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Voltage Regulator Circuits

Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S      
T - Z

 

Last Updated: 09/14/2017 03:19 PM

Circuits Designed by Dave Johnson, P.E. :
0.5v to 6v Voltage Converter -  Conventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very . . . Hobby Circuit designed by David Johnson P.E.-May, 2007

0VAC to 280VAC Variable Isolated AC Voltage -  I designed and built this circuit about 25 years ago.  it came in handy for many projects that were powered from 120 VAC, 240 VAC and 277 VAC.  it provides complete isolation from the power line.  it uses two 1:1 isolation transformers that are wired in parallel . . . Hobby Circuit designed by David Johnson P.E.-July, 2000

12v to 19v Laptop Power Supply (Concept) -  Concept Only.  I have a big screen HP laptop computer.  The large brick size AC to DC power supply is rated at 19.2v and 9.5 amps, which is about 180 watts.  I'd like to be able to use the thing in my car.  I looked into a 12v car adapter for it but never really found one that I liked.  Most were underpowered.  The other option was to use the existing AC to DC adapter and run it off power from a 12v to 120vac inverter. . . Circuit by David Johnson P.E.-July, 2009

12v-24v AC & DC Day/Night Switch -  The circuit uses a bridge rectifier circuit to convert AC into DC.  A 12v zener diode limits the operating voltage of the circuit to 12v.  A tiny Schmitt trigger inverter and a phototransistor detects the ambient light intensity.  if there is sufficient light, the inverter disables a push-pull oscillator circuit . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2012

240VAC to 5VDC Power Supply -  This is simple way to power some 5v logic from a 240vac source.  if a 120vac power adapter is used, the circuit will also work for 120vac power lines. . . Circuit by David Johnson P.E.-February, 2002

5+V Classic Linear Supply using 6.3VAC Transformer -  A classic method for producing a regulated +5v DC supply is shown below.  This circuit consists of an iron core transformer, a bridge rectifier, a filter capacitor and a voltage regulator.  Many people are tempted to use a very popular 6.3v transformer . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2009

9v Battery Eliminator -  if you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David Johnson P.E.-December, 2009

AC to DC (240v to 5v)Power Supply -  This is simple way to power some 5v logic from a 240vac source.  if a 120vac power adapter is used, the circuit will also work for 120vac power lines . . . Hobby Circuit designed by David A. Johnson P.E.-February, 2002

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13 VDC to 120 VAC Inverter -  This inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000 (1 KW) watts __ Designed by Aaron Cake

13.8 Volt 20A PSU -  This is a Regulated DC power supply with short circuit protection and with current limiter.   __ Designed by Andy Collison

13.8V 10A power supply -  Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers.    __ Designed by N1HFX

13.8V 20A Power Supply -  Regulated DC power supply, short circuit safe, and with current limiter.  This PSU has been especially designed for current-hungry ham radio transceivers.  it delivers safely around 20Amps at 13.8V.  For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added.  Let us see what we have got here.  The power transformer should be capable to deliver at least 25A at 17.5 to 20V.  The lower the voltage, the lower power dissipation.   __ Designed by Bob

13.8V 20A PSU -  This is a Regulated DC power supply with short circuit protection and with current limiter.   __ Designed by Andy Collison

13V-30Vin to +/-5VAT500mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 2.5A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

14 VDC to 120 VAC Inverter -  This inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000 (1 KW) watts __ Designed by Aaron Cake

150V, 100mA Step-Down Regulator Requires Only Three External Components -  The LTC3639 step-down regulator integrates key high performance features into one compact IC .  it is capable of up to 150V input voltage and 100mA output current, utilizing synchronous rectification and low quiescent current to maintain high efficiency over a broad spectrum of load current.  its adjustable output can be programmed__ Linear Technology/Analog Devices App Note, Jason Leonard Design Engineering Manager-Power Products Jun 18th 2013

15-48V 15A SMPS -  A cheap, powerful, regulated bench supply made entirely from recycled junk.__ 

