ST AN2470 APPLICATION NOTE
AN2470
Application note
User guidelines for the low-voltage audio power amplifier
demonstration board based on the TS4871
Introduction
This document describes the STEVAL-CCA038V1 which is the demonstration board based
on the TS4871 low-power audio amplifier.
The micropackage DFN8 (dual flat no-lead 8-pin) is compact, saving board space and has
good thermal dissipation.
The BTL gain is set at 2 V/V and can be adapted if necessary by modifying the R1 or R2
values.
On the board, the R3 and C3 component locations are empty to allow the designer to modify
the input configuration from single-ended to differential mode. For differential mode, R4
must be modified.
The C1 component location is also empty in order to add a low-pass filter if required.
For more detailed information on calculating the component values, refer to the TS4871
datasheet.
March 2012 Doc ID 12936 Rev 2 1/9
www.st.com
Contents AN2470
Contents
1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Configuration of demonstration board connectors . . . . . . . . . . . . . . . . 4
3 Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Demonstration board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2/9 Doc ID 12936 Rev 2
AN2470 Features
1 Features
●
TS4871 low-voltage audio power amplifier with active-low standby mode
●
Operating range from V
●
1 W output power @ V
●
Ultra-low power consumption in standby mode (10 nA)
●
75 dB PSRR @ 217 Hz in grounded mode (Av = 2 V/V)
●
Near zero “pop and click”
●
Ultra-low distortion (0.1%)
●
Module gain set at 2 V/V
●
Thermal and short-circuit protection
= 2.2 V to 5.5 V
CC
= 5 V, THD=1%, F=1 kHz, with 8 Ω load
CC
Doc ID 12936 Rev 2 3/9
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