ROHM recently announced the AEC-Q100 qualified 2.8W output Class AB monaural speaker amplifiers the BD783xxEFJ-M series (BD78306EFJ-M, BD78310EFJ-M and BD78326EFJ-M) ideal for instrument clusters – used in vehicles equipped with autonomous driving and ADAS.
In recent years, technological innovations in the automotive field – such as autonomous driving and ADAS – make it necessary to generate a wider variety of sounds, such as warning alerts for lane departure and obstacle detection. As a result, even audio output systems in the instrument cluster are utilizing speaker amps to generate sound with an MCU, instead of relays and electronic buzzers that produce blinker and warning sounds. However, until now it was difficult to ensure safe, stable sound output at loud volumes.
ROHM developed the BD783xxEFJ-M series for vehicle clusters requiring various sound outputs at high volume, including warning sounds, turn signals, welcome tones, and voice guidance. Also, adopting a new type of over current protection (OCP) circuit provides protection against output shorts (damage due to accidental terminal contact) that was difficult to achieve in the past, making it possible to deliver high 2.8W output. Thermal shutdown and under voltage lock out (UVLO) are also built in to ensure high reliability protection against abnormal conditions.
What’s more, qualification under the automotive reliability standard AEC-Q100 and support for high temperature operation up to 105℃ enable stable voice output without compromising functionality even under severe conditions.
Going forward, ROHM will continue to contribute to greater safety and comfort by developing high quality, high reliability products for the automotive field where sound diversification is increasing.
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