16-bit adjustable reference uses 8-bit digital potentiometers -  12/25/03 EDN Design Ideas:  it may be easy to find a precision voltage reference for your application; however, a programmable precision reference is another matter.  The circuit in Figure 1 yields a precision reference with an LSB of 62.5 µV.  The circuit is a 16-bit DAC using three 8-bit digital potentiometers and three CMOS op amps __ Circuit Design by Bonnie Baker, Tucson, AZ

1A Variable Regulated Power Supply -  A 'must-have' for the experimenter. __ Designed by Peter Parker VK3YE

2 AA cells power step-down regulator -  01/07/99 EDN Design Ideas:  (Scroll to find this one) DC/DC conversion is particularly challenging when both the input and output voltages are low.  Step-up ICs  that operate with inputs lower than 1V are available, but step-down ICs  that accept input voltages   Page includes several designs.   __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

2 AA Cells Power Step-Down Regulator & 3.3V Boost -  Stepping down from low voltage inputs like 2 AA cells is challenging.  This circuit provides one solution to generate 1.5V at 600mA and also supplies 3.3 V at 200mA.   __ Designed by Len Sherman-Maxim Application Note 256

2 AA Cells Provide CCD Positive & Negative Supply & Three White LED Backlight LED Driver -  The LT3587 provides a complete biasing solution for CCD (12V AT 10mA, -8V AT 20mA) and LED backlighting from 2 AA cells __ Linear Technology/Analog Devices App Note, Mar 24, 2010

2 ICs Convert 4 20mA Signal to 0 5V Output -  App Note/ 823 / Jul-09__ Maxim Integrated

2 Phases to Cut Current & Improve EMI -  11/12/09 EDN Design Ideas:  in DC/DC-converter applications in which the input voltage may be lower or higher than the output voltage, you can use either a flyback converter or a SEPIC  (single-ended-primary-inductor converter).  SEPIC s offer lower input-current __ Circuit Design by Goran Perica, Linear Technology App Note, Milpitas, CA

2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -  Switching Regulator__ Linear Technology/Analog Devices

2.7V to 4.2V to-5V at 90mA & 4.6V at 100mA AM OLED Power Supply -  LT3582 are dual DC/DC converters with positive and negative outputs.  The positive output voltage can be set between 3.2V and 12.775V in 25mV steps.  The negative output voltage can be set between –1.2V and –13.95V in –50mV steps.  Optional i2C Programming__ Linear Technology/Analog Devices App Note, .Mar 24th 2010

200W AdvancedTCA Hot Swap Controller -  The LTC4252 negative voltage Hot Swap controller allows a board to be safely inserted and removed from a live backplane.  Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault __ Linear Technology/Analog Devices App Note, Mar 26th 2010

231 Volt Dimmer -  Find out how to put together a simple but efficient PWM dimmer circuit for LEDs.   __ Designed by REUK-Renewable Energy UK website

240VAC to 5VDC Power Supply -  This is simple way to power some 5v logic from a 240vac source.  if a 120vac power adapter is used, the circuit will also work for 120vac power lines. . . Circuit by David Johnson P.E.-February, 2002

24V/48V Hot Swap™ Controller -  DN226 Design Notes__ Linear Technology/Analog Devices

24Vin to 1.2Vout AT 15A using Inductor DCR Sensing to Minimize Solution Size & Cost -  This circuit shows a typical application of the LTC3613, configured for DCR sensing in a high step-down solution, 24V to 1.2V, and synchronized to a 350kHz external clock.  __ Linear Technology/Analog Devices App Note, Jun 29th 2012

24Vin to 5VoutAT0.7A Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3573 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary-side flyback waveform.  A 1.25A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

2500W Phase Control -  This circuit controls resistive and inductive loads up to 2, 500W.  its main functional device is an integrated phase control circuit - Siemens TLE3103.  it contains its own power supply, a zero voltage crossing detector circuit and __ Designed by Hans-Juergen Zons

