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Power Supplies:  DC to DC / Switch Mode and DC to DC Converters
Boost,    Buck,    Buck-Boost,    Switchmode

Power Supplies -- Main Page           Converters -- Main Page
DC to DC:  #'s - A       B - D       E - L       M - R       S - Z

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :
 Touch Switch Exciter - If you have hundreds of touch switches that need an excitation signal, then this circuit is what you need.  Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . Hobby Circuit designed by David 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:

Take the Mystery Out of the Switched-Capacitor Filter: the System Designer's Filter Compendium -  AN40 Linear Technology This note presents guidelines for circuits utilizing LTC's switched capacitor filters.  The discussion focuses on how to optimize filter performance by optimizing the printed wiring board, the power supply, and the output buffering of the filter.  Many additional topics are discussed such as how to select the proper filter__ Linear Technology/Analog Devices

Tandem hookups enhance utility of DC/DC unit -  01/02/97 EDN Design Ideas:  Designers whose applications demand increased power or nonstandard voltages have traditionally needed to use custom supplies or to compromise in the areas of component cost or pc-board space.  However, the flexibility you can gain by connecting isolated, compact DC/DC converters r __ Circuit Design by Simon Flatt, Pinnacle Marketing, Harrow, UK

Tapped inductor, boost regulator Deliver high voltage -  07/20/06  EDN Design Ideas:  Obtain 100V dc from a 3V source __ Circuit Design by David Ng and Adam Huff, Linear Technology Corp, Milpitas, CA

Ten Khz VFC uses Charge Pump Variation -  04/09/98 EDN Design Ideas:  (Several circuits included, scroll to find this one) A diode-capacitor charge pump is the starting point for many voltage-to-frequency-converter (VFC] designs.  The circuit in Figure 1 uses a variation on that classic theme to achieve linearity less than 0.05%, micropower operation of approximately 10-�A total draw from a 5 to 36V rail, and bipolar-input capability __ Circuit Design by Stephen Woodward, University of North Carolina, Chapel Hill, NC

Ten-Cent Charge Pump Provides LCD Bias -  Designing a product for low-power battery operation usually means maximizing the battery life by operating the circuit on as low of a supply voltage as possible.  This design used a custom LCD but, due to the number of display segments (160) , a__ 

Testing inductors at application frequencies -  Coilcraft RF Magnetics App Note- __ Designed by Coilcraft Power Magnetics Application Note

The Output adjustable Flyback converter -  A high voltage step-up DC power supply using adjustable flyback conversion.   __ Designed by Simon Inhwan Oh

Thermostat for 1KW Space Heater SCR controlled -  Below is a thermostat circuit I recently built to control a 1300 watt space heater.  The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer.  The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the SCRs, and the third winding is connected to a PNP transistor pair that alternately supply pulses to the transformer at the beginning of each AC half cycle.  The trigger pulses are applied to both SCRs near the beginning of each AC half cycle but only one conducts depending on the AC polarity. __ Designed by Bill Bowden

ThinSOT Micropower Buck Regulator has Low Output Ripple -  DN373 Design Notes__ Linear Technology/Analog Devices

Three parts provide tenfold increase in switcher current -  08/22/02 EDN Design Ideas:  industrial-control circuits often derive their power from widely varying sources that can exceed the 40V maximum rating of popular switching iCs.  This design idea presents a simple, flexible, and inexpensive buck switcher that converts an input voltage as high as 60V to 5V at several amps.  The circuit is unique in that it boosts current with almost no compromise in performance, size, or cost __ Circuit Design by Wayne Rewinkel, National Semiconductor, Sunnyvale, CA

Three Phase Voltage Multiplier -  The Cockcroft-Walton turbine voltage multiplier.   __ Designed by REUK-Renewable Energy UK website

Three-Band Equalizer -  Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high.  With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz.  Supply voltage may be anything from 6 to 30 Volts.  Maximum boost 20dB is only realized with maximum supply voltage __ Designed by Andy Collison

Three-Channel White-LED Driver Uses Simple Circuit Step-Down DC/DC Converter -  09/13/12  EDN Design Ideas:  Drive multiple LEDs with current mirrors from a single step-down converter.   __ Circuit Design by Nora Jacalan Esteves, Technor Semiconductor LLC, Pleasanton, CA

