NCP1117DT15G

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NCP1117DT15G Application Field and Working Principle

NCP1117DT15G is a low power linear voltage regulator, developed by ON Semiconductor Corporation. It is classified as part of their PMIC (Power Management IC) - Voltage Regulators - Linear product line. NCP1117DT15G is a 3 pin, high efficiency fixed output voltage regulator with an output voltage range of 5.0V, delivering up to 500mA at temperatures ranging between -40°C and +125°C. It is a three-terminal voltage regulator, operating from a 5V up to a 20V input voltage range, and featuring internal current limiting, thermal shutdown and an easy-to-use Power Good pin.

Applications:

NCP1117DT15G is typically used in a wide range of applications, which include computer tasks, net communication, TV and multimedia, data storage, and battery-powered systems. Specifically, it can be used as a general purpose regulating power supply, providing a stable 5.0V output voltage over a wide temperature range. It can be used as a battery charging regulator, a switch mode power supply (SMPS) controller, as well as in battery-backed DC/DC converter applications and in a variety of automotive and industrial applications.

Working Principle

The NCP1117DT15G is a three-terminal low-dropout voltage regulator with an output voltage of 5.0V. It is a simple voltage regulator, made up of a few simple components. The main parts include an error amplifier, a comparator, a voltage reference, a bias resistor network and a pass element (usually a P-channel MOSFET).

The error amplifier compares the output voltage of the regulator with the voltage reference. When the regulator output is lower than the reference, the error amplifier outputs an increased voltage, which triggers a P-channel MOSFET and therefore increases the current flow towards the output. Conversely, when the regulator output is higher than the reference, the error amplifier decreases the voltage, thus decreasing the current flow towards the output. The combination of an error amplifier and a P-channel MOSFET is what allows the NCP1117DT15G to maintain a constant 5.0V output voltage over a wide input voltage range.

In addition, the NCP1117DT15G is equipped with a number of protection features. Internal current-limiting and thermal shutdown protect it from internal overload. An external resistor can be used to set the current limit and a Power Good pin allows for monitoring the regulator\'s output status. All of this makes the NCP1117DT15G an extremely reliable and efficient voltage regulator.

Conclusion

NCP1117DT15G is a low-power linear voltage regulator from ON Semiconductor Corporation, part of their PMIC (Power Management IC) product line. It is a three-terminal voltage regulator, offering a wide input voltage range, an easy-to-use Power Good pin and a few protection features. It’s suitable for a variety of applications, including computer tasks, net communication, TV and multimedia, data storage, and battery-powered systems. Its simplicity and efficiency make it an ideal choice for many applications.

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