AN3956 Datasheet, PDF (1/14 Pages) Freescale Semiconductor, Inc – DEMOAPEXSENSOR Usage Altitude Pressure EXperimental (APEX) Sensor Board

AN3956
Application note
5 W + 5 W dual BTL class-D audio amplifier demonstration board
based on the TDA7491LP
Introduction
The STEVAL-CCA029V1 is a demonstration board designed for the TDA7491LP dual BTL
class-D audio amplifier. This application note provides the board specifications and a quick-
start list for standalone operation. Also included are the schematic, printed circuit board
layout and bill of material.
Due to its high efficiency, the device assembled in the PSSO36 (slug-down) package is
capable of dissipating heat without any heatsink. Jumpers on the board allow the
configuration of the amplifier in order to verify all the features as single-ended or differential
inputs, fixed gain settings. Microswitches are also provided to enable the standby and mute
functions.
The main features of the TDA7491LP include:
■ 5 W +5 W continuous output power at THD =10%, R_L = 8 Ω, V_CC = 9 V
■ 5 W +5 W continuous output power at THD = 10%, R_L = 4 Ω, V_CC =6.5V
■ Wide-range, single-supply operation (5 V - 14 V)
■ High efficiency (η = 90%)
■ Four selectable, fixed gain settings (20 dB, 26 dB, 30 dB and 32 dB)
■ Differential inputs to minimize common-mode noise
■ Filterless operation
■ Standby and mute features
■ Short-circuit and thermal overload protections
■ Externally synchronizable
Figure 1. STEVAL-CCA029V1
September 2012
Doc ID 022034 Rev 1
1/14
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