TDA7056A/N2,112

Overview

The TDA7056A is a mono bridge-tied load (BTL) audio output amplifier featuring integrated DC volume control, manufactured by NXP Semiconductors. Designed for TV and monitor applications as well as battery-fed portable recorders and radios, it operates within a supply voltage range of 4.5 V to 18 V. The device delivers up to 3.5 W of output power into a 16 Ω load at 12 V. It incorporates missing current limiter protection, thermal shutdown, and short-circuit proofing. The amplifier utilizes a 9-lead plastic single-in-line medium power package with a fin for heat dissipation.

Feature Summary

• Integrated DC volume control stage eliminates the need for external coupling capacitors while maintaining low offset voltage.
• Built-in Missing Current Limiter (MCL) protects against excessive current differences between output terminals.
• Bridge-tied load (BTL) architecture reduces peak supply current and doubles ripple frequency for cost-effective power supply design.
• Comprehensive protection features include thermal shutdown, short-circuit proofing to ground and supply, and mute mode functionality.

Applications

• Television sets and video monitors
• Battery-fed portable recorders
• Portable radio receivers
• Headphone amplifiers utilizing single-ended configuration

Procurement Notes

Verify the specific ordering suffix and material code against the manufacturer's latest documentation to ensure compatibility with required package standards. Confirm product status and availability directly with NXP Semiconductors or authorized distributors, as manufacturing statuses may change over time.

Selection Notes

Select this component for designs requiring a compact mono audio solution with integrated volume adjustment. The BTL topology is suitable for maximizing output power from lower supply voltages in portable devices. Ensure the application environment stays within the specified operating temperature range and that adequate thermal management is provided for the SIP package.

Part Context

The TDA7056A belongs to the TDA705x series of audio amplifiers developed by Philips Semiconductors, now NXP Semiconductors. This series focuses on providing efficient audio output stages with minimal external component counts. The TDA7056A specifically addresses the need for DC volume control integration, distinguishing it from earlier AC-coupled designs in the family.

Replacement Considerations

Consult official NXP documentation for confirmed substitute part numbers. Cross-referencing should be performed carefully to ensure pinout compatibility and electrical specifications match the original design requirements.

FAQ

How does the Missing Current Limiter (MCL) function?

The MCL circuit activates when the current difference between the output terminals exceeds 100 mA typically, allowing for safe operation in headphone applications using a single-ended configuration.

What is the gain control range of the DC volume control?

The total gain can be controlled from a maximum of 35.5 dB down to -44 dB. If the DC volume control voltage falls below 0.3 V, the device switches to mute mode.