会社ブログについて Mingjiada Supply TI TPA6304 4-Channel Automotive Class-D Burr-Brown™ Audio Amplifier

Mingjiada Supply TI TPA6304 4-Channel Automotive Class-D Burr-Brown™ Audio Amplifier

Against the backdrop of rising penetration rates for new energy vehicles and the trend towards multi-channel audio systems in smart cockpits, automotive power amplifier chips are evolving from mere ‘power amplification’ towards ‘high efficiency, compact size and diagnostic capabilities’. Texas Instruments’ (TI) TPA6304-Q1, with a switching frequency of 2.1 MHz, four-channel output of 45 W (at 2 Ω load) and AEC-Q100 certification, has become a popular choice for entry-level car audio head units and external amplifier modules. Mingjiada Electronics has long supplied the TI TPA6304 series of automotive-grade Class D audio amplifiers, providing component supply and selection support for in-vehicle audio projects.

Product Overview
The TI TPA6304 (TPA6304-Q1) is an automotive-grade Class D audio amplifier launched by TI, utilising Burr-Brown™ audio technology and designed for applications such as in-car audio head units, external audio amplifiers and in-vehicle infotainment systems. The device offers 45W-class output capability, with specific output power varying according to supply voltage, load impedance and THD conditions. Its fixed switching frequency of 2.1 MHz helps to avoid the AM radio band and simplifies the design and layout of the output filter. The device meets automotive-grade requirements and is suitable for operation in the complex electrical environment of a vehicle.

TPA6304 Key Specifications:
Type: Class D
Output Type: 4-channel
Maximum output power per channel under various load conditions: 55 W × 4 @ 4 Ω
Supply Voltage: 4.5V to 18V
Mounting Type: Surface-mount
Operating Temperature: -40°C to 125°C (TA)
Supplier Device Package: 44-HTSSOP
Package/Housing: 44-PowerTSSOP (0.244", 6.20mm wide)

TI TPA6304 Automotive-Grade Class D Audio Amplifier: 45W, 2.1MHz and Burr-Brown™ Sound Quality Analysis
1. Why 2.1 MHz? Shifting the switching frequency above the AM band
Traditional Class D amplifiers typically set the PWM switching frequency to several hundred kHz; this band partially overlaps with the medium-wave AM band (530–1710 kHz), making it prone to causing audible interference in radios. The TPA6304-Q1 sets the switching frequency at 2.1 MHz, which is above the upper limit of the AM band, thereby avoiding interference at source. At the same time, this higher frequency allows for the use of smaller output filter inductors, directly reducing BOM size and cost.
2. Efficiency and Thermal Management: 75 per cent less heat dissipation than Class AB
The switching operation of the Class D topology results in significantly higher efficiency than linear Class AB designs. Official comparison data for the TPA6304-Q1 indicates a 75 per cent reduction in heat dissipation, meaning heat sinks can be eliminated or significantly reduced in size. For electric vehicles, this translates to lower background noise in the passenger compartment; as amplifier heat generation is directly linked to driving range and thermal management pressures, the value of high efficiency extends beyond mere cost savings.
3. Automotive-grade reliability: 40V load dump and start-stop low-voltage conditions
The TPA6304-Q1 is specifically designed to address the two major ‘killers’ of automotive electronics—load dump and start-stop voltage drops:
40V load dump protection, eliminating the need for expensive external load dump suppression circuits;
A wide supply voltage range of 4.5V to 18V, ensuring full operation down to 4.5V during start-stop cycles;
Compliant with AEC-Q100 Temperature Grade 1 (-40°C to 125°C), HBM ESD Grade 2 and CDM Grade C2B;
The suite of protection features also includes output short-circuit, DC offset, over-temperature, accidental ground open and power supply open-circuit protection.

Typical Applications
The TPA6304 series is suitable for in-car audio head units, external power amplifiers, in-car infotainment systems, active noise control modules, and in-car communication and audible alert systems. In multi-channel audio architectures, this device can be used to drive speaker channels and, via a diagnostic interface, assist the system in fault detection and status monitoring. For audio designs requiring a balance of output power, EMI control and automotive-grade reliability, the TPA6304 offers a highly integrated amplification solution.

Availability Information
Shenzhen Mingjiada Electronics Co., Ltd. – a long-standing distributor of TI products – maintains a constant stock of the TPA6304 series automotive-grade Class D Burr-Brown™ audio amplifiers (TPA6304QDDVRQ1). This device features a 45W output capability and a switching frequency of 2.1MHz. Utilising Burr-Brown audio technology, it is suitable for in-vehicle audio and infotainment systems. Mingjiada Electronics supports both sample procurement and bulk supply. To confirm specific part numbers, stock levels and real-time prices, please contact Mingjiada Electronics directly for a quotation.
Company URL: https://www.integrated-ic.com/
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