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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. :

Generate 0.5v Negative Supply -  A while back someone needed a simple way to generate a negative 0.5v supply from a conventional transformer type AC to DC power supply.  The circuit below uses a couple Schottky diodes and a filter capacitor to perform the feat . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2011

High DC Current Indicator -  A while back, someone requested a simple method to indicate when 20 to 50 amps of DC current was flowing through a wire.  The circuit below works well and is about as simple as you can get.  A sensitive reed relay . . . Hobby Circuit designed by David A. Johnson P.E.-April, 2005

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Easy Power Supply -  I have done some work with DC PSUs over the past few months but some of the designs were either complex or "basic performers".  I therefore decided that it was about right to produce a bench PSU that was simple enough to be made into another kit and have a reasonable performance too. __ Designed by Harry Lythall-SM0VPO

Efficiency characteristics of Switching Regulators -  AN46 Efficiency varies for different DC/DC converters.  This App Note compares the efficiency characteristics of some of the more popular types.  Step-up, step-down, flyback, negative-to-positive, and positive-to-negative are shown.  Appended sections discuss how to select the proper aluminum electrolytic capacitor and explain power switch and output diode loss calculations.  __ Linear Technology/Analog Devices

Emergency strobe flasher generates 250V -  08/05/99 EDN Design Ideas:  Figure 1 shows a complete circuit for an emergency lamp that operates from a 12V automotive battery.  The xenon flash tube requires a 250V-dc anode voltage and a 4-kV trigger pulse.  To generate the 250V dc, IC 1,  __ Circuit Design by Jose Luis Arce, Tecnosuma Havana, Cuba

Energy Harvesting Converter Operates from a Variety of Weak Sources -  The LTC3129 is a high efficiency, 200mA buck-boost DC/DC converter with a wide ViN and VOUT range.  it includes an accurate RUN pin threshold to allow predictable regulator turn-on and a maximum power point control (MPPC) capability that ensures maximum power extraction from non-ideal power sources such as photovoltaic panels.  __ Linear Technology/Analog Devices App Note, Feb 15th 2013

Ep68 3.3 V 2 a DC-DC Power Supply -  This design kit is a 3.3  V / 2 A (6.6 W) DC-DC converter that is based on a DPA423G device.  This design is intended as an evaluation platform for DPA-Switch devices in the low cost surface-mount Dip package.  __ 

Ep-71 3.3 V 2 a DC-DC Power Supply -  This design kit is an isolated 3.3  V, 2 A (6.6 W) DC-DC converter utilizing a DPA423G.  This design is intended as an evaluation platform for DPA-Switch devices in the 8-pin Dip, low cost surface-mount package.  __ 

 EPR-000014 9 V 0.33 a 3 W Tny264 Adapter -  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.  __ 

Epr-54 Linkswitch 2.75 Watt Low Cost Charger/Adapter -  This design kit is a 5.5 V, 500 mA charger/adapter power supply.  The power supply utilizes the LinkSwitch LNK520 device, optimized for bias winding feedback.  The LinkSwitch integrates a 700 V MOSFET, PWM controller, start-up, thermal shut-down, and fault protection circuitry.  __ 

Experimental Alternator Controller -  Here is the schematic for the automatic charger I have been using for my kids' battery cars.  The charger is a small molded unit that probably doesn't supply more than an amp and this circuit would have trouble with much more.  No current limit is provided by this circuit - it relies on the charger for that.  The circuit could be modified to provide more current by scroll down to find this one __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Extend low-output-voltage switching regulator's input range -  01/04/07  EDN Design Ideas:  Switching regulator improves efficiency and allows 36V input __ Circuit Design by Hua  Walker Bai, Linear Technology, Milpitas, CA

Extend the input range of a low-dropout regulator -  10/17/02  EDN Design Ideas:  Because of process limitations, all ICs  have an input-voltage limitation.  This limitation can be cumbersome when you try to step down a high supply voltage to a lower, regulated voltage using a DC/DC converter, such as a linear re __ Circuit Design by Jeff Falin, Texas Instruments, Dallas, TX

Finesse Regulator Noise -  System designers often find themselves battling power supply hum, noise, transients, and various perturbations wreaking havoc with low noise amplifiers, oscillators, and other sensitive devices.  Many voltage regulators have excessive levels of output noise including voltage spikes from switching circuits and high flicker noise levels from unfiltered references __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Fixed Voltage Power Supply -  The fixed voltage power supply is useful in applications where an adjustable output is not required.  This supply is simple, but very flexible as the voltage it outputs is dependent only on the regulator and transformer you choose.  The maximum output current is 1.5A __ Designed by Aaron Cake

