TL431AQPK Integrated Circuits (ICs)

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Power Management Integrated Circuits (PMIC) serves as an essential part of a power system. PMIC can optimize the system performance, improve the power supply reliability, and help reducing the power losses. The Voltage References subcategory of PMIC is an important category, and the TL431AQPK is playing an increasingly important role in this field.

The TL431AQPK is an adjustable precision reference released by Texas Instruments. The device is able to provide an output voltage of 2.5 V to 36 V. It offers low input bias current, low output noise and few temperature drifts. The device has a maximum power dissipation of 500 mW, with a voltage sensing accuracy of ±1%. On top of that, the TL431AQPK also got a low input offset voltage, which makes the device even more attractive.

With ultra low quiescent current and improved line regulation, adjustable high-precision references provided by TL431AQPK are able to ensure reliable, high-precision voltage references in switching designs. The wide operating temperature range of -55°C to 125°C makes TL431AQPK ideal for use in both commercial and industrial applications.

The working principle of TL431AQPK is as following. The device consists of an internal temperature compensated reference, an error amplifier, a voltage divider, and a current source, which are connected as shown in the figure. When the input voltage exceeds the reference voltage at the comparator, the error amplifier output goes to a high state. As the voltage divider resistance rises, the current source will be turned off at the same time, and it will be able to generate an overvoltage protection. When the input voltage is lower than the set voltage, the output of the error amplifier will be switched to the low-level state, and the current source begins to work. Eventually, a certain current will be created and remain in a stable state, and thus the output voltage will be determined.

As seen, the TL431AQPK can provide a high-precision output voltage and ensure superior performance in demanding applications, such as communications equipment and automotive dashboards. Moreover, the device become more popular with their extremely low power consumption, which can reduce the overall power consumption of the system and help with energy efficiency. With all these advantages, the TL431AQPK is an optimal choice of adjustable-precision reference for power management and voltage references.

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