TDA7491P

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	Class D
Output Type:	2-Channel (Stereo)
Max Output Power x Channels @ Load:	10W x 2 @ 6 Ohm
Voltage - Supply:	5 V ~ 18 V
Features:	Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection, Standby
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	PowerSSO-36 EPD
Package / Case:	36-BFSOP (0.295", 7.50mm Width) Exposed Pad
Base Part Number:	TDA7491

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Application Field

The TDA7491P is a high-performance integrated audio amplifier IC fabriacted in a single-chip form and is specifically designed for various audio applications. It is capable of driving stereo speakers at up to 40 Watts ( using a 12 Volts power source) and provides superb sound quality, excellent power efficiency and low distortion. Its features make it an ideal choice for many applications, such as car audio systems, home theater systems, portable audio devices, headphone amplifiers and other audio-visual devices. It can also be used in other audio applications such as communication systems, sound broadcasting, public address systems and display boards.

Features

The TDA7491P offers several features that make it ideal for use in audio applications:• High output power: The TDA7491P is capable of delivering up to 40 watts of continuous output power. It is capable of driving loudspeakers with a minimum load impedance of 4 ohms.• Low distortion: The device has a very low THD (Total Harmonic Distortion) of 0.1% at a power output of 2 Watts.• Low noise: The device has high SNR (Signal-to-Noise Ratio) of 90 dB, which ensures that the sound signal is reproduced without distortion and interference.• Low power consumption: The IC is designed to provide high efficiency and low power consumption.• Compact size: It is a single-pole IC, which is much smaller than many other audio amplifier IC’s.

Working Principle

The TDA7491P follows the standard BTL (bridge-tied-load) method of audio amplifier design. This involves connecting two audio signal inputs (positive and negative) to two independent amplifiers which are then connected, via matching resistors, to the loudspeaker output. This type of configuration is advantageous for driving low-amplitude audio signals in low power, low-noise systems as it allows for higher power output with less distortion. In the TDA7491P, the input signal is passed through the differential input stage, which consists of two combination transistors and two matching resistors. This allows the device to amplify both positive and negative signal components. The signal then passes through the output stage, which consists of four pairs of bifilar transforms and two pairs of single-ended, emitter coupled amplifiers ( each with a current mirror). The advantage of this stage is that it provides a great level of stability and high efficiency.Finally, the output signal is then passed to a voltage-sensing circuit. This circuit senses the output voltage and controls the output level by controlling the current through the output transistors. This ensures that the output voltage remains stable, allowing for higher sound pressure levels and less distortion.

Conclusion

The TDA7491P is a high-performance integrated audio amplifier IC designed for various audio applications. It has many features that make it ideal for many audio applications, such as car audio systems, home theater systems, portable audio devices, and headphone amplifiers. It follows the standard BTL method of audio amplifier design, making it capable of driving low-amplitude audio signals in low power, low-noise systems. It is capable of delivering up to 40 watts of continuous output power, has very low THD and high SNR, and is compact in size with low power consumption.

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