LM117K Integrated Circuits (ICs)

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LM117K is a three-terminal adjustable regulator of the subminiature TO-92 (SOT-23) package series that features an adjustable output voltage of 1.2 volts to 37 volts and programmable current limiting. It is the best choice for linear voltage regulation for applications requiring 3 V or less. LM117K is suitable for a wide range of applications, where precise and stable voltage regulation with adequate thermal stability is required. To ensure optimal performance, the device should be employed with other components such as precision voltage reference, current sense amplifiers, and output transistors.

Features

The LM117K features adjustable voltage of 1.2V to 37V and programmable current limiting, making it an ideal choice for a variety of applications. It’s maximum output current of 1.5A ensures an adequate heat dissipation, making the device highly reliable. In addition, its low quiescent current of 17mA and thermal shutdown boost its efficiency. Furthermore, the device has no latch-up and is easy to use.

Applications

The LM117K is suitable for a wide range of applications, including industrial, automotive, and consumer electronics. In industrial applications, the device can be used for audio amplifiers, servo-motor control, and automatic control systems, among other implementations. It is also suitable for air conditioners, refrigerators, automatic lighting systems and other systems requiring precise and stable voltage regulation. In automotive applications, the device can be used for voltage regulator, battery charger, solenoid drivers, and electronic power steering, among other purposes. In consumer electronics applications, it is an ideal choice for portable electronic devices such as cell phones, laptops and digital cameras.

Working Principle

The LM117K works by comparing the reference voltage to the secondary pair of resistors as its output. This is accomplished by sensing the voltage across the resistors and sending a signal to the regulator to increase or decrease the output voltage. If the output voltage is higher than the reference voltage, the LM117K will reduce the output to bring the output voltage back to the reference level. Similarly, if the output voltage is lower than the reference voltage, the LM117K will increase the output voltage to equal the reference voltage. The LM117K thus maintains a constant output potential at all times.

The LM117K utilizes a band gap reference, which is essentially a voltage source that is connected to an amplifier. This amplifier is designed to compare the reference voltage with the secondary pair of resistor values and send a signal to the regulator according to the comparison. By using the reference voltage, the regulator can maintain a constant output even when the input voltage or load currents change.

Conclusion

The LM117K is a three terminal adjustable regulator ideal for a wide range of applications requiring precise and stable voltage regulation. It features adjustable output voltage of 1.2V to 37V, programmable current limiting and a maximum output current of 1.5A. Additionally, its low quiescent current of 17mA and thermal shutdown make it an efficient component. Furthermore, it has no latch-up and is easy to use. Its uses include audio amplifiers, industrial systems, automotive systems and consumer electronics. The LM117K works by comparing the reference voltage to the secondary pair of resistors and sending a signal to the regulator to increase or decrease the output voltage, thus maintaining a constant output potential at all times.

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