1.25V to 120V Mains Adjustable Voltage Regulator Circuit _ Homemade Circuit Projects.pdf

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3/10/2020
1.25V to 120V Mains Adjustable Voltage Regulator Circuit | Homemade Circuit Projects
Homemade
120V Mains
1.25V to
Circuit
Projects
Adjustable Voltage Regulator Circuit
Last Updated on June 20, 2019 by Swagatam (https://www.homemade-circuits.com/author/swag/)
The TL783 is a variable three lead mains voltage regulator chip having an output range of 1.25 V to 125 V and a
DMOS output transistor which is able to handle in excess of 700 mA current.
High Voltage Specification
It is specifically configured internally for working with high-voltage applications where ordinary bipolar voltage
regulators become useless.
High grade performance specifications, much enhanced than most bipolar regulators are implemented through a hi-
breed circuit network and sophisticated layout technology.
In this innovative regulator device, the TL783 integrates the standard bipolar circuit technology with high-voltage
double-diffused MOS transistors on one chip, to create a device attributed with properties for enduring higher voltages
far higher than traditional 78XX bipolar integrated circuits.
Due to the inability of secondary-breakdown and thermal-runaway situations inherently common with bipolar devices
these become quite vulnerable to high voltages, unlike these the TL783 ensures full overload protection even under
extreme operating conditions ranging up to 125 V across input to output.
Built-in Current Limiter
The chip also includes an in-built current limiting feature, a safe operating area safeguard and also a thermal
shutdown feature.
In a worst case even if the ADJ gets isolated accidentally, all the above protection features stay functional.
The IC can be initiated and made functional just by adding a couple of external passive components. An input bypass
capacitor becomes only essential in case the DC supply source is fetched from beyond 6 inches from the IC.
The IC also exhibits excellent response to sudden output short circuits and sudden voltage spikes or transients.
Circuit Diagram
https://www.homemade-circuits.com/125v-to-120v-mains-adjustable-voltage/
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WARNING: PLEASE REMOVE THE 100uF/250 CAPACITOR FROM THE INDICATED POSITION AND PLACE IT
ACROSS THE OUTPUT TERMINALS OF THE CIRCUIT, THIS WILL ENSURE THAT THE 120V INPUT DOESN'T
GET TRANSFORMED INTO A DANGEROUS 160V PEAK AND DAMAGE THE IC.
DataSheet PDF Search Site.
Download Datasheets for Free.
Offers you a great collection of semiconductor datasheet.
datasheetspdf.com
OPEN
THE GROUND SYMBOLS SHOWN WITH THE NEGATIVE LINE OF THE ABOVE CIRCUIT SHOULD NOT BE
MISTAKEN WITH "EARTHING" OF THE 3-PIN SOCKET. THE GROUND SYMBOLS ARE ONLY FOR
HIGHLIGHTING THE NEGATIVE LINE OF THE BRIDGE RECTIFIER.
https://www.homemade-circuits.com/125v-to-120v-mains-adjustable-voltage/
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https://www.homemade-circuits.com/125v-to-120v-mains-adjustable-voltage/
3/11
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1.25V to 120V Mains Adjustable Voltage Regulator Circuit | Homemade Circuit Projects
CAUTION: THIS CIRCUIT IS NOT ISOLATED FROM MAINS AND THEREFORE IS EXTREMELY DANGEROUS TO
TOUCH WHILE POWERED AND IN AN UNCOVERED SITUATION.
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About Swagatam
I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer,
manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/,
where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!
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Comments
Sh@@n (https://www.blogger.com/profile/06579013510859318364) says
Hi sir, Shaan here, Hope you are fine by grace of god. I need your help, is there any circuit to regulate 100v AC voltage to desired AC
voltage (AC-AC stepdown controller)? If any idea then plz do share with me. Thanks in advance..
Reply
Swagatam (https://www.blogger.com/profile/13783312838408713408) says
Hi Sir,
If it's an SMPS type of regulator you are looking for, then I think you could try the following one:
https://homemade-circuits.com/2017/07/110v-14v-5v-smps-circuit.html (https://homemade-circuits.com/2017/07/110v-14v-5v-smps-
circuit.html)
Reply
https://www.homemade-circuits.com/125v-to-120v-mains-adjustable-voltage/
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