TPA721D

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Class AB
Output Type:	1-Channel (Mono)
Max Output Power x Channels @ Load:	700mW x 1 @ 8 Ohm
Voltage - Supply:	2.5 V ~ 5.5 V
Features:	Depop, Short-Circuit and Thermal Protection, Shutdown
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Base Part Number:	TPA721

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TPA721D is a power digital amplifier integrated circuit, which applies to the audio with 8W stereo output. It is featured by low noise, few external devices and low cost. It is commonly categorized into the linear, amplifiers and audio device categories, the latter one being more specific to the area of application.The TPA721D is a very popular power amplifier for a variety of applications in many areas, such as speakers, audio output and automotive systems. Its application field is quite wide, ranging from home theater and stereo amplifiers, to portable audio players and automotive infotainment systems.The TPA721D is based on DirectFET Technology which offers an accurate current limiter and improved output power for better fidelity. DirectFET Technology offers tighter wideband performance and wide bandwidth resulting in improved power efficiency. This power efficiency in turn leads to improved battery life when used in portable audio players and automotive audio systems.Regarding the working principle of TPA721D, several devices are involved, such as high voltage power MOSFET devices, “SmartFETs”, which are digital switches that can be used in the switching process, an integrated current-sense module, among many others.The TPA721D integrates a DirectPath analog PGA that allows the user to adjust the output power by using I2C digital commands. It also allows the user to set the current limit by jacking the gain, or set the gain directly from I2C, allowing the user to fine tune their system. The integrated power supply allows the user to adjust the power rail voltage to get the desired power for audio output.The TPA721D also integrates both a bridge driver and h-bridges necessary for implementing a bridge mode amplifier. This allows for more efficient power output and higher levels of output power than traditional linear amplifiers.In addition, the TPA721D includes an integrated fault protection module, which helps to prevent catastrophic failure. This protects both the speaker and the amplifier from damage due to excessive levels of current or voltage.Overall, the TPA721D is a powerful and highly versatile amplifier device. Its wide application field and innovative working principle make it an excellent choice for audio application designers. Its DirectFET Technology allows for improved power efficiency and longer battery life, while its integrated Fault Protection Module helps to prevent damage due to improper operation.

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