HFDA802-VYT

Overview

The HFDA802-VYT is a fully digital Class-D automotive audio amplifier by STMicroelectronics, housed in a 64-lead LQFP package with an exposed pad. It integrates a 24-bit DAC and supports I2S/TDM inputs up to 192 kHz. The device operates on a supply voltage of 4.5 V to 25 V (5 V minimum at turn-on). Key electrical parameters include typical output power of 2 x 30 W into 4 Ω at 14.4 V (10% THD) and 2 x 80 W into 4 Ω at 25 V (10% THD). It features extremely low noise (13 µV A-weighted) and very low THD (0.02% at 1 W, 1 kHz).

Feature Summary

• Integrates a 24-bit 120 dB D/A converter with selectable input sample rates.
• Features a 2 MHz switching PWM frequency for reduced LC filter size.
• Includes comprehensive I2C diagnostics such as thermal warnings and DC/AC load checks.
• Supports channel parallelization for driving lower impedance loads.

Applications

• Automotive audio amplifiers requiring high resolution bandwidth.
• Compact car radio designs utilizing BCD technology.
• Systems demanding advanced speaker control and robustness.

Procurement Notes

Verify the specific ordering suffix 'VYT' corresponds to the Tape & Reel packing format, distinct from the 'VYY' tray option. Confirm that the component meets AEC-Q100 qualification standards required for your automotive application. Ensure the design accommodates the LQFP64 exposed pad up package dimensions and thermal requirements specified in the datasheet.

Selection Notes

Select this component when high-fidelity audio performance is critical alongside extensive diagnostic capabilities. The integrated digital interface reduces external component count compared to analog alternatives. Consider the wide supply range and parallel channel options if driving low-impedance speakers or subwoofers. Verify compatibility with the system's I2S or TDM clocking architecture.

Part Context

The HFDA802 belongs to STMicroelectronics' FDA802 family of Class-D amplifiers designed for automotive use. This series utilizes advanced BCD technology to integrate digital signal processing with power outputs. The family includes variants like the FDA802S and FDA802P, offering different power levels and configurations while maintaining similar digital interface standards.

Replacement Considerations

The HFDA802-VYY is the tray-packed equivalent of the same functional device. Other family members include the FDA802A and FDA802AB, which offer higher power outputs but may differ in pinout or electrical specifications.

FAQ

What is the minimum supply voltage during the turn-on transition?

The minimum supply voltage level during the turn-on transition is 5 V.

How does the feedback topology affect performance?

The LC filter is included in the feedback loop, making the amplifier insensitive to demodulation filter non-linearity and ensuring stable phase margin across various load conditions.

Can the channels be paralleled?

Yes, the channels can be paralleled to drive a 1 Ω load, though this configuration is limited to 18 V.