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Voltage regulator IC-converts unstable DC voltage to stable one


Voltage regulator IC, also known as IC regulators, work on the same principle as transistor voltage regulators. The integrated circuit voltage regulator is installed on the generator. According to the different voltage detection points, it can be divided into two types: generator voltage detection method and battery voltage detection method.

What is a voltage regulator IC?

Voltage regulator IC is a device which is used to maintain constant voltage automatically. It is used to provide fixed constant output voltage. A change in the load or input voltage won’t cause any effect. A feedback loop can automatically adjust the resistance in a linear voltage regulator.

What is the function of the voltage regulator IC?

The function of voltage regulator is to ensure constant voltage supply by using all operational conditions. The voltage regulator also regulates power fluctuations and also AC and DC voltages.

Which is the 3-terminal voltage regulator IC?

A 3-terminal voltage regulator has the ability to supply an abundance of 1.5 A current between the voltage range of 1.25 V to 37 V. It has 3 pins. The output voltage is adjusted by using the first pin. Output is collected by the second pin and the third pin connects the input. Only two resistors are required for the setting of input voltage

What are the advantages of an IC voltage regulator?

An IC voltage regulator has the following advantages.
● It is very convenient and easy to use.
● It can be used for local regulation.
● It is very lightweight and comes in a compact size.
● The power supply design is quick and easy.
● It has built-in protection, internal protection, current and voltage boosting, etc.
● It is manufactured easily on large scales.
● One big advantage is that it is very cheap due to mass production.What-are-the-advantages-of-an-IC-voltage-regulator

Which IC is used in the voltage regulator circuit?

7805 IC is used in the voltage regulator circuit. This is also used in phone chargers, UPS power supply circuits, portable CD players, etc. This IC can provide a fixed output voltage of 5 V. The last 2 figures in the number 7805 give us the output voltage of the IC voltage regulator.

How do IC voltage regulators work?

A fixed output voltage is created and is maintained by using an IC voltage regulator. The load conditions and input voltage doesn’t affect the output voltage. In simple terms, a voltage regulator is an emitter follower in which a stable reference is connected to a transistor which gives a constant voltage. A built-in error amplifier is also installed in it which checks the output voltage.

How do you test an IC voltage regulator?

How-do-you-test-an-IC-voltage-regulatorA multimeter is used to test the IC voltage regulator. The probes are taken and then the positive probe, the red one is placed on the input pin, and the negative probe, the black one is placed on the ground pin. The voltage reading should be greater than the rated voltage of the regulator.

How do I choose a voltage regulator IC?

On the basis of the following factors, IC voltage regulators are chosen.
● Input voltage and output voltage
The input voltage must be higher and not less. Which will result in insufficient voltage and cause the regulator to be dropped out.

● Dropout voltage
It is the difference between input and output voltage. If the minimum input voltage is 7 V and the output is 5 V then their difference will be the dropout voltage i.e., 2 V. It is different for different regulators.

● Power dissipation
The major drawback of a linear drawback is the wastage of lots of power which results in excessive battery drainage. Linear regulators are also cheap. The power dissipation of a regulator is calculated by

➱Power = (input voltages – output voltages) * current

If the amount of the current and the difference of the voltages are greater, then a large amount of power will be dissipated.

● Voltage accuracy
The accuracy depends on the following factors.
1)Error Amplifier
2) Temperature Coefficient
3) Load Regulation
2)Line Regulation
4) Error Amplifier Voltage Drift
5) Reference Voltage Drift

● Line regulation
Line regulation is the ability of the circuit to maintain a specific output voltage. It is done by varying the input voltage. The formula is given byLine-regulation

● Load regulation
The ability of a power supply to maintain a constant voltage. It is the ability to maintain a constant voltage output from a power source or supply. Its formula isLoad-regulation

● Efficiency
It is directly proportional to the ratio of output voltage to input voltage. The regulator’s dropout voltage and passive current both have an impact on the regulator’s efficiency.

What is the voltage regulator used for?

A constant steady voltage is obtained by using a voltage regulator. Voltage is regulated during fluctuations in power and in load variations. AC and DC voltages are also regulated by a voltage regulator. The lower stable output voltage is emitted by a voltage regulator.

What are the types of voltage regulators?

The voltage regulator has the following types.
● Linear Voltage Regulator
● Switching Voltage Regulator

Linear Voltage Regulator

The variable conductivity of the active pass element such as a BJT or a MOSFET is responsible for the regulation of the output voltage. When the load has been applied the regulations due to input or load will cause the variations in current.

Further types of Linear Voltage regulators.

● Series Voltage Regulator
● Shunt Voltage Regulator

Switching Voltage Regulator

It converts the input direct current DC voltage to the preferred direct current voltage. The role of converting the voltage from the battery or any other source to the required voltage is played by switching the voltage regulator in an electronic device.

Other switching voltage regulators

● Step Down Voltage Regulator
● Transistor Voltage Regulator
● Step Up/Step Down (Boost/Buck)
● Alternator Voltage Regulators
● Electronic Voltage Regulator

What is the function of IC 7805?

The main function of an IC 7805 is to restrict the output voltage to 5 V for a wide range of input voltage. It serves as a great buffer against changes in input voltage. It also provides additional safety for the circuit. The IC 7805 is easily available and is inexpensive and easy to use.

FAQ about voltage regulator IC


Is a voltage regulator a transistor?

The answer is no. A voltage regulator is not a transistor. But a transistor can act as a voltage regulator circuit.

Which IC is used for voltage regulation?

LM317 as well as IC 7805 voltage regulator are used for voltage regulation because we get a desired positive fixed DC voltage value.

How does a voltage regulator work IC?

It works by comparing the output voltage with a reference voltage and adjusting the pass device which maintains a constant output voltage.

What is the range of output voltage of the regulator IC?

The range of the LM317 voltage regulator for output voltage is between 1.25 V to 37 V at an excess of 1.5 A current.


In addition to the advantages of transistor regulators, voltage regulator IC also have ultra-small size and are installed inside the generator (also known as built-in regulators), reducing external wiring and improving cooling effects, and are now widely used in Santana, Audi and other car models. But for the voltage regulator IC, it must be dedicated and cannot be replaced.



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