AN17821A

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	Class AB
Output Type:	2-Channel (Stereo)
Max Output Power x Channels @ Load:	5W x 2 @ 8 Ohm
Voltage - Supply:	3.5 V ~ 13.5 V
Features:	Standby, Volume Control
Mounting Type:	Through Hole
Operating Temperature:	-25°C ~ 70°C (TA)
Supplier Device Package:	12-SIL
Package / Case:	12-SIP + Tab
Base Part Number:	AN17821A

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AN17821A Application Field and Working PrincipleThe AN17821A is a type of audio amplifier designed primarily for the audio-visual industry. It has become the standard choice of audio amplifier for many devices including music players, portable DVD players, televisions and communications equipment. This article will discuss the type of applications for which the AN17821A can be used and the basic working principle behind its operation.ApplicationsThe primary application field of the AN17821A is as a stereo amplifier in audio-visual equipment. It has been widely adopted as the standard audio amplifier in devices such as MP3 players, laptop computers, PDA’s, portable DVD players and other portable audio-visual products. It has also been used in a variety of communication devices such as cordless telephones and cellular phones. Additionally, the AN17821A has been used in a variety of domestic products such as television sets, stereo receivers, cable boxes and satellite receivers. The versatility of the AN17821A is further enhanced by its ability to operate from a single supply voltage ranging from 3V to 15V. This makes it ideal for many applications where a bipolar supply voltage is not available. It also has a wide power output range which can be scaled from 0.6W to 40W. This makes it suitable for both low-power and high-power audio applications. Working PrincipleThe AN17821A is an integrated circuit comprising of thirty-five transistors and accompanying components. The primary function of the device is to amplify the input signal (from a music or other media source) and convert it into an output signal suitable for driving a speaker or headphones. The circuit consists of two stages. The first stage is the input stage which comprises of three transistors configured as an input differential amplifier. This amplifier amplifies the small input signal and is designed to reject any noise or other unwanted signals that may have been picked up along the way. Following this, the signal is then buffered through an output driver stage. This stage is composed of two transistors connected in parallel to form a push-pull style of output driver. The output of the driver is then fed out of the device via an output transformer which is used to match the output impedance of the device to that of the speaker connected to it.The AN17821A also contains a number of protection features designed to prevent damage to the device and to the connected speakers or headphones. It features short-circuit protection, thermal protection and overload protection. These features are designed to prevent excessive currents, voltages or power dissipations from damaging the device or the connected equipment. ConclusionThe AN17821A is an audio amplifier suitable for a variety of audio-visual equipment. It is robust and versatile, with the ability to operate from a single supply voltage and with a wide power output range. The device is composed of two stages, an input stage and an output driver stage, and contains protection features to ensure the safety of the device and any inconsequential equipment.

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