Fixed Voltage Regulators -  Use a voltage regulator to obtain a fixed voltage supply (at <1.5 Amps) from a variable source.   __ Designed by REUK-Renewable Energy UK website

Flasher/Dimmer Lantern -  The electronic lantern control circuit adds high-efficiency dimming and flashing to an existing battery-powered lantern or flashlight or to a custom design.  For the car it makes a great lamp for changing a flat tire, back seat reading or emergency engine work.  The flasher mode __ Designed by Tony van Roon  VA3AVR

Floating Input Extends Regulator Capabilities -  DN21 Design Notes __ Linear Technology/Analog Devices

Floating Supply for LCD Panel Meter -    NOTE: Scroll down - Did you ever install one of those low-cost LCD panel meters in a project only to discover that it requires a floating power supply? I just did!  The meter cannot share a DC ground with the voltage to be measured. The above circuit came to the rescue. it draws about 4 or 5 mA from the 9 volt supply and can supply up to 2 mA at 9 volts to the LCD meter or other load but the two capacitors isolate the grounds. Works like a champ!   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Flyback switcher works down to 1.1V, flashes HBLEDs -  EDN Design Ideas:  11/03/2014     Check out this DI if you need voltage step-up from a single cell.   This Design idea shows a way to drive low-power electronic circuits using a single 1.5V cell.  The design is based on a free-running oscillator that drives a flyback transformer to  generate a controllable higher voltage.  it can be used to power analog circuitry, microcontrollers, and any other light loads. __ Circuit Design by R O Ocaya

Fully Isolated, Single Channel Voltage & 4 mA to 20 mA Output with HART  -  Start the EVAL-CN0321-SDPZ software and proceed through any dialog boxes that appear.  Software The main software window is shown in Figure 3.  From the HART tab, data can be entered into the Command box and sent over the 4 mA to 20 mA loop, and the software can be set to poll for any data on the 4 mA to 20 mA loop__ Analog Devices from the Lab

GainClone Monoblocks -  impressed with the LM3875, I decided to build four mono-block amps.  I never got around to building them in the end, but maybe the write-up of my experiments might be useful. __ Designed by Mark Hennessy

Generate 0.5v Negative Supply -  A while back someone needed a simple way to generate a negative 0.5v supply from a conventional transformer type AC to DC power supply.  The circuit below uses a couple Schottky diodes and a filter capacitor to perform the feat . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2011

Generating Negative 5 Volts from 9 Volt Battery -  A 555 timer can be used to generate a squarewave to produce a negative voltage relative to the negative battery terminal.  When the timer output at pin 3 goes positive, the series 22 uF capacitor charges through the diode (D1) to about 8 volts.  When the output switches to ground, the 22 uF cap discharges through the second diode (D2) and charges the 100 uF __ Designed by Bill Bowden

Get buck-boost performance from a boost regulator -  07/11/02 EDN Design Ideas:  The SEPIC  (single-ended, primary-inductance-converter] topology is generally a good choice for voltage regulators that must produce an on output voltage that falls in the middle of the input-voltage range, such as a 5V output from a 2.7 to 6V input, The topology has some disadvantages, however.  The efficiency of a SEPIC  circuit fares worse than that of buck and boost regulators, and SEPIC  design __ Circuit Design by Tom Gross, Linear Technology Corp, Milpitas, CA

Get power out of PC parallel port -  An article which includes circuits, shares how to us a parallel port to connect to a very wide selection of devices like software protection dongles, removable disks, modems, network adapters, printer sharing units, parallel port extenders, soundcards, electronic telecard readers and many circuits.   __ Designed by Tomi Engdahl

Heavy-duty power supply regulates either voltage, current, or power -  05/05/75  EDN Technical Article:     By combining switching and series-pass techniques, this high-voltage supply's designer achieved 0.01% regulation at power levels to 100W.   __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Hex Inverter Makes Low Cost Switching Regulator -  05/23/96 EDN Design Ideas:  Simple and low-cost circuit converts5V to12V __ Circuit Design by Dimitry Goder, Switch Power Inc, San Jose, CA

