IC 7805 Voltage Regulator
IC 7805 is one of the popular Integrated circuit that can be found in almost all electronic circuits. IC 7805 is used for voltage regulation. It is gives a constant voltage output for a wide range of varying input voltages.
Why IC 7805 is called so?
IC 7805 belongs the family of 78xx. It is also called as LM 7805, L 7805, MC 7805 etc. the last two digits (05) denotes the output voltage of the IC.
Other ICs of 78xx series
Output Voltage (V)
About IC 7805
As mentioned earlier IC 7805 IC is used for voltage regulation in an electronic circuit. It is a three pin IC that gives a constant output voltage of 5V irrespective of the varying input voltages. The maximum value of input voltage that the IC can withstand is 24 volts. The output of the IC will be a constant 5V up to the input voltage of 24V (i.e.) any increase in the input voltage will not affect the output voltage of IC 7805. It will be always supplying a constant 5 volt even if the input voltage rises above 5 volts. IC 7805 comes with a provision to add heat sink. When IC 7805 is operated above 7 volts it requires heat sink. When it is operated above 7 volts, it produces more heat and strictly requires a heat sink for the proper dissipation of heat energy produced.
Why voltage regulation is required in an electronic circuit?
IC 7805 is used to maintain a steady state voltage level in an electronic circuit. Voltage fluctuations in a circuit may damage the circuit components and reduce the life of the equipment. Hence it is essential to supply a constant voltage to the circuit.
For example, consider that we need to provide Vcc (5V) to a microcontroller. If we are supplying the required voltage directly from a rectifier, any voltage variations will directly affect the micro controller thereby damaging it. In order to avoid this we can include IC 7805 to the circuit to provide a constant and steady voltage output.
Input voltage (5V-18V)
Regulated output; 5V (4.8V-5.2V)
Pin out Configuration of IC 7805.
The pin out configuration of IC 7805 is shown in the diagram.
IC 7805 Pin out configuration
IC 7805 must be used in the circuit as shown in the circuit. It consists of two capacitors C1 and C2 connected across the input and output terminals respectively.
Why capacitors are connected across the input and output terminals of 7805?
The capacitor C1 connected across the input terminal and the ground eliminates the inductive effects due to long distribution leads. The capacitor C2, connected across the output terminal and the ground improves the transient stability.
Download data sheet for LM7805
IC 79xx - Negative Voltage Regulator
- IC 79xx - Negative Voltage Regulator
IC 79xx is a three pin negative voltage controller IC. It is a small integrated circuit used in a circuit to supply a constant negative input voltage.