FAN2513S27X

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FAN2513S27X Application Field and Working Principle

The FAN2513S27X voltage regulator series from Fairchild Semiconductor is a 3-terminal, fixed output linear voltage regulator with a low quiescent current and excellent line and load regulation. It\'s capable of delivering up to 300mA of output current and can accept input voltages up to 36V. With these features and its small size, the FAN2513S27X is an ideal choice for a wide range of circuit designs.

FAN2513S27X voltage regulators are designed primarily for use with portable electronic devices such as portable radios, digital cameras, and laptop computers. They are also used in applications such as automotive sensors, computer memory modules, and security systems. The FAN2513S27X regulator is also suitable for power supplies and battery-powered applications.

The FAN2513S27X voltage regulators are based on a linear regulator design. This fundamental design relies upon a voltage reference, an error amplifier, a pass transistor, and a current-limiting circuit to keep the output voltage stable over varying line, load, and temperature conditions. The voltage reference is a precision diode whose output voltage is determined by a resistor in series with the diode.

The error amplifier is used to compare the regulated output voltage to the setpoint voltage (VREF). If the output voltage is different from the setpoint, the error amplifier will adjust the current through the pass transistor to bring the output voltage back to the setpoint. This process of adjusting the current so that the output voltage maintains its setpoint level is referred to as feedback regulation.

The pass transistor is a P-channel DMOSFET connected to the output of the error amplifier. As the error amplifier adjusts the current through the pass transistor, the voltage at the source of the FET will change, causing the voltage at the output of the FAN2513S27X regulator to change. When the error amplifier determines that the output voltage is equal to the setpoint voltage, the current through the pass transistor will remain constant.

In order to prevent excessive current from flowing through the FET, the FAN2513S27X includes an on-chip current-limiting circuit. This circuit also includes a thermal shut-down feature, which can be used to protect the regulator and the powered device from over-current conditions.

The FAN2513S27X linear voltage regulator is easy to use and offers a high level of flexibility. With its low quiescent current, excellent line and load regulation, and wide input voltage range, the FAN2513S27X is an ideal choice for applications requiring a high level of performance and reliability.

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