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Voltage Regulator Circuits

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

 

Last Updated: 11/30/2017 07:17 AM

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

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747




Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

4.3V to 42Vin 3.3V AT 5A Step-Down Converter -  The LT3976 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V.  Low quiescent current design consumes only 3.3 μA of supply current while regulating with no load.  Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output__ Linear Technology/Analog Devices App Note, Sep 12th 2012

4.5-28Vin to 2.5VoutAT6A Ultra Low Noise uModule Power Supply -  The LTM4606 is a complete EN55022 Class B certified noise high voltage 6A switching mode DC/DC power supply.  included in the package are the switching controller, power FETs, inductor, and all support components.  The on-board input filter and noise cancellation circuits achieve low noise operation, thus effectively reducing the electromagnetic interference (EMi).  Operating over an input voltage range of 4.5V to 28V, the LTM4606 supports an output voltage range of 0.6V to 5V, set by a single resistor__ Linear Technology/Analog Devices App Note, Apr 22, 2011

40V 2A LM317 & TIP42 Power Supply -  A very good and powerful Regulated Power Supply section was implemented by simply adding a PNP power transistor to the excellent LM317T adjustable regulator chip.  in this way this circuit was able to deliver much more than the power required to drive two Mini-MOSFET amplifiers to full output (at least 2AmpAT40V into 4 Ohm load) without any appreciable effort.  __ 

42V 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current -  11/26/13  EDN-Design Notes   Measure inductance & capacitance over a wide range.  The LT8610 and LT8611 are 42V, 2.5A synchronous step-down regulators that meet the stringent high input voltage and low output voltage requirements of automotive, industrial, and communications applications.  To minimize external components and solution size, the top and bottom power switches are integrated in a synchronous regulator topology, including internal compensation.  The regulator consumes only 2.5μA quiescent current from the input source even while regulating the output.   __ Circuit Design by Hua  Walker Bai

48Vin to +/-15VoutAT100mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3512 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform.  The device integrates a 420mA, 150V power switch, high voltage circuitry, __ Linear Technology/Analog Devices App Note, Apr 22, 2011

48Vin to +/-15VoutAT50mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform.  The device integrates a 240mA, 150V power switch, high voltage circuitry, __ Linear Technology/Analog Devices App Note, Jan 27th 2011

48Vin to 12VoutAT200mA Monolithic Isolated Flyback Controller (No Opto or Third Winding) -  The LT3512 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform.  The device integrates a 420mA, 150V power switch, high voltage circuitry, __ Linear Technology/Analog Devices App Note, Apr 22, 2011

48Vin to 5VoutAT0.3A Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform.  The device integrates a 240mA, 150V power switch, high voltage circuitry, __ Linear Technology/Analog Devices App Note, Jan 27th 2011

4MHz Monolithic Synchronous Step-Down Regulators Bring High Efficiency to Space-Sensitive Applications -  DN304 Design Notes__ Linear Technology/Analog Devices

5 V Regulator Supplies High Transient Current for Dynamic Power Controlled DAC  -  Follow the instructions contained in the Readme file for installing and using the evaluation software.  , Functional Block Diagram Figure 8 shows the test setup block diagram, and the EVAL-CN0198-SDPZ-SCH-RevX.  pdf file has the circuit schematics.  Connect the USB cable from the PC to the mini-USB connector on the SDP board and launch the evaluation software.  information and details regarding test setup and how to use the evaluation software for data capture can be found in the CN-0198 User Guide__ Analog Devices from the Lab

5 Volt Regulator -  Scroll for this one - You need to add a 5 volt regulator to power a USB device and this regulator needs to be a low-dropout type that consumes "micro" power so that it doesn't discharge the battery on its own.  There are commercial regulators like the TPS76750Q in the PWP package that will do the job with just a couple of good ceramic bypass capacitors. (There are a bewildering number of suitable regulator choices.) But if you like to build your gadget from parts on hand, below are a couple of circuits that will work. __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

5 Watt Universal Input Dual Output Isolated TNY266 -  This design kit is a 9 V, 0.33 A, 3 W output and universal input power supply utilizing the TNY264P.  For evaluation, a fully built and tested prototype (EP14) can be found within the Design Accelerator Kit, DAK-14.  __ 

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

500kHz 6a Monolithic Boost Converter LT1370 -  DN183 Design Notes__ Linear Technology/Analog Devices

50W Capacitor Charger -  An upgraded capacitor bank charger.5x better than the boost converter! __ 

