Table of Contents
What does a diode do in a voltage regulator?
Voltage regulator diodes utilize the reverse characteristics of a pn junction. When raising reverse voltage of pn junction diodes, high current starts flowing at a certain voltage, and constant voltage can be obtained. (This phenomenon is called breakdown and this voltage is called breakdown voltage.)
Which IC can be used as both positive and negative voltage regulator?
78xx and 79xx ICs can be used in combination to provide positive and negative supply voltages in the same circuit.
What happens if you wire voltage regulator backwards?
The only way to destroy a regulator is to apply reverse voltage to its input. Reverse polarity destroys the regulator almost instantly. If the supply is connected the wrong way around, the regulator will be protected from damage. A Protection Diode on the power supply input line.
What is a diode regulator?
A Zener diode voltage regulator is an electronic circuit that uses a Zener diode to maintain a constant DC output voltage. An ideal regulator would output a constant voltage regardless of input fluctuations or variation of load current.
Which of the following diode is used as a voltage regulator?
Zener diode
Notes: Zener diode is a special purpose semiconductor diode, named after its inventor C. Zener. It is designed to operate under reverse bias in the breakdown region and used as a voltage regulator.
What is positive and negative voltage regulator?
A positive adjustable voltage regulator produces a regulated positive voltage that can be adjusted. Most regulators are fixed (not adjustable). A negative adjustable voltage regulator produces a regulated negative voltage that can be adjusted.
Which series is used for negative voltage regulator?
series 79XX regulators
Fixed-Negative Voltage Regulator: The series 79XX regulators are the three-terminal IC regulators that provide a fixed negative output voltage.
What happens if you connect wrong polarity?
If your outlet’s polarity is reversed, it means that the neutral wire is connected to where the hot wire is supposed to be. This may not sound like a terrible thing, but it is. There is always electricity flowing out of an outlet with reversed polarity, even if an appliance is supposed to be off.
What is LM317 IC used for?
LM317 is a three-terminal voltage regulator IC, with a high output current value of 1.5A. The LM317 IC has many features such as current limiting, thermal protection, and safe operating area protection. It can also provide a float function for high voltage uses.
What is the output voltage of a LM317 voltage regulator?
It is capable of providing an excess current of 1.5A, hence it is conceptually considered as an operational amplifier with an output voltage ranging from 1.2V to 37V. The LM317 voltage regulator circuit internally consists of thermal overload protection and short circuit current limiting constant with temperature.
What is the program resistor for the lm117?
This calculator will work for most DC Voltage Regulators with a reference voltage (VREF) of 1.25. Typically, the program resistor (R1) is 240 ohms for the LM117, LM317, LM138, and LM150. Some said Iadj is very low current. So, we may reduce it down.
What is voltage regulation in power supply system?
The voltage regulation in a power supply system can be achieved using an electrical or electronic device called as voltage regulators. There are different types of voltage regulators such as Fixed voltage regulators and Variable voltage regulators.