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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. :

 High Power Touch Switch Exciter Circuit - 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. . . Circuit by Dave Johnson P.E.-February, 2002

 Laptop Power Supply - 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. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009

 LC Oscillator Medium Power 125Khz - This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . Hobby Circuit designed by David A. Johnson P.E.-March, 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:

H Bridge Motor control -  Before trying to understand a full bridge circuit, you may care to read up on PWM controllers, which page also describes how a half-bridge circuit works.  Most full bridge motor controllers also use pwm!  Designing a full-bridge PWM circuit that is reliable and 'user-proof' is actually quite difficult!  4QD released our first such controller in 1992: it was probably not the first but was certainly early in the race. __ Designed by Richard Torrens

Half Bridge Inverter has Variable Frequency -  10/09/97 EDN Design Ideas:  Modern electronic ballasts require added features, such as high-frequency preheat for filaments, nominal lamp-power control, and light-dimming capability.  Because the output inverter operates in resonant mode, you can control the power or current of these ballasts simply by varying the switching frequency.  To vary the frequency,  __ Circuit Design by Thierry Castagnet, SGS-Thomson Microelectronics, Schaumburg, IL

Handy tool troubleshoots feedback loop -  04/10/97 EDN Design Ideas:  One of the more difficult aspects of power-supply design is stabilizing the feedback control loop.  Practical shortcuts and empirical tips come in handy when you evaluate a supply’s stability or when you attempt to stabilize a supply that oscillates.  in such an attempt, it’s occasionally heLPFul to reduce the open-loop gain at frequencies from dc to the 0-dB feedback-loop crossover point to see if an oscillating loop becomes stable.  This technique increases the loop’s gain margin.    __ Circuit Design by Robert Buono, DRS Medical Systems, Mahwah, NJ

H-BRIDGE Theory & Practice -  A number of web sites talk about H-bridges, they are a topic of great discussion in robotics clubs and they are the bane of many robotics hobbyists.  I periodically chime in on discussions about them, and while not an expert by a long shot i've built a few over the years.  Further, they were one of my personal stumbling blocks when I was first getting into robotics[Chuck McManis] __ Designed by Chuck McManis

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 Dual DC/DC Converter Operates from 3.3V Input -  DN218 Design Notes__ Linear Technology/Analog Devices

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 Step-Down Controller Regulates to 0.6V Output from 3V Input -  DN322 Design Notes__ Linear Technology/Analog Devices

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 Efficiency 2-Phase Boost Converter Minimizes Input & Output Current Ripple -  DN371 Design Notes__ Linear Technology/Analog Devices

High Efficiency 42A DC/DC Converter -  DN225 Design Notes__ Linear Technology/Analog Devices

High Efficiency Isolated Flyback Supply Without Optoisolator -  DN1011 Design Notes__ Linear Technology/Analog Devices

High Efficiency Linear Regulators -  Linear Technology AN32 __ Designed by Jim Williams - Mar 1st, 1989

High Efficiency Monolithic Buck Converter [LTC1265] -  DN105 Design Notes__ Linear Technology/Analog Devices

High Efficiency Wide Input (Cold Crank) Range Dual 5V/8.5V Converter -  The LTC3859 is a high performance triple output (buck/ buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages.  Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 850kHz.  The LTC3859 operates from a wide 4.5V to 38V input supply range.  When biased from the output of the boost converter or another auxiliary supply, the LTC3859 can operate from an input supply as low as 2.5V after start-up as shown in this circuit, ideal for automotive "cold crank" applications that require a wide input voltage range.  __ Linear Technology/Analog Devices App Note, Jul 20th 2010

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 Impedance Buffer & Broadband Amplifier for Digital Freq. Meters -  With the introduction of synthesized transceivers employing the hetrodyning of several mixer crystals with the VCO output of a PLL system, there has grown the need to measure frequencies at low levels.  in the majority of cases, because we are dealing with solid state devices, we have levels that are around the order of 10 dBm or less (0 dBm = 1 mW).   __ Designed by First published Ralph Holland in the Wireless Institute of Australia Amateur Radio magazine, October 1980, last update 14 June 2003

High Performance 3-Phase Power Supply Delivers 65A & High Efficiency over the Entire Load Range -  DN312 Design Notes__ Linear Technology/Analog Devices

High Performance Frequency Compensation Gives DC-to-DC Converter 75µs Response with High Stability -  DN53 Design Notes__ Linear Technology/Analog Devices

