Description:

The TPA6304-Q1 device is a four-channel analog-input Class-D Burr-Brown™ audio amplifier with a 2.1MHz PWM switching frequency that enables a cost-optimized solution with a very small PCB size of only 2.7cm², featuring high-impedance single-ended inputs and full operation down to 4.5V during start/stop. The TPA6304-Q1 Class-D audio amplifier is designed to excel in entry-level automotive audio head units, providing analog audio input signals as part of the system design. Compared with traditional linear amplifier solutions, Class-D topology technology significantly improves device efficiency. The output switching frequency can be set either above the AM band to eliminate AM band interference and reduce output filter size and cost, or below the AM band to further optimize efficiency. The device is available in a 44-pin HTSSOP package with an exposed thermal pad.

Features:

High-efficiency Class-D – Efficiency significantly higher than Class-AB – Improved thermal solution, 75% lower heat dissipation than Class-AB

Start/stop operation down to 4.5V

AEC-Q100 qualified for automotive applications: – Temperature grade 1: –40°C to 125°C TA – HBM ESD classification level 2 – CDM ESD classification level C2B

Output power of 27W with 10% THD at 4Ω load and 14.4V supply voltage – Drives 4Ω and 2Ω loads

Load diagnostic functions – Open and shorted output load – Output short to battery or short to ground – Connected tweeter

Advanced gate drive design to meet CISPR25-L5 EMC specifications – Class-D audio amplifier, 2.1MHz switching frequency, no AM interference – Spread-spectrum mode, phase offset, slew rate control

Protection features – 40V load dump protection – Output short-circuit protection – DC offset and over-temperature protection – Unexpected ground-open and supply-open protection

Audio inputs – Four-channel single-ended analog inputs – 10dB, 16dB, 22dB or 28dB gain options

Supports parallel channel drive (PBTL)

Audio performance at 4Ω load and 14.4V, 1kHz – THD+N < 0.006% – 42µVRMS output noise – 80dB PSRR – Efficiency > 80%

Features – Programmable clip detection – Load current limiter – Thermal gain and thermal foldback – Fast, automatic startup diagnostics – AC load impedance measurement at load current < 10mA

Applications:

Automotive audio head units

Automotive external amplifier modules