TDA7057AQ/N2,112

Overview

The TDA7057AQ is a stereo BTL audio output amplifier manufactured by NXP Semiconductors, designed for integration into televisions, monitors, and battery-powered portable recorders. It features integrated DC volume control stages that eliminate the need for external coupling capacitors while maintaining low offset voltage. The device delivers up to 8 W of output power at 15 V supply with an 8 Ω load. Key electrical characteristics include a fixed maximum gain of 40.5 dB, a total harmonic distortion of 0.3% typical, and a quiescent current of 22 mA typical. It operates within a supply voltage range of 4.5 V to 18 V.

Feature Summary

• Integrated DC volume control stages allow for logarithmic gain adjustment without external coupling capacitors.
• Built-in Missing Current Limiter (MCL) protection activates when output current differences exceed specified thresholds.
• Thermal protection circuit reduces gain and output power if junction temperature exceeds safe operating limits.
• Short-circuit proof design protects against faults to ground, supply voltage, and across the load.

Applications

• Televisions and video monitors requiring compact audio amplification solutions.
• Battery-fed portable recorders benefiting from low power consumption and reduced component count.
• Portable radios where space constraints necessitate few external components.
• Consumer audio equipment utilizing BTL topology for higher output power efficiency.

Procurement Notes

Verify the specific ordering suffix and package variant when sourcing this component. Confirm that the received datasheet matches the official NXP specification document number and revision date. Ensure compatibility with existing thermal management designs, as performance depends on proper heatsinking under high dissipation conditions.

Selection Notes

Select this amplifier for applications requiring stereo BTL output with direct DC volume control integration. Consider the 13-lead plastic DIL-bent-SIL power package for mounting requirements. Evaluate thermal resistance calculations based on ambient temperature and expected sine wave power dissipation to ensure reliable operation within the specified junction temperature limits.

Part Context

This component belongs to the TDA7057 series of audio amplifiers produced by Philips Semiconductors, now NXP. It serves as a specialized solution for consumer electronics where space and component count are critical constraints. The device represents a mature technology designed for robust performance in standard television and radio chassis architectures.

Replacement Considerations

Consult official manufacturer documentation for confirmed substitute part numbers. Verify pinout compatibility and thermal characteristics before substituting any alternative devices.

FAQ

How does the MCL protection circuit function?

The Missing Current Limiter (MCL) activates when the current difference between the output terminals of each amplifier exceeds 100 mA, allowing for single-ended headphone applications while protecting against short circuits.

What is the effect of high junction temperature on performance?

At junction temperatures above 125 °C, the voltage gain decreases if it is higher than 0 dB, resulting in reduced output voltage and increased distortion levels.