High Power Synchronous Buck Converter Delivers Up to 50A -  DN156 Design Notes__ Linear Technology/Analog Devices

High Power Touch Switch Exciter Circuit -  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. . . Circuit by Dave Johnson P.E.-February, 2002

High Power Voltage Regulator has Low Dropout Voltage -  App Note #52__ Maxim Integrated

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

High Voltage Current Mode Step-Down Converter with Low Power Standby Capability -  DN383 Design Notes __ Linear Technology/Analog Devices

High Voltage Low Noise Buck Switching Regulator [LT1777] -  DN212 Design Notes__ Linear Technology/Analog Devices

High Voltage Solar Inverter DC-AC Kit -  Photovoltaic (PV) installations tied to the grid are usually built with arrays of modules connected in series to string inverters.  An emerging system architecture to harvest more energy per module by supplementing the conventional string inverter uses dc-dc converters dedicated to individual modules.  These systems, known as microconverters or dc-dc power optimizers address partial shading and other aging issues by implementing maximum power point tracking (MPPT) at the individual module level so that underperforming modules do not constrain the entire string __ Designed by Texas Instruments App Notes, 9-Jul-12

High Voltage, Low Noise, DC/DC Converters -  Linear Technology AN118 __ Designed by Jim Williams - Mar 28th, 2008

Highly Integrated High Efficiency DC/DC Conversion -  DN98 Design Notes__ Linear Technology/Analog Devices

High-Power Boost/SEPIC/Inverting DC/DC Converters with Fault Protection -  High-powered boost converters have historically suffered from the shortcoming that a DC path exists between the input and output nodes.  Fault conditions, such as output shorts, could easily damage or destroy key components in this path.  Other topologies, such as the SEPiC or inverting converters can also suffer from faults__ Linear Technology/Analog Devices App Note, Al Wu Nov 8th 2010

High-voltage Amplifier uses simplified -  14-Oct-04  EDN Design Ideas:  Many scientific instruments and sensors need ac high-voltage drive.  High-voltage drive is useful for driving electrodes in many applications.    __ Circuit Design by Jui-I Tsai, Jun-Ming Shieh, Tai-Shan Liao, and Ching-Cheng Teng, National Chiao Tung University, Taiwan

High-voltage, low-noise DC/DC converters -  08/07/08  EDN Technical Article: You can make a 1-kV dc/dc converter with only 100 µV of noise.   __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

How to Design a Simple Circuit Isolated Flyback Converter-LT3573 -  isolated power supplies are needed in a wide variety of applications.  Galvanic isolation is achieved by isolating two or more circuits using a transformer or optocoupler, and is desirable for many reasons: safety, noise immunity, circuit protection, etc.  Traditionally, isolated power supplies use an optocoupler to transfer__ Linear Technology/Analog Devices App Note, Mike Negrete-Design Engineer-Power Products Mar 15th 2009

How to use the Agilent N67xxA Modular Power System to replace an Agilent 662xA -  Application Note__ Aligent

HV flyback converter improves efficiency -  11/05/13  EDN Design Ideas:  This Design idea significantly improves conversion efficiency of externally driven flyback converter-based capacitor charging units intended for flash-lamp-pumped, pulsed solid-state laser sources.  in a flash-pumped pulsed solid state laser source, an energy storage capacitor is charged to a high voltage, dependant upon the amount of energy it is intended to deliver to the flash lamp when made to discharge.   __ Circuit Design by anil maini , Varsha Agrawal & Nakul Maini

IC & Capacitor Improve Isolated Supply -  09/01/97 EDN Design Ideas:   Many isolated power supplies typically use an optocoupler and a reference to provide feedback to a controller to maintain a constant output voltage.  Alternatively, you can use an isolated flyback regulator, iC1, to __ Circuit Design by Kurk Mathews, Linear Technology Corp, Milpitas, CA

ICL7660 DC to DC Converter from 5V to +/-5V -  The LTC1046 is a 50mA monolithic CMOS switched capacitor voltage converter.  it plugs in for the iCL7660/ LTC1044 in 5V applications where more output current is needed.  The device is optimized to provide high current capability for input voltages of 6V or less.  it trades off operating voltage to get higher output current.  The LTC1046 provides several voltage conversion functions: the input voltage can be inverted (VOUT = µViN) , divided (VOUT = ViN/2) or multiplied (VOUT = �nViN).  Designed to be pin-for-pin and functionally compatible with the iCL7660 and LTC1044, the LTC1046 provides 2.5 times the output drive capability.  __ 

