High performance loudspeaker amplifier ICs for digital instrument clusters

High performance loudspeaker amplifier ICs for digital instrument clusters

New Products |
By Christoph Hammerschmidt

Technological innovations in the automotive sector such as autonomous driving and ADAS require a variety of acoustic signals, for example warning signals when leaving the lane or when encountering obstacles. Even audio output systems in instrument clusters use loudspeaker amplifiers that generate acoustic signals with an MCU instead of producing flasher sounds with relays or warning tones with electronic buzzers. Until now, however, it has been difficult to ensure safe and stable audio output at high volumes.

The BD783xxEFJ-M series is suitable for instrument clusters that require various acoustic signals at high volume, including warning signals, flasher sounds, welcome tones and voice output. A new type of overcurrent protection circuit provides protection against short circuits at the. In addition, the integrated thermal shutdown and the undervoltage lockout circuit provide reliable protection against malfunctions. The ICs enable stable voice output even under difficult conditions without impairing functionality.

High output power of 2.8 W with integrated overcurrent protection

With conventional overcurrent protection circuits, the maximum output power is limited because the switching threshold of the protection circuit must be set to a value that is lower than the maximum current of the loudspeaker amplifier. With the new overcurrent protection circuit from Rohm, on the other hand, the output does not have to be limited because the oscillation curve is not distorted even at high power. The D783xxEFJ-M series thus offers protection against overcurrent in the event of output short circuits. In the past, this was difficult to achieve in combination with high power.

High reliability in automotive applications

The BD783xxEFJ-M series is qualified according to AEC-Q100 and supports a maximum operating temperature of 105°C. The use of a power package reduces heat generation at high volumes. This enables stable audio output even under difficult conditions without compromising functionality. In addition to overcurrent protection, a thermal shutdown and an undervoltage lockout circuit are integrated. These prevent damage caused by unusual heat generation and unexpected pops/cracking noises in the event of battery failure.

Rohm’s BD783xxEFJ-M series loudspeaker operational amplifiers are installed on Cypress Semiconductor’s Traveo-S6J3360 MCU family evaluation board for automotive applications. This allows easy evaluation under conditions similar to real-world cases.

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