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
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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
Configuration of demonstration board connectors AN2470
2 Configuration of demonstration board connectors
Table 1. Demonstration board connectors
Connectors Description
Cn1 Power connector (VCC and GND). Power supply voltage from 2.2 V to 5.5 V
Cn2 and Cn3 Input signal connector (GND and active input signal).
Cn4 Output signal connector (V
Standby control connector (GND, standby, V
Cn5
GND and standby puts U1 in standby mode. A short-circuit between V
and standby puts U1 in operation mode.
out1
and V
out2
)
). A short-circuit between
CC
Warning: When the power supply is applied through Cn1, DO NOT
invert the polarity because it will destroy the amplifier U1.
CC
4/9 Doc ID 12936 Rev 2
AN2470 Schematic diagram
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3 Schematic diagram
Figure 1. Schematic diagram of the TS4871 (DFN8)
Table 2. Component list for the demonstration board TS4871 (DFN)
Designation Quantity Description
C1 0 Unconnected, ceramic capacitors, 0603
C2 1 100 nF/16 V, ceramic capacitors, 0603
C3 0 Unconnected, ceramic capacitors, 0603
C4 1 1 µF/50 V, electrolytic capacitor
C5 1 100 nF/16 V, ceramic capacitors, 0603
C6 1 1 µF/50 V, electrolytic capacitor
Cn1 1 2-pin header 2.54 mm pitch
Cn2 1 2-pin header 2.54 mm pitch
Cn3 1 2-pin header 2.54 mm pitch
Cn4 1 2-pin header 2.54 mm pitch
Cn5 1 3-pin header 2.54 mm pitch
J1 1 Jumper, 2.54 mm pitch
R1 1 22 k, 1/16 W 1% resistor, 0603
R2 1 22 k, 1/16 W 1% resistor, 0603
R3 0 Unconnected, 1/16 W 1% resistor, 0603
Doc ID 12936 Rev 2 5/9
Schematic diagram AN2470
Table 2. Component list for the demonstration board TS4871 (DFN) (continued)
Designation Quantity Description
R4 1 0R, 1/16 W 1% resistor, 0603
U1 1 TS4871IQ (DFN8 package)
6/9 Doc ID 12936 Rev 2
AN2470 Demonstration board layout
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4 Demonstration board layout
The following figures show the layers and the top view of the TS4871 demonstration board.
Figure 2. PCB top layer Figure 3. PCB bottom layer
Figure 4. Top view of demonstration board
Doc ID 12936 Rev 2 7/9
Revision history AN2470
5 Revision history
Table 3. Document revision history
Date Revision Changes
25-Jun-2009 1 Initial release
21-Mar-2012 2
– Changed: Figure 2, 3 and 4
– Minor text changes
8/9 Doc ID 12936 Rev 2
AN2470
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Doc ID 12936 Rev 2 9/9
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