Three-Input Supply Powers 3.3V Portable -  04/13/95 EDN Design Ideas:  The single-ended primary-inductance converter in Fig 1 accepts input voltages ranging from 3 to more than 6V and produces a regulated 3.3 V, 200-mA output.  The converter accepts an input voltage from three sources a 5V dc wall cu __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

Tiny & Efficient Boost Converter Generates 5V at 3A from 3.3V Bus -  DN280 Design Notes__ Linear Technology/Analog Devices

Tiny Buck Regulator Accepts Inputs from 3.6V to 25V & Eliminates Heat Sink -  DN268 Design Notes__ Linear Technology/Analog Devices

Tiny Charge Pump Provides Highly Reliable Low Cost Solution to Negative Reference Voltage -  App Note #348__ Maxim Integrated

Tiny Highly Flexible Dual Boost/Inverter Tracks Supplies -  DN357 Design Notes__ Linear Technology/Analog Devices

Tiny Microcontroller Hosts Dual DC/DC-Boost Converters -  05/15/08  EDN Design Ideas:  An Atmel AVR microcontroller can serve as the PWM controller for two DC/DC converters that provide high voltages from a two-cell supply __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

Tiny Step-Up/Step-Down Power Supply Delivers 3.3V at 1.3A in Battery-Powered Devices -  DN271 Design Notes__ Linear Technology/Analog Devices

Tiny Versatile Buck Regulators Operate from 3.6V to 36V Input -  DN367 Design Notes__ Linear Technology/Analog Devices

Touch Switch Exciter -  if you have hundreds of touch switches that need an excitation signal, then this circuit is what you need.  its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

TPS6102x Boost Converter Down Conversion Mode -  Ti App Note __ 

TPS61042 White Light LED Driver Boost Converter Rev. A -  Ti App Note __ 

Trading Performance for Cost in Portable Power Supplies -  App Note #269__ Maxim Integrated

Transformer Buys Lower Shutdown Current -  11/23/94 EDN Design Ideas:  The step-up DC/DC converter in Fig 1 trades a slight loss in efficiency and a transformer in place of a less expensive inductor for two important advantages  The inductor offers low shutdown current because the transformer eliminates a leakage path.  The circuit stays in regulation, even __ Circuit Design by Terry Millward, Maxim Integrated Products, Reading, UK

Transformerless DC/DC converter produces bipolar outputs -  29-Apr-04 EDN Design Ideas:  The conventional way to produce dual (positive and negative] outputs from a single positive input is to use a transformer.  Although such designs are relatively simple, the transformer inherently introduces the problem of size.  it can be challenging to fit a transformer into an application in which it's important to minimize the circuit footprint and height __ Circuit Design by David Kim, Linear Technology Corp, Milpitas, CA

Transformerless Power Supply -  i have had several requests for a power supply project without using a power supply. This can save the expense of buying a transformer, but presents potentially lethal voltages at the output terminals.Under no circumstances should a beginner attempt to build such a project. Please also read the Disclaimer on this site. __ Designed by Ron J

Transformerless supply fits CATV applications -  05/22/97 EDN Design Ideas:  Coaxial CATV systems derive their power from a 60-Hz square wave that shares the center conductor with the television channels.  You often need to place active devices along the distribution path.  if the dc-power requirements for these devices are small, you can use a transformerless power supply __ Circuit Design by Michael Ellis, Antec Technology Center, Norcross, GA

Transistor Boosted Relay -  This relay driver boosts the input impedance with a regular 2N3904 transistor (or equivalent).  Very common driver.  it can drive a variety of relays, including a reed-relay, and is non-latching. 
Transistor Q1 is a simple common-emitter amplifier that increases the effective sensitivity of the 12 volt relay coil about a 100 times.   __ Designed by Tony van Roon  VA3AVR

Transistor paIR lowers PWM IC's start-up current  -  03/18/99 EDN Design Ideas:  An auxiliary winding usually provide as power for the popular  UC384X-based offline switch-mode power supplies (SMPSs).  This winding feeds  the main PWM controller.   PDF contains multiple circuits, scroll to find this circuit.    __ Circuit Design by Christophe Basso, Motorola Semiconductor, Toulouse, France

Transistors tame peRFIDious leakage inductance -  09/27/01 EDN Design Ideas:  in flyback converters that use primary regulation, the loose coupling between the power secondary and the primary auxiliary windings often results in poor cross-regulation.  This situation arises mainly from the leakage inductance but also comes from the level of the primary clamp voltage.  Figure 1 shows a typical application schematic using On Semiconductor's (www __ Circuit Design by Christophe Basso, On Semiconductor, Toulouse, France

