FAN2505S26X

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The FAN2505S26X is a linear voltage regulator, which is part of a broader family of devices known as power management integrated circuits (PMICs). It is designed for applications ranging from consumer and automotive to industrial, medical, and even space-based systems. It is typically used in voltage regulation for high efficiency power supply and control circuits. In this article, we’ll take a closer look at the FAN2505S26X application field and working principle.

Applications

The FAN2505S26X offers adjustable output voltage from 0.8 V to 26 V and output current up to 1A in a five-pin SOT-23 package, making it ideal for use in consumer switches, automotive systems, portable devices, and other embedded systems needing regulated low-voltage power supply. Since its operating temperature range spans from -40°C to +125°C, it is also suitable for extreme environment applications such as medical equipments, industrial controls, space and aerospace systems. Furthermore, its low 6uA quiescent current and a fast transient response of 1µs guarantee stability and reliable performance during sudden overloads and wide temperature swings.

Working Principle

The FAN2505S26X is a linear voltage regulator, which means it works by transferring electric energy from its input voltage source, known as the input voltage, to its output voltage source, known as the output voltage. An internal amplifier and low-pass filter connected to the input side of the regulator converts the input voltage into the essential form for the voltage regulator. This form is then fed to the regulator, which takes the input voltage and modifies it as necessary in order to generate the desired output voltage.

The FAN2505S26X uses a proprietary Zener and Bipolar junction transistor (BJT) circuit architecture, which enables it to produce an output voltage that is accurately regulated over the entire operating temperature range. The regulation is achieved by employing an Error amplifier, PNP circuit, Zener diode, and sense resistor to monitor and control the voltage. The Error amplifier continuously compares the output voltage to a reference voltage and determines the appropriate BJT base current to regulate the output to the desired level. In addition, the use of the sense resistor and Zener diode allows for current stability and current overload protection.

The FAN2505S26X is also equipped with thermal shutdown, reverse power protection, and short-circuit protection features. The thermal shutdown feature will turn off the regulator if the junction temperature of the chip approaches 150°C and will not turn back on until the chip has cooled to a safe temperature. The reverse power protection will prevent the device from being damaged during accidental reversal of power between the input and output. Finally, the short-circuit protection prevents the output voltage from being excessive when the output is short-circuited to ground.

In summary, the FAN2505S26X is a linear voltage regulator designed for applications ranging from consumer and automotive to industrial, medical, and even space-based systems. Its adjustable output voltage from 0.8 V to 26 V, fast transient response of 1µs, low quiescent current, and built-in protection features make it an ideal solution for low-voltage power supply and control circuits in a variety of industries.

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