HFDA801H-VYT

Overview

The HFDA801H-VYT is a fully digital Class-D audio amplifier from STMicroelectronics, housed in a 64-LQFP-EP (10x10 mm) package. It features an integrated 24-bit 120 dB DAC and supports I²S/TDM digital inputs up to 16 channels. The device operates on a wide supply voltage range of 4.5 V to 25 V, with a minimum of 5 V during turn-on transitions. It utilizes a 2 MHz PWM switching frequency to minimize external LC filter size. Key electrical specifications include typical output powers of 4 x 30 W at 4 Ω/14.4 V (10% THD), 4 x 25 W at 4 Ω/14.4 V (1% THD), and 4 x 80 W at 4 Ω/25 V (10% THD). It offers extremely low noise (13 µV A-weighted) and very low THD (0.02% at 1 W/1 kHz).

Feature Summary

• Integrated 120 dB D/A conversion with selectable input sample rates.
• Advanced diagnostic matrix including real-time current monitoring and open load detection.
• Flexible channel parallelization for driving 1 Ω loads.
• Battery load dump compatibility up to 40 V.

Applications

• Automotive front/rear speaker amplification
• Sub-woofer applications using 2.1 configuration
• High-resolution bandwidth audio systems

Procurement Notes

Verify the specific suffix 'H' against official ST documentation, as the provided datasheet references the 'A' variant. Confirm availability through authorized distributors. Ensure ESD handling protocols are followed due to the sensitivity of the CMOS components. Check for RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this component for designs requiring high integration and advanced diagnostics in automotive environments. The 2 MHz switching frequency reduces passive component costs. Consider the LQFP64 package constraints for thermal management. Ensure the host system supports I²S or TDM interfaces for digital control.

Part Context

This part belongs to the HFDA series of digital Class-D amplifiers designed for automotive use. It is AEC-Q100 qualified, ensuring reliability under automotive conditions. The series emphasizes high-fidelity audio performance combined with robust system protection features.

Replacement Considerations

The HFDA801A is the primary documented equivalent in the provided datasheet. Verify pinout and software compatibility before substitution. Other HFDA variants may differ in channel count or power output.

FAQ

What is the maximum transient supply voltage?

The absolute maximum rating for transient supply voltage is 40 V for a duration of 100 ms.

How does the feedback topology affect performance?

The LC filter is included in the feedback loop, making the amplifier insensitive to filter non-linearity and optimizing THD across various load conditions.

Can the channels be paralleled?

Yes, channels can be paralleled to drive lower impedance loads, such as 1 Ω, with one channel acting as Master and the other as Slave.