TRIAC lighting & heating controller uses few parts -  09/02/04  EDN Design Ideas:  The TRIAC lighting-control circuit in Figure 1 is small and inexpensive because load and housekeeping power come directly from the line voltage, thereby eliminating bulky, expensive supplies.  The CLZD010 closed-loop controller maint __ Circuit Design by David Caldwell, Flextek Electronics, Carlsbad, CA

Triple Capacitive Voltage Inverter with the Max871 -  App Note #1875__ Maxim Integrated

Triple Output Power Supply (5V, 15V,-10V) for LCD Displays -  From 2.7V to 4.2V, the LT1944-1 generates 3 supplies (5V AT 40mA, 15V AT 2.5mA, -10V AT 1mA) required to bias a small LCD display__ Linear Technology/Analog Devices App Note, Mar 24th 2010

Triple output Telecom DC/DC converter power supply -  This power supply was designed and delivered in less than 2 weeks for a client that had designed in a long lead time, custom supply from an overseas source.  Leveraging the clients existing parts inventory and parts directly available from local distributors this supply was designed and sent out for fabrication in 2 days, thereby preserving their prototype schedule. __ Designed by Steve Hageman

Tripler converts 5 to 15V -  08/17/00 EDN Design Ideas:   By configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1).  A 15V rail is useful for powering op amps, LCD-bias circuits and other low-current applications.  The connections shown configure the iC1 voltage doubler as a tripler.  The no-load output voltage of the circuit is approximately 3ViN–2VD,  __ Circuit Design by Ken Yang, Maxim Integrated Products, Sunnyvale, CA

Tripler Converts 5 Volt to 15V -  App Note #297 By configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1).  A 15V rail is useful for powering op amps, LCD-bias circuits, and other low-current applications.  The connections shown configure the iC1 voltage doubler as a tripler.  The no-load output__ Maxim Integrated

Turn an ordinary wall wart/ plug-pack into a regulated Device -  Plug Packs can be found everywhere.  They are strong and reliable and most important, they are safe.  They consist of a transformer enclosed in a plastic case with 2 or 3 pins at one end that can be plugged directly into a power point.  They come __ Designed by Collin Mitchell

Two 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

Two Amp variable power supply -  This handy power supply has an output of 0v to 12v at 700mA with a transformer that is rated at 1-amp (such as M-2155) or 1.4amp for a transformer that is rated at 2-amp (such as M-2156).  Your local electronics shop or model railway supply will have these __ Designed by Collin Mitchell

Two Channel Gate Driver for Large IGBT Modules -  The BG2A is a fully isolated two channel gate drive Circuit designed for use with dual iGBT modules.  The BG2A utilizes Powerex VLA500-01 or VLA502-01 hybrid gate drivers to provide efficient switching of modules rated up to 1400A.  The hybrid gate driver features a built-in high speed opto-coupler, short circuit protection and an isolated DC to DC converter with 2500VRMS isolation.  __ 

Two Cores Marry, Make Swinging Choke -  05/11/95 EDN Design Ideas:  Designing an output choke for a switch-mode power supply that must operate over large load variations can be problematic.  if you design the inductor for the maximum load the power converter will see, the inductance will be below the critical inductance required at light load.  This inadequate inductance will cause the voltage on the output capacitor to peak up, resulting in increased ripple on the output __ Circuit Design by Vincent Spataro, GEC Marconi Electronic Systems Corp, Wayne, NJ

Two Farad, 5V SuperCap charger from a 3.3V input -  The LTC3459 controls peak inductor current when ViN is greater than or less than VOUT.  This allows current to be controlled during start-up in a boost application or VOUT to be regulated below ViN when powered from a fresh battery.  Peak current control makes the LTC3459 an ideal candidate for charging a back-up source such__ Linear Technology/Analog Devices App Note, Mar 23, 2010

Two 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).  SEPiCs offer lower input-curre __ Circuit Design by Goran Perica, Linear Technology App Note, Milpitas, CA

Two Transistor FM Transmitters -  While there are a plethora of similar 2-transistor schematics available, this one is above average.  A major improvement over a little 1-transistor circuit that we've discussed previously, this transmitter consist of two stages.  first transistor is used to amplify audio, __ 

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DC to DC:  #'s - A       B - D       E - L       M - R       S - Z


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