65 3.85 0.143 0.151

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

0.409

OUTLINE AND

MECHANICAL DATA

Weight: 2.00gr

Pentawatt V

L10

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK

packages, depending on their level of environmental compliance. ECOPACK®

is an ST trademark.

Dia.

RESIN BETWEEN

LEADS

GG1

PENTVME

0015981 F

14/16 Doc ID 1460 Rev 6

TDA2040 Revision history

5 Revision history

Table 6. Document revision history

Date Revision Changes

Apr-2003 3 Changes not recorded

Added features list on page 1

28-Oct-2010 4

16-Jun-2011 5

17-Jul-2012 6

Updated minimum supply voltage to ±4.5 V in Table 4 on page 4 Corrected the title of Figure 15 on page 8 Updated presentation

Removed minimum value from Pentawatt (vertical) package dimension H3 (Figure 25); minor textual changes.

Updated output power throughout datasheet (title, Features,

Description, Ta b le 4 ).

Doc ID 1460 Rev 6 15/16

TDA2040

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www.st.com

16/16 Doc ID 1460 Rev 6

ST TDA2040 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table 1. Device summary

Figure 1. TDA2040 test circuit

1 Pin connections

Figure 2. Schematic diagram

Figure 3. Pin connections

2 Electrical specifications

2.1 Absolute maximum ratings

Table 2. Absolute maximum ratings

2.2 Thermal data

Table 3. Thermal data

2.3 Electrical characteristics

Table 4. Electrical characteristics

2.4 Characterizations

Figure 12. Power dissipation vs. output power

Figure 11. Open loop gain vs. frequency

3 Applications

3.1 Circuits and PCB layout

Figure 13. Amplifier with split power supply

Figure 15. Amplifier with single power supply

Figure 17. 30-watt bridge amplifier with split power supply

Figure 19. Two-way hi-fi system with active crossover

3.2 Multiway speaker systems and active boxes

Figure 21. Frequency response Figure 22. Power distribution vs. frequency

Figure 23. Active power filter

Figure 24. High-power active loudspeaker system using TDA2030A and TDA2040

3.3 Practical considerations

3.3.1 Printed circuit board

3.3.2 Assembly suggestion

3.3.3 Application suggestions

Table 5. Variations from recommended values

4 Package mechanical data

Figure 25. Pentawatt V outline drawing

5 Revision history

Table 6. Document revision history