TDA8953J/N1,112

Overview

The TDA8953J/N1,112 is a stereo or mono high-efficiency Class D audio power amplifier by NXP USA Inc. It delivers up to 2 × 210 W into a 4 Ω load in stereo single-ended mode, or 1 × 420 W into an 8 Ω load in mono bridge-tied load configuration. The device operates over a wide supply voltage range from ±12.5 V to ±42.5 V with low quiescent current consumption. It features advanced protection strategies including thermal foldback, overcurrent limiting, and window protection.

Feature Summary

• High output power capability with approximately 93% efficiency
• Stereo full differential inputs supporting SE or BTL configurations
• Smooth pop noise-free start-up and switch-off via controlled mode transitions
• Advanced protection strategy including thermal foldback and short-circuit proof outputs

Applications

• DVD systems
• Home Theater In A Box (HTIAB) systems
• Mini and micro receivers
• High-power speaker systems
• Public Address (PA) systems

Procurement Notes

Verify the specific ordering suffix and package variant against the official NXP datasheet before procurement. Confirm that the component meets all required electrical specifications for the intended application environment. Check for any end-of-life notices or alternative part recommendations from the manufacturer.

Selection Notes

Select this amplifier for applications requiring high power density and efficiency. Ensure the heat sinking design accounts for the thermal resistance characteristics. Verify that the supply voltage range matches the system requirements. Consider the fixed gain settings for input signal levels.

Part Context

This component belongs to the TDA8953 series of Class D audio amplifiers. It is designed for high-performance audio applications where size and efficiency are critical. The DBS23P package provides robust thermal performance for high-power outputs.

Replacement Considerations

Consult the official NXP documentation for confirmed substitute part numbers. Ensure any replacement maintains compatibility with the existing PCB layout and thermal management design.

FAQ

How is the carrier frequency determined?

The carrier frequency is set by an external resistor connected between the OSC and OSCREF pins, typically resulting in a frequency between 250 kHz and 450 kHz.

What happens if the junction temperature exceeds the thermal foldback threshold?

The amplifier gain is gradually reduced to lower the output signal amplitude and power dissipation, stabilizing the temperature until it falls below the activation threshold.