With conventional over current protection circuits, the maximum output is limited, since the operating threshold of the protection circuit must be set to a value smaller than the maximum current the speaker amp can provide. High 2.8W output with built-in over current protection.In addition to over current protection, built-in thermal shutdown and under voltage lock out (UVLO) ensures high reliability protection against abnormal conditions.įurthermore, satisfying the automotive reliability standard AEC-Q100 and having the capability of withstanding high temperature operation up to 105⁰C, enable stable voice output without compromising functionality even under severe conditions. Also, adopting a new type of over current protection (OCP) circuit provides protection against output shorts (damage due to accidental terminal contact) to deliver high 2.8W output that was difficult to achieve in the past. ROHM developed the BD783x圎FJ-M series for vehicle clusters - requiring various sound outputs at high volume, including warning sounds, turn signals, welcome tones and voice guidance. However, until now it was difficult to ensure safe, stable sound output at loud volumes. As a result, even audio output systems in the instrument cluster are utilizing speaker amps to generate sound with an MCU, instead of relays that produce blinker sounds and electronic buzzers that emit warning sounds. In recent years, technological innovations in the automotive field - such as autonomous driving and ADAS - require a greater variety of sounds, such as providing a warning sound during lane departure or detecting surrounding obstacles. ROHM recently announced the AEC-Q100 qualified 2.8W output Class AB monaural speaker amplifiers the BD783x圎FJ-M series (BD78306EFJ-M, BD78310EFJ-M and BD78326EFJ-M) designed for instrument clusters - used in vehicles equipped with autonomous driving and ADAS.Īpplication examples include automotive instrument clusters, vehicle emergency call systems, ADAS-related applications requiring voice functionality, and other applications requiring notification, warning and voice guidance output in vehicle environments.
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