ST EVAL-TDA7803A Manuale utente

Introduction

This note provides preliminary information about how to operate the boards offered to evaluate two components in FW27

package: TDA7803A and TDA7808.

This document describes how to use the evaluation board in order to check devices performance; for any other information and

deeper details please refer to the TDA7803A and TDA7808 datasheet (see Appendix A).

Evaluation board for TDA7803A and TDA7808 power amplifiers

UM2376

User manual

UM2376 - Rev 2 - August 2020

For further information contact your local STMicroelectronics sales office.

www.st.com

1Hardware description

1.1 Board description

Figure 1. EVAL-TDA7803A board Top view

UM2376

Hardware description

UM2376 - Rev 2 page 2/14

1.2 Application circuit

The basic application diagram is shown in Figure 2. A key components description and a suggestion about how to

choose the right components, are respectively shown in Table 1.

Figure 2. EVAL-TDA7803A application circuit

S CK

OUT RF / OUT3

OUT R R / OUT4

OUT LF / OUT1

OUT LR / OUT2

22µF

4.7µF

TAB

Vpull-up

Vcc 1 Vcc 2

14 17 16 25

47KΩ

21 18

DGND

AGND

CD/DIAG

S D2_4

S D1_3

0.22µF

2200µF

TDA7803A

TDA7808

I2S INP UT

I2C BUS DATA

CLK

V ST-BY

Note: • C3 and C4 capacitors must be SMD ceramic types.

• GND separations unnecessary if a dedicated ground layer is available at PCBoard level.

Table 1. EVAL-TDA7803A components description

Component

name

Recomm.

value

Min/Max

value Purpose Lower than

recomm.

Higher than

recomm. Notes

C1 0.1 μF 0.1 μF/0.47

μF ± 20% Vbatt HF filter

Danger of high

frequency

instabilities

Lower HF

suppression

low-ESR type (e.g.

X7R). Placed very

close to the IC

C2 2200 μF 1000 μF min Vbatt LF filte Higher ripple

Audio

performance

improvment

Standard electrolytic/

25 V. Reasonably

close to the IC

C3 4.7 μF 2.2 μF/10 μF

± 20%

Supply filter of

the IC's digital

section

instability dysfunction low-ESR type (e.g.

X7R)

C4 22 μF 10 μF/47 μF

Supply filter of

the IC's analog

section

instability dysfunction low-ESR type (e.g.

X7R)

R2 47 KΩ 10 KΩ/75 KΩ CD/DIAG pull-up dysfunction dysfunction -

UM2376

Application circuit

UM2376 - Rev 2 page 3/14

2Board operation

Before any operation, please insert the power amplifier in the socket provided with the board.

A heat-sink (not provided) has to be used. Please refer to Section 3 Power dissipation/Heat-sink to choose the

right heat-sink.

A supply voltage (battery voltage or equivalent) on VS-GND connectors, between 6 V and 18 V, is needed to

operate the board.

Please refer to datasheet to understand load impedance compatibility of power amplifiers, then connect resistive

loads (or speakers) to OUT1, OUT2, OUT3, OUT4 connectors.

I2S format (SDA, CLK, WS lines) has to be used for input audio signals.

I2C bus format (SDA, CLK lines) is necessary for sending any operation instructions to the IC.

HW Mute and Standby should be disabled (both are active low).

The TDA7803A power amplifier can only operate with I2C bus active.

The IC can work in high efficiency mode too (please, refer to datasheet). This operating mode can be selected

through the I2C bus.

UM2376

Board operation

UM2376 - Rev 2 page 4/14

3Power dissipation/Heat-sink

The heat-sink size / characteristics largely depend on the operating conditions and consequently power

dissipation levels are implied. Dissipation can be higher if sine test tones are used instead of music or audio-

simulation signals (e.g. Pink Noise).

Considering the standard car-radio conditions (Vs = 14 V, RL = 4 Ω, 4-CH operation), the Pdiss levels implied are

as follows (STD mode / SB-I mode @ Tamb = 70 °C , Tj-max = 150 °C):

• SINE WAVE: Pdiss = 42 W / 38 Rth htsk = 1.9 °C/W / 2.1 °C/W

• PINK NOISE: Pdiss = 30 W / 18 Rth htsk = 12.7 °C/W / 4.4 °C/W

If sine-wave trials (especially with 4-CH operation / RL = 2 Ω) are to be run, then the heatsink

has to be replaced by a larger / lower-Rth one.

UM2376

Power dissipation/Heat-sink

UM2376 - Rev 2 page 5/14

4High frequency output waveforms

In SB-I mode the speaker signal (OUT-OUT) is the sum of the signals at OUT+ and OUT- pins, which are not

sinusoidal (in STD mode they are). Here below it is reported an oscilloscope snapshot, which shows the output

waveforms in SB-I mode (@ Po > 2.5 W / 4 Ω).

Figure 3. Output signals in high efficiency mode

UM2376

High frequency output waveforms

UM2376 - Rev 2 page 6/14

5Demo board schematic

Figure 4. EVAL-TDA7803A Demo board schematic

UM2376

Demo board schematic

UM2376 - Rev 2 page 7/14

6Information on board use

This evaluation board/kit is intended to be used for ENGINEERING DEVELOPMENT, DEMONSTRATION OR

EVALUATION PURPOSES ONLY and it is not considered by ST Microelectronics (ST) a finished end product fit

for general consumer use. People handling the product(s) must have electronics training and observe good

engineering practice standards. As such, the goods being provided are not intended to be complete in terms of

required design-, marketing- and/or manufacturing-related protective considerations, including product safety and

environmental measures typically found in end products that incorporate such semiconductor components or

circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding

electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore

they may not meet the technical requirements of these directives or other related directives.

UM2376

Information on board use

UM2376 - Rev 2 page 8/14

Appendix A Reference documents

Table 2. Reference documents

Doc Name ID Title

DS12195 030745 High efficiency digital input automotive quad power amplifier with built-in diagnostics features, 'start stop'

compatible

DS12230 030826 High efficiency digital input automotive quad power amplifier, 'start stop' compatible

UM2376

Reference documents

UM2376 - Rev 2 page 9/14

Revision history

Table 3. Document revision history

Date Version Changes

05-Apr-2018 1 Initial release.

05-Aug-2020 2 Removed PSO package.

UM2376

UM2376 - Rev 2 page 10/14

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