LM4950TS

Series:	Boomer®
Packaging:	Tube
Part Status:	Active
Type:	Class AB
Output Type:	1-Channel (Mono) or 2-Channel (Stereo)
Max Output Power x Channels @ Load:	7.5W x 1 @ 8 Ohm; 3.1W x 2 @ 4 Ohm
Voltage - Supply:	9.6 V ~ 16 V
Features:	Depop, Short-Circuit and Thermal Protection, Shutdown
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	DDPAK/TO-263-9
Package / Case:	TO-263-10 (9 Leads + Tab)
Base Part Number:	LM4950

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LM4950TS Application Field and Working Principle

Audio amplifiers are electronic circuits that allow a low-power audio signal to be amplified to a level suitable for driving loudspeakers and headphones. Audio amplifier ICs, such as the LM4950TS, are becoming increasingly popular for driving small, tight-tolerance loudspeakers in mobile and other applications where low space and power consumption are critical requirements. The LM4950TS is an audio amplifier from Texas Instruments that can drive a 4Ω speaker while consuming as little as 4mW of power. In this article, we will discuss the LM4950TS’s main functioning principles and explain its application field.

Function Principles of the LM4950TS

The LM4950TS is a monaural, low-power audio amplifier designed primarily as a speaker driver in cellular phones and other portable applications. Its signal transfer capabilities and power efficiency make it well suited for a variety of audio systems. The LM4950TS is based on BTL (Bridge-Tied Load) architecture, which is a conventional single-ended output circuit for driving a 4Ω load. The BTL output circuit takes advantage of the load’s internal bridging network to provide increased drive capability.The LM4950TS\'s voltage amplifier section consists of a two-stage, internally compensated amplifier with direct-coupled outputs. This amplifier utilizes a NMOS cascode input stage and a PMOS cascode second stage as the output driver. A low-noise voltage follower is used for the input stage. The input voltage noise at the amplifier power supply voltage is typically 10nV/√Hz. The amplifier has an input impedance of 10kΩ and output impedance of 250Ω–600Ω, allowing it to drive low-impedance loads.The LM4950TS also features a shutdown mode, which is used to reduce power consumption to less than 0.2µA in portable applications. To reduce the noise, the IC has a high-performance low-noise amplifier section, which reduces crosstalk between input and output by one-third compared to conventional dual amplifier ICs.

Application Field of the LM4950TS

The LM4950TS is well suited for driving low-cost 4Ω speakers in mobile and portable applications where size and power consumption are critical. It has a wide range of features and specifications, making it a good choice for many types of audio applications. For instance, its low-power consumption makes it a great option for low-voltage and battery-powered applications; its high-efficiency output stage increases the audio power level and operating frequency range; its low-noise amplifier section reduces crosstalk; and its direct-coupled output stages offer superior distortion-cancellation capabilities.The LM4950TS can also be used to drive audio lines, which improves the signal-to-noise ratio of an audio system. It is an ideal choice for portable applications such as CD players, personal digital assistants, portable feature phones, and other mobile devices. It is also used in automotive audio systems and home audio systems, as well as for public address systems.In summary, the LM4950TS is a low-power audio amplifier IC that is capable of driving low-tolerance 4Ω speakers with high efficiency. Its features and specifications make it ideal for use in a variety of audio systems and applications.

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