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L79M05TL-E Application Field and Working Principle

Linear voltage regulator, such as L79M05TL-E, are commonly used in a variety of electronic equipment including toys, appliances, PCs, TVs etc. They provide a regulated output voltage from an unregulated input by using negative feedback loop circuit. L79M05TL-E is a negative linear regulator with a wide output voltage range and it is mainly used for voltage conversion and voltage stabilization. Especially, it is suitable for applications which require low quiescent current, low dropout voltage and low noise.

Working Principle of L79M05TL-E

The basic structure of a linear voltage regulator consists of three parts: an error amplifier, a control element and a reference element. The L79M05TL-E is a negative linear regulator and it works by comparing the input voltage (Vin) with a reference voltage (Vref) of 5V. The error amplifier amplifies the difference between the two and sends a signal to the control element. The control element is responsible for controlling the output voltage. It will adjust the output voltage so that it is equal to the reference voltage, thus the output voltage remains constant.

The control element of the L79M05TL-E is a transistor S or P channel. When the input voltage is higher than the reference voltage, the error amplifier sends a signal to the control element that causes it to conduct less, thus reduce the output voltage. On the other hand, when the input voltage is lower than the reference voltage, the error amplifier sends a signal to the control element that causes it to conduct more, thus increase the output voltage.

What are the Advantages of L79M05TL-E?

The L79M05TL-E has several advantages compared to other linear voltage regulators. It operates over a wide input voltage range, from 2.2V to 11V, and its output voltage can be adjusted within a range of 1.5V~5.5V. It has a low quiescent current of 15μA and a low dropout voltage of 0.3V at 1.5A load current. In addition, the L79M05TL-E has a fast transient response time (150μs) and the output voltage is protected from load dump pulses with a minimum reset voltage of 6V.

The L79M05TL-E also has a low noice feature which helps to reduce the effect of noise and transients in the power supply. This is important in applications such as mobile phones, medical instruments and audio equipment. Finally, the board layout of L79M05TL-E is optimized for easy hand soldering and automated assembly.

Conclusion

The L79M05TL-E is a negative linear regulator which has wide output voltage range and low quiescent current and dropout voltage. It has a fast transient response time and low noise feature. The optimized design of L79M05TL-E makes it suitable for a wide range of applications, especially those which require a low noise environment and stable output voltage.

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