TDA7851F

Overview

The TDA7851F is a Class-AB audio power amplifier utilizing Multipower BCD technology, designed for high-power car radio applications. It features a fully complementary P-Channel/N-Channel MOSFET output structure enabling rail-to-rail voltage swing. Key electrical parameters include a maximum output power of 4 x 48 W into 4 Ω and 4 x 72 W into 2 Ω. The device operates within a supply voltage range of 8 V to 18 V, with a minimum operating temperature of -55°C and a maximum of +150°C. Total Harmonic Distortion plus Noise (THD+N) is specified at 0.01%. It employs internally fixed gain of 26 dB, eliminating the need for external compensation or bootstrap capacitors.

Feature Summary

• High output power capability with excellent 2 Ω driving performance using MOSFET technology.
• Hi-Fi class distortion characteristics combined with low output noise levels.
• Integrated protection mechanisms including output short circuit, overtemperature soft limiter, load dump, reversed battery, and ESD protection.
• Low external component count due to internally fixed gain and absence of required external compensation or bootstrap capacitors.

Applications

• High-power automotive car radio systems
• In-vehicle infotainment audio amplification
• Automotive Class-AB audio power stages

Procurement Notes

Verify the specific suffix 'F' against the manufacturer's official datasheet to confirm package type and thermal specifications. Ensure compatibility with AEC-Q100 qualification requirements if used in automotive contexts. Confirm that the Flexiwatt-25 package matches the PCB footprint design. Check for any recent product lifecycle notices regarding obsolescence or alternative recommendations from STMicroelectronics before finalizing procurement.

Selection Notes

Select this component when designing for high-power automotive audio applications requiring robust MOSFET output stages. The internal fixed gain simplifies schematic design by removing external feedback components. Consider the wide operating temperature range and extensive protection features for harsh automotive environments. Verify that the 4-channel quad bridge configuration meets the speaker channel requirements of the target system.

Part Context

The TDA7851F belongs to STMicroelectronics' portfolio of automotive Class-AB audio power amplifiers. It utilizes Multipower BCD technology to achieve high efficiency and power density. This series is engineered specifically for the demanding constraints of vehicle infotainment systems, offering superior distortion performance compared to traditional bipolar technologies.

FAQ

Does the TDA7851F require external bootstrap capacitors?

No, the TDA7851F does not require external bootstrap capacitors, contributing to a lower external component count.

What is the maximum output power into a 2 Ω load?

The maximum output power capability is 4 x 72 W into a 2 Ω load.