TDA7491LP

Overview

The TDA7491LP is a dual BTL Class-D audio amplifier designed for LCD TVs and monitors. It delivers 5W + 5W continuous output power at RL = 8 Ω, THD = 10%, VCC = 9V, or 5W + 5W at RL = 4 Ω, THD = 10%, VCC = 6.6V. Operating on a single supply voltage of 5V to 14V, it achieves high efficiency (η = 90%). The device features four selectable fixed gain settings: 20 dB, 26 dB, 30 dB, and 32 dB. It utilizes an exposed-pad-down PowerSSO-36 package, eliminating the need for a separate heatsink.

Feature Summary

• Filterless operation reduces external component count
• Differential inputs minimize common-mode noise
• No pop sound during turn-on/off transitions
• Supports standby and mute functions

Applications

• LCD televisions
• Computer monitors
• Compact audio systems requiring high efficiency

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors. Confirm package integrity upon receipt, as the PowerSSO-36 EPD requires proper soldering techniques. Check datasheet revisions for any updates regarding electrical characteristics or mechanical dimensions before finalizing design integration.

Selection Notes

Select this model when a lower power output solution than the TDA7491HV is required. It offers pin-to-pin compatibility with the TDA7491P and TDA7491HV series, facilitating design upgrades. Ensure the application voltage stays within the 5V to 14V range to maintain specified performance levels.

Part Context

Part of the TDA7491 family, which includes higher power variants like the TDA7491HV. Designed specifically for consumer electronics where space constraints and thermal management are critical. The EPD package allows direct heat dissipation through the PCB copper area.

Replacement Considerations

Pin-compatible substitutes include TDA7491P and TDA7491HV. Note that these alternatives offer different power output capabilities and may require adjustments in power supply design or thermal planning despite identical pinouts.