TPA2001D1PWR

Overview

The TPA2001D1 is a 1-W mono bridge-tied-load Class-D audio power amplifier designed for 8-Ω speakers. It utilizes a third-generation modulation scheme to operate without an output LC filter, achieving maximum efficiency of 75–85% into an 8-Ω load. The device delivers 1 W output power at 1 kHz with THD+N less than 1%. Supply current is 4 mA without a filter and 7.5 mA with one, while shutdown current is 0.05 µA. It features four internal gain settings (6, 12, 18, and 23.5 dB) controlled via GAIN0 and GAIN1 pins. PSRR is -77 dB at 5 V supply. The noise floor is 40 µV RMS without weighting. Operating voltage ranges from 2.7 V to 5.5 V.

Feature Summary

• Third-generation modulation scheme enables direct speaker connection without external LC output filters, reducing system size and EMI shielding requirements.
• Integrated depop circuitry minimizes turn-on pop noise during power-up and shutdown transitions.
• Four selectable internal gain levels allow flexible configuration for various input signal amplitudes.
• Comprehensive protection includes short-circuit protection against battery, ground, and load faults.

Applications

• Notebook personal computers
• Powered desktop speakers
• Portable battery-operated audio devices

Procurement Notes

Verify the specific ordering suffix to confirm packaging type. The 'R' suffix indicates tape and reel packaging, while the absence indicates tube packaging. Confirm the package variant matches the required PCB footprint. Ensure the temperature range meets the application environment. Check for RoHS compliance status in the latest datasheet revision.

Selection Notes

Select this component for applications requiring high efficiency in space-constrained designs where output filters are undesirable. The differential CMOS inputs simplify interface with standard audio sources. Consider the input impedance variation when designing the input coupling network. Ensure the speaker can handle the additional ripple current dissipation inherent in filterless operation.

Part Context

This device belongs to Texas Instruments' third-generation Class-D amplifier family. It represents an evolution in filterless audio amplification technology aimed at improving efficiency and reducing electromagnetic interference compared to traditional modulation schemes. The TSSOP package provides a compact solution for single-channel audio amplification needs.

Replacement Considerations

The TPA2005D1 is a related product within the same manufacturer's portfolio offering similar Class-D characteristics. Verify pin compatibility and electrical specifications before substitution. Review updated datasheets for any changes in performance metrics or recommended operating conditions.

FAQ

How is the amplifier gain configured?

Gain is set using two digital input terminals, GAIN0 and GAIN1. These TTL logic level inputs select one of four internal gain settings: 6, 12, 18, or 23.5 dB.

Why is an output filter not required?

The device uses a unique modulation scheme where outputs are in-phase with varying duty cycles. This reduces switching current flow through the load, minimizing I²R losses and allowing direct connection to the speaker without an LC filter.

What is the purpose of the SHUTDOWN pin?

The SHUTDOWN pin controls the operational state. A high logic level enables normal operation, while a low logic level places the amplifier in a low-current shutdown mode to conserve battery power.