AN2470 Application note TS4871 low voltage audio power amplifier Evaluation board user guidelines Features Description

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Application note TS4871 low voltage audio power amplifier Evaluation board user guidelines Features TS4871 low voltage audio power amplifier with active low standby mode Operating range from V CC =2.2V to 5.5V 1W output power @ V CC =5V, THD=1%, F=1kHz, with 8Ω load Ultra low power consumption in standby mode (10nA) 75dB PSRR @ 217Hz in grounded mode (Av=2V/V) Near zero pop & click Ultra low distortion (0.1%) Module gain set at 2V/V Thermal and short-circuit protection Description DEMO TS4871 is an evaluation board designed for the TS4871 low power audio amplifier. The micropackage DFN8 (dual flat non leaded 8 pins) allows space saving and good thermal dissipation. The BTL gain is set at 2V/V and can be adapted if necessary with a modification of R1 or R2 values. On the board, the R3 and C3 component locations are empty to allow you to modify the input configuration from single-ended to differential. 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 about component calculation, refer to the TS4871 datasheet. December 2006 Rev 1 1/6 www.st.com

Evaluation board connector configuration AN2470 1 Evaluation board connector configuration Connectors Description Cn1 Cn2 and Cn3 Power connector (V CC and GND). Power supply voltage from 2.2V to 5.5V. Input signal connector (GND and active input signal). Cn4 Output signal connector (V out1 and V out2 ) Cn5 Standby control connector (GND, Standby, V CC ). A short-circuit between GND and Standby puts U1 in standby mode. A short-circuit between V CC and standby puts U1 in operation mode. Caution: When you apply power supply through Cn1, DO NOT invert the polarity because it would destroy the amplifier U1. 2/6

Schematic diagram 2 Schematic diagram Figure 1. Schematic diagram of the TS4871 DFN8 871 3/6

Schematic diagram AN2470 Table 1. Component list for the DEMO TS4871/DFN Designation Quantity Description C1 0 Unconnected, ceramic capacitors, 0603 C2 1 100nF/16V, ceramic capacitors, 0603 C3 0 Unconnected, ceramic capacitors, 0603 C4 1 1μF/50V, electrolytic capacitor C5 1 100nF/16V, ceramic capacitors, 0603 C6 1 1μF/50V, electrolytic capacitor Cn1 1 2 pins header 2.54mm pitch Cn2 1 2 pins header 2.54mm pitch Cn3 1 2 pins header 2.54mm pitch Cn4 1 2 pins header 2.54mm pitch Cn5 1 3 pins header 2.54mm pitch J1 1 Jumper, 2.54mm pitch R1 1 22k, 1/16W 1% resistor, 0603 R2 1 22k, 1/16W 1% resistor, 0603 R3 0 Unconnected, 1/16W 1% resistor, 0603 R4 1 0R, 1/16W 1% resistor, 0603 U1 1 TS4871IQ (DFN8 package) 4/6

Evaluation board layout 3 Evaluation board layout The following figures show the layers and the top view of the TS4871 demoboard. Figure 2. PCB top layer Figure 3. PCB bottom layer Figure 4. Top view of demoboard 871 5/6

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