555 DC Voltage Doubler -  This dc voltage doubler circuit produces a voltage that is twice its voltage supply.  This is useful when a higher voltage level is needed out of a single lower voltage power supply.  Since the current consumption levels are low in such cases, the circuit can be built with minimal resources.  Voltage Doubler Circuit Schematic The __ Designed by Popescu Marian

555 on 24v -  if you need to operate a 555 on 24v, you will need to reduce the voltage to less than 18v.  The following circuits reduce the voltage to 12v.  __ 555-Timer

555 Voltage Doubler Relay Driver -  These novel relay driver circuits have the ability to pick up a relay with a coil voltage rating equal to double Vcm.  After pickup, the relay armature is held via the application of Vcm.  Under this condition, the coil power is reduced by the square of the voltage ratio, or to 25%.  This is the ultimate in relay economy—the __ Designed by Jim Keith

5V High Current Step-Down Switchers -  The LT1241 current mode PWM control IC can be used to make a simple high frequency step-down converter.  This converter also has low manufacturing costs due to simple magnetic components.  This circuit exhibits a wide input range of 30V to 60V while maintaining its 12A 5V output.  it has short circuit protection and uses minimal PC board area due to its 300KHz switching frequency[DN59Design Notes (Linear Technology]__ Linear Technology/Analog Devices

5V power supply teams low-dropout regulator, charge pump -  8-Jan-04 EDN Design Ideas:  Auxiliary power of 3.3V is replacing the 5V auxiliary power that "silver boxes" supply in most computer systems, but some circuits still require a 5V supply.  Such systems impose the messy task of creating a central 5V auxiliary supply from the 3.3V auxiliary supply and then routing 5V power throughout the motherboard __ Circuit Design by Jim Christensen, Maxim Integrated Products, Sunnyvale, CA

5V powersupply -  This circuit will regulate voltage to 5V input range is 6V.12V.  The diode prevents the circuit being damaged when the input is connected the wrong way around.  The resistor and LED are optional, they are for power on indication__ 

5V to 3.3V Converters for Microprocessor Systems -  AN58 Many popular microprocessors operate from 3.3 V supplies, yet y are used in systems where predominate source of power is 5V.  AN58 presents a collection of both linear and switching regulator solutions for conversion of 5V to 3.3 V at currents ranging from 100mA to 20A.  Applications information and a comparison of various bypass capacitor__ Linear Technology/Analog Devices

5V, 2A Output from Automotive Input with Continuous Operation from 6V to 45V -  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

5Vin to +/-12VoutAT40mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3574 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 0.65A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

6 to 12 Volt Converter -  This circuit can provide up to 800mA of12V power from a 6 Volt supply.  The circuit is simple, about 75% efficient and quite useful __ Designed by Aaron Cake

6 Volt Power Supply -  Schematic only, no circuit description __ Designed by Andy Wilson

60V High Efficiency Buck Switching Regulators in SO-8 -  DN202 Design Notes__ Linear Technology/Analog Devices

725V DC Isolated Low Noise μModule Regulator -  The LTM8047 is an isolated flyback μModule DC/DC converter.  The LTM8047 has an isolation rating of 725VDC.  included in the package are the switching controller, power switches, transformer, and all support components.  Operating over an input voltage range of 3.1V to 32V, the LTM8047 supports an output voltage range of 2.5V__ Linear Technology/Analog Devices App Note, Mar 30th 2012

775 Nanovolt Noise Measurement for A Low Noise Voltage Reference -  Linear Technology AN124 __ Designed by Jim Williams - Jul 3rd, 2009

78xx Regulator Board -  circuit board and circuit for making voltage regulators based on 78xx IC s, in PDF format, text in Finnish__ 

80V, 98% Efficient, 4-Switch Synchronous Buck-Boost Controller IC with 4 Regulation Loops -  in today’s modern electronic systems, the need for power conversion circuits that can do more than simply convert one voltage to another is growing.  Some systems require a constant current, constant voltage output, while others may require a limit on the maximum current that can be drawn from the input.  Still others may__ Linear Technology/Analog Devices App Note, Albert Wu Design Engineering Manager-Power Products Feb 11th 2013

9 Volt 2 Amp PSU -  A simple 9 Volt 2 amp supply using a single IC regulator.   __ Designed by Andy Collison

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

9-V Stabilized Power Supply -  Schematic only __ Designed by Tony van Roon  VA3AVR

9V to 2A PSU -  A simple 9 Volt 2 amp supply using a single IC regulator.   __ Designed by Andy Collison

9V-30Vin to +/-5VoutAT350mA 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

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


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