TDA7056AT/N2,512

Overview

The TDA7056AT/N2,512 is a mono Bridge-Tied Load (BTL) audio amplifier manufactured by NXP Semiconductors. It features integrated DC volume control and operates within a supply voltage range of 4.5 V to 18 V. The device delivers an output power of 3 W into a 16 Ω load at 12 V supply. It utilizes a 20-lead SO20 plastic small outline package (SOT163-1). Key electrical characteristics include a maximum total voltage gain of 35.5 dB and a quiescent current of 8 mA typical at 12 V.

Feature Summary

• Integrated DC volume control eliminates the need for external coupling capacitors
• Bridge-Tied Load (BTL) architecture reduces peak supply current and ripple frequency
• Built-in thermal protection activates when junction temperature exceeds 150 °C
• Short-circuit proof design protects against ground, supply, and load shorts

Applications

• Television sets and monitor audio systems
• Battery-fed portable recorders
• Portable radio receivers
• Single-ended headphone applications with current limiting

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm RoHS compliance status as indicated in material declarations. Check product lifecycle status as manufacturing availability may vary. Ensure proper handling of ESD-sensitive pins during assembly.

Selection Notes

Select this component for designs requiring low external component count and integrated volume adjustment. Consider the SO20 package dimensions for PCB layout constraints. Evaluate thermal resistance requirements based on ambient temperature and copper area. Verify supply voltage compatibility within the 4.5 V to 18 V operating range.

Part Context

This part belongs to the TDA7056 series of audio amplifiers from NXP Semiconductors. It shares functional similarities with other BTL amplifiers in the family but offers specific integration of DC volume control. The AT suffix denotes the surface-mount SO20 package variant designed for automated assembly processes.

Replacement Considerations

Official substitute part numbers are not explicitly confirmed in the provided datasheet documentation. Cross-reference with TDA7056A or TDA7056B only if pinout and electrical specifications match exactly. Verify package compatibility and thermal performance before substitution.

FAQ

How does the Missing Current Limiter (MCL) function?

The MCL circuit activates when the current difference between output terminals exceeds 100 mA typically, allowing safe single-ended headphone operation while shutting off the amplifier during excessive current draw.

What causes switch-on clicks and how are they prevented?

Switch-on behavior depends on power supply rise time, input capacitor values, and source impedance. Using a capacitor greater than 0.1 μF on the DC volume control pin helps avoid disturbances and clicks.

What is the maximum voltage gain of the amplifier?

The maximum closed-loop voltage gain is internally fixed at 35.5 dB. The total gain can be controlled from +35.5 dB down to -44 dB using the DC volume control input.