LM137K

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LM137K Application Field and Working Principle

The LM137K is a monolithic adjustable three-terminal positive voltage regulator developed by the semiconductor powerhouse Texas Instruments. It is an integrated device that combines the features of an easy-to-use voltage regulator and a temperature compensated high accuracy current regulator. The LM137K is part of the family of linear voltage regulators that Texas Instruments has developed. It features a dynamic range of 2.85V to 10V adjustable output voltage and current rating of 400mA.

The LM137K is well suited for a variety of applications such as TTL and CMOS logic, power supplies, motor control circuits, microprocessor circuits, portable electronics, and instrumentation. It is designed to provide a smooth output voltage range of 2.85V to 10V within ±0.1% accuracy. The LM137K also has excellent temperature performance and can operate in temperatures between –40°C and 70°C. The maximum power dissipation it can handle is up to 70 Watts when used in a typical circuit configuration.

The LM137K operates on a wide range of input voltages of 9V to 40V, making it highly flexible for a wide range of applications. It can also provide tight line and load regulation of typically 0.03%, ensuring that the output voltage is maintained within a very tight tolerance. The LM137K features temperature compensation, which helps to ensure a stable output voltage over temperature changes.

LM137K Working Principle

The working principle of the LM137K is based on a 3-terminal voltage regulator architecture. The LM137K is powered by a DC input voltage and regulates this voltage to a preset voltage output. An external resistor-divider network is connected between the output and the adjust pin to set the desired output voltage level. The output voltage is fed back to the adjust pin to maintain a precise output voltage level. The LM137K employs internal current limiting and thermal shutdown protection, which make it self-protecting and easy to use.

The LM137K also provides a wide range of output current capability. It uses an internal power MOSFET, which has a low on-resistance thereby allowing a high output current capability up to 400mA. The internal MOSFET and output voltage sensing enable the LM137K to compensate for the effects of line input fluctuations, output load fluctuations and temperature changes.

Conclusion

The LM137K is a versatile, high-accuracy and adjustable 3-terminal positive voltage regulator with a wide application field. It features excellent temperature performance, good line and load regulation, and can operate at a very wide input voltage range of 9V to 40V. It also provides a high output current capability, with thermal protection and current limiting, making it self-protecting and easy to use. With so many features packed into a simple 3-terminal format, the LM137K is an ideal solution for a wide variety of power management applications.

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