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Voltage Regulator IC

A transformer could use an easy feed-forward style or could embrace feedback. it’s going to use AN mechanical device mechanism or electronic parts. reckoning on the look, it’s going to be wont to regulate one or additional AC or DC voltages. Electronic voltage regulators are found in devices like laptop power provides wherever they stabilize the DC voltages employed by the processor and alternative components. In automobile alternators and central powerhouse generator plants, voltage regulators management the output of the plant.

Automatic voltage regulator :

The first automatic voltage regulators for generators were mechanical device systems, however, a contemporary AVR uses solid-state devices. associate degree AVR could be a feedback system that measures the output voltage of the generator compares that output to a collection purpose and generates a slip signal that’s accustomed alter the excitation of the generator. because the excitation current within the field coil of the generator will increase, its terminal voltage can increase.

The AVR can management current by victimization power electronic devices; usually, any low a part of the generator’s output is employed to supply current for the sector winding.

wherever a generator is connected in parallel with different sources like associate degree electrical transmission grid, dynamic the excitation has a lot off of control on the reactive power made by the generator than on its terminal voltage, that is usually set by the connected facility.

Solid State Voltage Regulator :

Voltage regulator, any electrical or device that maintains the voltage of an influence supply inside acceptable limits. … Electronic voltage regulators utilize solid-state semiconductor devices to rid variations within the flow of current.

A transformer is employed to manage voltage level. once a gradual, reliable voltage is required, then the transformer is that the most popular device. It generates associated fast|a set} output voltage that is still constant for any changes in an input voltage or load conditions. It acts as a buffer for safeguarding parts from damages.

Electronic voltage regulators :

A simple voltage/current regulator may be made of an electrical device serial with a diode. thanks to the power form of diode V-I curves, the voltage across the diode changes solely slightly thanks to changes in current drawn or changes within the input. once precise voltage management and potency aren’t vital, this style could also be fine.

Since the forward voltage of a diode is tiny, this type of transformer is merely appropriate for low voltage regulated output. once higher voltage output is required, a Zener diode or series of a lot of zen diodes could also be used. Zener diode regulators build use of a lot of zen diodes fastened reverse voltage, which might be quite massive.

Voltage Regulator IC 7805 :


Voltage sources in a very circuit might have fluctuations leading to not providing fastened voltage outputs. A transformer IC maintains the output voltage at a continuing price. 7805 IC, a member of 78xx series of fastened linear voltage regulators accustomed maintain such fluctuations, could be a standard transformer computer circuit (IC). The xx in 78xx indicates the output voltage it provides. 7805 IC provides +5 volts regulated power provided with provisions to feature a conductor.

Pin Diagram of 7805 :


As mentioned earlier, 7805 is a three terminal device with the three pins being 1. INPUT, 2. GROUND and 3. OUTPUT. The following image shows the pins on a typical 7805 IC in To-220 Package.

Pin 1 is the INPUT Pin. A positive unregulated voltage is given as input to this pin.
Pin 2 is the GROUND Pin. It is common to both Input and Output.
Pin 3 is the OUTPUT Pin. The output regulated 5V is taken at this pin of the IC.

Pin Details of 7805 IC :

  • Input voltage range 7V- 35V
  • Current rating Ic = 1A
  • Output voltage range VMax=5.2V ,VMin=4.8V

7805 Regulator Features 

  • 5V Positive Voltage Regulator
  • Minimum Input Voltage is 7V
  • Maximum Input Voltage is 25V
  • Operating current(IQ) is 5mA
  • Internal Thermal Overload and Short circuit current limiting protection is available.
  • Junction Temperature maximum 125 degree Celsius
  • Available in TO-220 and KTE package

7805 Applications :

  • Constant +5V output regulator to power microcontrollers and sensors in most of the projects
  • Adjustable Output Regulator
  • Current Limiter for certain applications
  • Regulated Dual-Supply
  • Output Polarity-Reversal-Protection Circuit