TDA7056B/N1,112

Overview

The TDA7056B is a mono Bridge-Tied Load (BTL) audio amplifier manufactured by NXP Semiconductors. It integrates DC volume control and requires few external components. The device operates on a supply voltage ranging from 4.5 V to 18 V. Output power reaches 3.5 W into a 16 Ω load and 5.5 W into an 8 Ω load at 12 V supply. Total quiescent current is typically 13 mA at 12 V. The maximum total voltage gain is 40.5 dB, with a gain control range of 68 dB. The package is a 9-lead SIL9MPF plastic single in-line medium power package.

Feature Summary

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

Applications

• Television sets and monitor systems.
• Battery-fed portable recorders.
• Portable radio receivers.
• Headphone applications utilizing the Missing Current Limiter.

Procurement Notes

Verify the specific ordering suffix and RoHS compliance status directly with NXP Semiconductors or authorized distributors. Confirm that the component meets the required environmental standards for the intended application before finalizing procurement decisions.

Selection Notes

Select this amplifier for designs requiring low component count and integrated volume control. Ensure the load impedance matches the 8 Ω or 16 Ω specifications for optimal power output. Verify that the supply voltage remains within the 4.5 V to 18 V operating range to maintain stability and performance.

Part Context

This component belongs to the TDA7056 series of audio amplifiers. It is designed as a general-purpose solution for consumer electronics where space and cost efficiency are priorities. The BTL configuration allows for higher output power compared to conventional single-ended stages under similar supply conditions.

Replacement Considerations

Consult official NXP documentation for confirmed substitute part numbers. No direct replacements are listed in the provided datasheet.

FAQ

How does the DC volume control function affect the input stage?

The DC volume control stage is integrated into the input stage, allowing for logarithmic gain control from 40.5 dB down to -33 dB without requiring external AC coupling capacitors.

What triggers the Mute mode in the TDA7056B?

The device switches to mute mode when the DC volume control voltage falls below 0.4 V, resulting in an output voltage of approximately -35 µV to 45 µV.

What is the purpose of the Missing Current Limiter (MCL)?

The MCL circuit activates when the current difference between the output terminals exceeds 100 mA, protecting the device during single-ended headphone applications or fault conditions.