L7905ACV

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L7905ACV is a three-terminal low cost negative voltage regulator of STMicroelectronics. It provides a fixed negative output voltage of -5V at up to 1A output current (with heat sink) over a wide input voltage range of up to 25V. The design of L7905ACV voltage regulator includes a wide range of features such as over-temperature, overload and short circuit protections. It also features thermal shutdown, current limiting and excellent line and load regulation.

Application Field of L7905ACV

L7905ACV can be used in different electrical engineering fields such as mobile phones and many audio and video applications. The chip is designed to provide a stable output voltage and current to drive negative side of systems. It is also used to stabilize voltage within a certain range in automotive, industrial and consumer electronics.

In computers or laptops, L7905ACV is used as a power supply for microprocessor, microcontroller and dynamic RAMs where -5V is needed to run them. It is also used to provide a negative bias voltage for various integrated circuits and transistors. In portable battery powered apps like toys, radios and hard disc drives, the L7905ACV provides -5V supply.

In audio and video applications, the negative voltage regulator L7905ACV is used to stabilize the voltage in amplifiers, sound systems, home theatres and sound recording systems. In communication systems such as land based and mobile communication networks, the L7905ACV is used to maintain the power supply at a constant voltage.

Working Principle of L7905ACV

L7905ACV IC is an array of voltage regulator circuitry which acts upon a linear regulation of the input voltage. The IC contains a series of reference voltage which is supplied to a differential problem output comparator which controls the output voltage in order to respect the required regulation. The output of the regulator is given by the chip\'s error amplifiers, voltage advisors and pulse width amplifiers.

The L7905ACV voltage regulator, like many of its kind, works through the controlling of an internal series of diodes to detect and control the voltage in its output. By monitoring the voltage level at the output, it then adjusts its reference voltage level of its series of diodes accordingly. This produces a negative output voltage which is always maintained in the range specified.The chip is also capable of providing a wide range of adjusting the output voltage level.

The internal components of the L7905ACV are divided into two major sections, power MOSFETs and driver circuits. The power MOSFETs are designed to act as switches to control the output voltage, while the driver circuits include the overall regulatory components, along with the comparators, error amplifiers and voltage monitors.

In case of overload or short circuit of the output, the voltage regulator is protected by a built-in thermal shutdown with automatic reset and a current limiting circuit. The current limiting circuit limits the output current and prevents it from getting out of hand. The L7905ACV also features a thermal noise reduction technology which reduces the noise generated by the power MOSFETs.

Conclusion

The L7905ACV voltage regulator is an essential component for providing a stable output voltage in many different electrical and communication systems. It provides a negative output voltage of -5V up to 1A output current. This device is equipped with many features such as over-temperature, overload and short circuit protections as well as much lower thermal noise due to its design. This linear regulator works through controlling the series of diodes within the chip, in order to maintain the output voltage level.

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