NJM317F

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NJM317F Application Field and Working Principle

NJM317F, a type of voltage regulator integrated circuit, is classified into the broader category of PMIC (Power Management Integrated Circuit) voltage regulators, with a particular emphasis on linear regulation. It is a three-terminal SIP (Single In-line Package) regulator which boasts of both cost-saving features and quality performance. As far as its application field goes, NJM317F finds use in a variety of applications including audio equipment, microcontrollers and digital signal processors, and laptop power supply design.

NJM317F can offer output voltage ranging from 10V to 24V, outside of which a minimum dropout voltage of 1.25V is to be maintained. A variable output voltage can be achieved by changing the external resistor values. This makes NJM317F an ideal choice for a regulated power supply in portable applications. The specified output current can range from 500mA to 1A, and it can be used at temperatures ranging from -25C to 70C.

Working Principle

The NJM317F consists of an internal voltage reference, a high impedance NPN transistor, an error amplifier, and an output driver. It is somehow similar to the LM317 in that it offers a three-terminal adjustable regulator. The operations of NJM317F can be represented in the form of a feedback loop. This includes the “Error Amp” at the front which compares the voltage at the output and the voltage at the reference to form a virtual ground, and the “Driver Transistor” which controls the output voltage in accordance. When an output voltage is required, an external control voltage is set and the output is adjusted accordingly. If the output voltage is too low, then the transistor will begin to sink more current, thus increasing the output voltage. Similarly, if the output voltage is too high, then transistor will begin to source less current, thus reducing the output voltage.

The NJM317F also offers protection against variable input, reverse connection, current surge, and thermal limitation. It also offers protection against transient thermal overload when the power supply makes the transition from full load to no load. Additionally, there is some immunity to the load-dump phenomenon when the output voltage is suddenly dropped, as the current-limiting circuitry will prevent the IC from being damaged.

In conclusion, NJM317F is an effective three-terminal adjustable voltage regulator suitable for various power supply applications. Its adjustable output allows it to be used in a variety of portable devices, and its features like voltage, current and surge protection, makes it an ideal choice for these systems. Its cost-effective nature helps to save cost in the production process.

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