Audio amps maintain hi-fi sound during engine turn-off
Allowing in-car entertainment equipment to operate without interruption as the engine is turned off and restarted, the 4x50W TDA7850LV audio amplifier is offered as the first start/stop-compatible IC of its kind. The company also claims that this parts offers high quality audio and distortion performance.
In cars fitted with start/stop, the supply voltage for on-board electrical equipment can fall to as low as 6 V when the engine is turned off and restarted and only the battery is supplying electrical power. In addition, switching between battery power and alternator power can generate ‘pop and click’ noise. Left unaddressed, these effects can cause distortion in the audio system’s output.
Discrete components external to the audio power amplifier can be used to build circuitry to regulate the supply voltage and suppress pop and click noises. However, these circuits complicate design and add significantly to BOM costs. The TDA7850LV audio power amplifier makes the use of all these components unnecessary and therefore simplifies design, reduces cost, and saves pc-board space.
Features include: 4x50W MOSFET output stage, 2-Ω driving capability, and a 0.35-A high-side driver. Protection features include short circuits to ground and battery, open-circuited speakers, highly inductive loads, load-dump, over-temperature, and ESD. Datasheet: www.st.com/stonline/products/literature/bd/17720.pdf (From $5.30 ea/1,000 available now.)
STMicroelectronics
Lexington , MA
Information 781-861-2650
http://www.st.com
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