26V-to-5000V DC-DC Converter -  This circuit can provide 5, 000 VDC from 26 VDC.  This circuit has ripple of under 0.01% due to Voltage-doubling capacitors.  As sinusoidal oscillator, a 2N217 transistor is used.  The diode and the capacitors at the output stage should be of high voltage type.  __ 

2-Phase Dual Switching Regulator Fits in Tight Places -  DN210 Design Notes__ Linear Technology/Analog Devices

2-Step Voltage Regulation Improves: Design Notes Linear Technology -  DN209 Design Notes__ Linear Technology/Analog Devices

2-Wire Virtual Remote Sensing for Voltage Regulators -  Linear Technology AN126 __ Designed by Jim Williams - Oct 1st, 2010

–3.3V Negative Converter with 1A Output Current Limit -  The LT8611 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current.  Top and bottom power switches are included with all necessary circuitry to minimize the need for external components.  The built-in current sense amplifier with monitor and__ Linear Technology/Analog Devices App Note, Sep 13th 2012

3.3V Regulated Power Supply -  Among the power supplies presented here, this is a well regulated type that can deliver up to 1.5A current from a wide range of input voltage of 5V to 25V dc.  See LM317 calculator if you want to know how to get the 3.3 V output.   __ Designed by KB Kaminski

3-30 V/2.5 a Stabilized power supply -  This is a very useful project for anyone working in electronics.  it is a versatile power supply that will solve most of the supply problems arising in the everyday work of any electronics work shop.  it covers a wide range of voltages being continuously variable from 30 V down to 3 V.   __ Contact IQ Technologies

36V-72Vin to 12VoutAT2A Output, Isolated Telecom Supply (No Opto or Third Winding) -  The LT3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power.  it drives a low side external N-channel power MOSFET from an internally regulated 7V supply.  No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage__ Linear Technology/Analog Devices App Note, Jan 27th 2011

36VIN, 5.6A Two 2.5V Series Supercapacitor Charger -  The LTM8026 is a 36ViN, 5A constant-voltage, constant current (CVCC) step-down μModule regulator.  included in the package are the switching controller, power switches, inductor and support components.  Operating over an input voltage range of 6V to 36V, the LTM8026 supports an output voltage range of 1.2V to 24V.  CVCC operation allows the LTM8026 to accurately regulate its output current up to 5A over the entire output range.  The output current can be set by a control voltage, a single resistor or a thermistor.  Only resistors to set the output voltage and frequency and the bulk input and output filter capacitors are needed to finish the design__ Linear Technology/Analog Devices App Note, Feb 17th 2012

3A 2MHz Monolithic Synchronous Step-Down Regulator Provides a Compact Solution for DDR Memory Termination -  DN309 Design Notes__ Linear Technology/Analog Devices

3-Phase Rectifier & Voltage Reducer form a Offline Single-Phase Supplies -  EDN-Design ideas -- 04/06/12    Missing diodes create gaps to allow voltage reduction. __ Circuit Design by JB Castro-Miguens, Cesinel, Madrid, Spain; C Castro-Miguens, University of Vigo, Spain; M Pérez Suárez, University of Vigo, Spain; and A Abal Pena, Tekplus, Vigo, Spain

3V supply Delivers 12V p-p to piezo speaker -  10/16/03  EDN Design Ideas:  Low-profile piezoelectric speakers can provide quality sound for portable electronic devices, but they require voltage swings greater than 8V p-p across the speaker element.  Yet, most portable devices include only a low-voltage pow __ Circuit Design by Royce Higashi and Tony Doy, Maxim Integrated Products, Sunnyvale, CA

3V to 9V DC Converters -  Here are some 3V to 9V DC converter circuits that were requested by some of our visitors.  it may be helpful to have one of this converters when no 9V battery is available or if you consider that they are too expensive.  The first circuit is very simple, it uses the TL496 power supply controller, a coil and a electrolytic __ Designed by Popescu Marian

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Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S       T - Z

 


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