Delivers clear and powerful listening experiences

Geneva, Switzerland, September 23, 2024 – The STMicroelectronics HFA80A automotive-grade analog-input class-D audio amplifier combines high efficiency, small size, and a low bill of materials, with load diagnostics optimized for automotive and native electromagnetic compatibility (EMC).

With its feedback-before-filter topology and 2MHz nominal PWM frequency, the HFA80A lets designers optimize the output filter for the targeted performance and achieve a compact outline with small component values. Spread-spectrum operation simplifies meeting the mandatory CISPR 25 specification, with no additional EMC-specific filtering required.

The amplifier delivers clear and powerful listening experiences, driving up to 4x 49W into 2Ω speakers at 14.4V and with typical harmonic distortion (THD) specified at 0.015% (1W/4Ω). Pure sound is assured, with low output noise and crosstalk as well as 80dB power supply rejection specified at 1W/1kHz with 4Ω loads.

Flat frequency response up to 40kHz ensures generous bandwidth for high-resolution audio, which designers can extend to 80kHz by optimizing the filter. In addition, the HFA80A can handle performance-centric applications such as noise cancelling thanks to low latency by design.

The automotive-specific diagnostics is based on a specially conceived noise-immune algorithm capable of detecting anomalous load conditions and variations. Features include independent DC and AC load detection for each channel, detection of short-circuit on startup, and overcurrent protection with configurable thresholds. Further diagnostic checks include input-voltage DC-offset detection, output-current offset detection, and thermal protection with a choice of four different thermal warnings. 

A dedicated, configurable pin signals the host microcontroller when new diagnostic information is available, which simplifies host communications and relieves CPU workload. An I2C-bus interface provides access to the device features and diagnostic data, and a backup mode lets the amplifier continue operating even if I2C control is lost. In addition, the HFA80A features a digital admittance meter (DAM) that eases development by helping engineers check the connected speaker characteristics without external measurement tools or sensors.

The HFA80A is available now in a compact 7mm x 7mm LQFP48L thermally enhanced package with exposed pads, from $4.80 for orders of 1000 pieces.

Please visit www.st.com/hfa80a-class-d-audio-amp for more information.

About STMicroelectronics 

At ST, we are over 50,000 creators and makers of semiconductor technologies mastering the semiconductor supply chain with state-of-the-art manufacturing facilities. An integrated device manufacturer, we work with more than 200,000 customers and thousands of partners to design and build products, solutions, and ecosystems that address their challenges and opportunities, and the need to support a more sustainable world. Our technologies enable smarter mobility, more efficient power and energy management, and the wide-scale deployment of cloud-connected autonomous things. We are committed to achieving our goal to become carbon neutral on scope 1 and 2 and partially scope 3 by 2027. Further information can be found at www.st.com.