TPA731DGNR Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
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:	Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	8-MSOP-PowerPad
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Base Part Number:	TPA731

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TPA731DGNR Application Field and Working Principle

The TPA731DGNR is a type of linear audio amplifier whose features and performance make it suitable for several application fields. It is a single package solution designed to enhance music listening experiences with significantly improved playback. Moreover, the TPA731DGNR is an efficient solution to the current power management requirements, offering the ideal level of performance for general audio tasks. The TPA731DGNR is used in a variety of audio applications such as car entertainment systems, mobile phones, and home theatres.The TPA731DGNR is a dual power operational amplifier with a wide operating temperature range of -40 to +125 °C. It uses a bipolar-junction transistor (BJT) as the main active device and a complementary low-noise input stage for low-level audio signals. The TPA731DGNR also includes an integrated output-short circuit protection, a signal-band gap control and a power-on reset circuitry, among other features.The amplifier is able to offer a power-on reset input, which is under the voltage-controlled SourceFET (VCSFET) architecture, which provides an improved integration level as well as an improved power efficiency. Furthermore, the amplifier can supply a low power-on reset current (1µA) while keeping the reset voltage at around - 2V. This feature makes the TPA731DGNR suitable for a wide range of audio applications where it offers a reliable reset function. The TPA731DGNR is composed of three key components that provide its operation. Firstly, the input stage is composed of a complementary differential pair, consisting of transistors T1 and T2. These transistors are the main working components and provide an input signal by the input bias of the base emitter junction. This input signal is further processed in the amplifier which uses the bipolar junction transistors (BJTs) to provide an amplified output signal. The second component is the active-shunt biasing circuit. This circuit provides a stable biased output voltage, halting emitted noise and improving linearity and power efficiency without undue power drain. The active-shunt biasing circuit utilises the working of transistors T3, T4 and T5 to provide constant current flow across the emitter-collector junction via integrated resistors and capacitors.The final aspect of TPA731DGNR is the power Supply Rejection Ratio (PSRR). This is used to provide a consistent level of voltage regulation, which prevents the current from exceeding the maximum level, even in the presence of large changes in power supply voltage. The PSRR of the TPA731DGNR is high, and it ensures that the output remains stable, even when the power supply voltage drops.In conclusion, the TPA731DGNR is a single package solution to the current noise, power efficiency, and linearity needs in audio applications. It takes advantage of its complementary differential pair and active-shunt biasing circuit to provide low-level input signals and high-performance linearity and power efficiency. Moreover, its high PSRR ensures that the output remains stable even during large changes in power supply voltage.

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