High Current LM317 Regulated Power Supply -  The high current regulator below uses an additional winding or a separate transformer to supply power for the LM317 regulator so that the pass transistors can operate closer to saturation and improve efficiency.  For good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors should be close to the output voltage.  __ 

High Current Power Supply -  Since my page was first posted, I have received a number of emails asking about a high current power supply.  I looked around, but couldn't find one that was suitable.  So, I designed this.  it is a linear supply, which might have a few of you rolling your eyes, but it takes very few parts, is simple to build and can supply huge currents __ Designed by Aaron Cake

High Current Regulated Power Supply -  The high current regulator below uses an additional winding or a separate transformer to supply power for the LM317 regulator so that the pass transistors can operate closer to saturation and improve efficiency.  For good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors should be close to the output voltage.  The LM317 requires a couple extra volts on the input side, plus the emitter/base drop of the 3055s, plus whatever is lost across the (0.1ohm) equalizing resistors (1volt at 10 amps) , so a separate transformer and rectifier/filter circuit is used that is a few volts higher than the output voltage __ Designed by Bill Bowden

High Current Regulated Supply -  Current of LM317 voltage is increased by using an additional power transistors.  __ 

High Current Regulated Supply By LM317 -  The high current regulator below uses an additional winding or a separate transformer to supply power for the LM317 regulator so that the pass transistors can operate closer to saturation and improve efficiency.  For good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors__ 

High Current Voltage Regulation -  Connect voltage regulators in parallel to increase the current which can be regulated.   __ Designed by REUK-Renewable Energy UK website

High DC Current Indicator -  A while back, someone requested a simple method to indicate when 20 to 50 amps of DC current was flowing through a wire.  The circuit below works well and is about as simple as you can get.  A sensitive reed relay . . . Hobby Circuit designed by David A. Johnson P.E.-April, 2005

High Efficiency Dual 13A or Single 26A μModule Regulator -  Linear Technology's LTM4620 uses a proprietary lead frame design to package high power regulators into a very small form factor with effective thermal conduction through the top and bottom of the µmodule product.  The device can be connected in parallel to support higher current applications with very accurate current sharing__ Linear Technology/Analog Devices App Note, Eddie Beville-Design Manager uModule Products Sep 10th 2012

High Efficiency Linear Regulators -  AN32 Presents circuit techniques permitting high efficiency to be obtained with linear regulation.  Particular attention is given to the problem of maintaining high efficiency with widely varying inputs, outputs and loading.  Appendix sections review component characteristics and measurement methods.  __ Linear Technology/Analog Devices

High Efficiency Step-Down Switching Regulator -  DN73 Design Notes__ Linear Technology/Analog Devices

High Efficiency, UltraLow IQ, 42V, 2.5A Sync Buck Regulator -  The LT®8610 step-down regulator integrates key high performance features in one compact IC .  it offers synchronous rectification, for efficiencies up to 96%.  The low quiescent current of 2.5µA extends battery life and saves extra circuitry.  High speed switching minimizes board space and helps avoid EMI problems.  A low dropout __ Linear Technology/Analog Devices App Note, Leonard Shtargot Staff Engineer-Power Products Jun 14th 2012

High Voltage Breakdown Tester -  (Not for beginners!) The following circuit is used to determine the breakdown voltage of electronic components without causing permanent damage.  The circuit quickly ramps the high voltage up from zero and stops when the leakage current reaches a preset amount up to 100 uA.  When power is applied the two-transistor flasher circuit drives the complimentary-symmetry output stage with a square pulse at about 3 or 4 kHz (set by the 0.02 uF capacitor).  The output stage is connected to the speaker winding of an audio transformer from an old tube radio and the transformer steps the voltage up to about 250 VRMS .   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

High Voltage Buck Regualtors provide High Current Low Profile Power Solutions for FireWire Peripherals -  DN287 Design Notes__ Linear Technology/Analog Devices

High Voltage Generator for Low Current Applications -  Scroll to this one -- Here is a simple circuit for generating over 100 volts from a 12 volt source for powering low current devices and experiments.  The two transistors may be 2N4401 and 2N4403 or similar for lower power applications or higher power devices for heavier loads.  if more power is desired then lower the two 10 ohm emitter resistors to 3.3  ohms.  When driving power transistors, more drive may be achieved by adding two more gates and resistors in parallel with the two output gates shown.  Notice that the two driver gates are simply in parallel with 220 ohm current limit resistors in series with their outputs.   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

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

 


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