InsideShowcase (Volume 23) is available in HTML and PDF format. - 319KB
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Plug-N-Play platform provides easy evaluation of all TI audio power amplifiers Texas Instruments is now offering designers an innovative way to evaluate audio power amplifiers. With the new Plug-n-Play concept, engineers can plug in various device modules and play them through the EVM platform to evaluate our entire line of audio power amplifiers. The Plug-N-Play Base Kit includes an evaluation platform, two 3 W speakers, audio input cable, speaker wire and data manual. The Plug-n-Play (PnP) platform is the heart of the kit, providing the interface to all modular EVMs, the stereo speakers and headphones, audio source and power supply. The platform has three dedicated sockets for testing either two mono audio power amplifiers or one stereo amplifier. There is also a socket for driving headphones, allowing the user to evaluate stereo speaker and headphone drive simultaneously. Provided is a "signal conditioning" section for the user to tailor the platform to their particular application or for use with the microphone/mixer EVM. The platform includes industry standard connectors for the speakers, headphones, power supply and audio source (CD, tape, etc.) making the system very flexible. For designers of battery powered applications, the platform includes a socket for a 9-V battery, which can be used with our high efficiency DC/DC converter EVM to produce either a 3.3 V or 5 V supply for low voltage audio power amplifiers. The PnP platform is compatible with all of TIs current audio power amplifier EVMs. The following modular EVMs are currently available:
TPA4861 A 1 W bridged-tied load (BTL) mono audio power amplifier. The TPA4861 provides high power supply rejection (56 dB) for increased fidelity, it is characterized at 3.3 V and 5 V operation and offers shutdown control. It is available in an 8-pin SOIC. TPA302 A 300 mW single-ended (SE) stereo audio power amplifier designed to drive headphones. The TPA302 requires only 5 mA (Max) of supply current. It offers shutdown control for extending battery life. TPA0102 Offers stereo speaker and headphone drive in a 24-pin TSSOP PowerPADTM package, replacing three chips in most designs. The device offers two BTL channels that can deliver 1.5 W into 4- TPA1517 It is a 6 W single-ended stereo audio power amplifier. It has a supply voltage range of 9.5 V to 18 V and a mute/standby mode for increasing life in battery powered systems. The TPA1517 is available in a 20-pin DIP and the 20-pin SOIC PowerPAD package. Two EVMs are available for the TPA1517, one in each package. DC/DC Converter A dc-dc buck converter which provides a 5 V or 3.3 V output at up to 2.5 A with an input voltage range of 5.5 V to 12 V. The PWM controller is a TL5001 operating at a nominal frequency of 275 kHz. The TL5001 is configured for a maximum duty cycle of 100% and has short circuit protection built-in. Microphone Mixer The microphone mixer module is designed to provide volume control and a microphone interface to the Plug-N-Play platform. The module uses a low noise TLC2274 quad CMOS rail-to-rail output op amp. All modules plug directly into the platform. No soldering is needed. This allows the designer to evaluate several different audio power amplifier products with minimal work. This significantly decreases preparation time and allows more time for actual evaluation. Plus, future TI audio power amplifiers will be compatible, allowing you to use this platform as a basis for easy evaluation in the future. To order any or all of the following:
Vol 23 August, 1997 |
. For applications where speakers are driven as BTL and the line outputs (often headphones) are required to be SE, the device automatically switches into SE mode delivery up to 500 mW of power. The TPA0102 also has an integrated MUX on board to allow two sets of stereo inputs to the amplifier.