PT78NR105V

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DC-DC converters are an integral part of our everyday lives, as they are used in a variety of practical applications. One example of a DC-DC converter is the PT78NR105V, which is a DC-DC voltage regulator with constant voltage and current limiting functions. In this article, we will discuss the application field and working principle of the PT78NR105V.

The PT78NR105V is specifically designed to be used as a DC-DC voltage regulator or power supply. It is designed to provide a regulated output voltage with precise output current limiting. This makes it suitable for use in battery-powered, mobile, industrial, 8-bit microcontroller and ITE applications. It also offers a wide-ranging adjustable output voltage, from 0.5V to 5.5V, and can be programmed with an external resistor.

In addition, the PT78NR105V has a good EMC performance and is compliant with the RoHS environmental protection directive. It is also equipped with an undervoltage lockout (UVLO) and overcurrent protection (OCP) function, which can effectively protect the circuits from overcurrent and undervoltage events. Furthermore, its low quiescent current and low noise design make it a great choice for low power applications.

The PT78NR105V works by converting a DC input voltage to an output voltage of a fixed value. It uses a linear regulator circuit to achieve this. The voltage is generated by an error amplifier which compares the voltage applied to its inverting (-) input terminal with a reference voltage and produces a voltage signal proportionally. This voltage signal is then fed to the pass transistor, which determines the output voltage. The output voltage is adjusted by controlling the error amplifier reference voltage.

The PT78NR105V also has a current limiting feature. This feature sets an upper limit on the current that can flow through the device. The current limiting threshold can be adjusted by changing the external resistor connected to the current limit sense pin. When the current going through the device exceeds its set limit, the device will shut itself off and protect the circuit from damage due to excessive current.

In conclusion, the PT78NR105V is an excellent choice for DC-DC voltage regulators or power supplies and offers an adjustable output voltage with precise output current limiting capability. This makes it suitable for a variety of applications, such as battery-powered, mobile, industrial, 8-bit microcontroller and ITE applications. Furthermore, the device is equipped with an efficient EMC performance, RoHS compliance and other protective features. This ensures that the device works safely and reliably in any application.

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