Increasing Regulator Current -  An outboard pass transistor used to increase the current output of a voltage regulator iC.   __ Designed by Andy Collison

Inductor performance in high frequency DC-DC converters -  Coilcraft RF Magnetics App Note- __ Designed by Coilcraft Power Magnetics Application Note

Inductorless Switching Regulator Boosts Input Voltage -  App Note #5__ Maxim Integrated

Inductorless Voltage Converter Boosts a Single Lithium Cell -  App Note #1791__ Maxim Integrated

Industry’s First 4-Switch Buck/Boost Controller Achieves Highest Efficiency using a Single Inductor -  DN369 Design Notes__ Linear Technology/Analog Devices

Interfacing 5 Volt CMOS to 12 Volt loads -  The circuit above is designed to be used with the bi-directional lamp sequencer shown above on this same page.  Two additional transistors are used to increase the current from the 74HCT138 decoder to control 12 volt 25 watt lamps.  A 6.8 volt/1 watt zener diode is used in series with the ground connection of all the CMOS ICs (74HC14, CD4516 and 74HC138s) so that the total voltage across the CMOS devices will be about 5.2 volts and the outputs will move from +12 to about +7 when selected.  The 2N2905/PNP transistor stage is connected as an emitter follower which provides a high impedance to the __ Designed by Bill Bowden

Inverter forms high-efficiency rail-splitter -  08/01/97 EDN Design Ideas:  in Figure 1, a switched-capacitor voltage inverter, iC1, configured as a "rail-splitter, " provide as a bipolar, dual-rail power supply.  The circuit is useful in single-supply systems that include one ordual-supply iCs.  The SOT-23 package and associated components require little board area __ Circuit Design by Terry Millward, Maxim Integrated Products, Reading, UK

Inverter offers Design flexibility -  06/05/00 EDN Design Ideas:  You may occasionally need a substitute for a commercial dc/ac inverter.  A typical application is in an uninterruptible power supply (UPS].  The circuit in Figure 1 is a flexible, low-component-count inverter with closed-loop.   PDF contains many designs, scroll to find this one.   [Nihal Kukaratna, Arthur C Clarke institute, Katubedda Moratuwa, Sri Lanka] __ Circuit Design by Nihal Kukaratna, Arthur C Clarke Institute, Katubedda Moratuwa, Sri Lanka

IRDCiP1202-A 300kHz Dual 15A 5.5VIN to 13.2VIN Dual Output Synchronous Buck Converter using iP1202 -  This board allows engineers to easily evaluate the iP1202 in an independent and parallel configuration that is capable of providing up to 15A per phase with double-sided heat sinking.  __ 

IRDCiP2001-A 500kHz 40A 2-phase Synchronous Buck Converter using iP2001 -  This board enables engineers to easily evaluate the iP2001 in a 2-phase configuration that is capable of providing up to 40A in a lab environment without airflow.  __ 

Isolated Converters Have Buck Simplicity & Performance -  DN377 Design Notes__ Linear Technology/Analog Devices

Isolated DC/DC Conversion with the LT1425 -  DN158 Design Notes__ Linear Technology/Analog Devices

Isolated Flyback Controller with PFC Controls Voltage or Current -  Linear Technology’s LT®3798 isolated controller with active power factor correction (PFC) is specifically designed for regulating bus voltages or driving constant current applications over a wide input range of 10V to 480V.  it is ideal for constant voltage/current applications requiring 4W to over 100W power.  The LT3798’s__ Linear Technology/Analog Devices App Note, Jesus Rosales-Applications Engineer Oct 27th 2011

Isolated Flyback Converter Regulates Without an Optocoupler -  DN260 Design Notes__ Linear Technology/Analog Devices

Isolated Signal Trims DC/DC Converter -  09/01/95 EDN Design Ideas:  Adding a single resistor and optoisolator to the standard dc/dc converter trim in Fig 1a results in an isolated trim configuration (Fig 1b).  in Fig 1a, VOUT equals VTRiMxVNOM/2.5V.  in this example, VNOM is 15V, and VTRiM is 0 to 2.5V.  This configuration is acceptable for most applications, except those in which the trim signal must be totally isolated from the converter.  For Fig 1b, many types of analog optoisolators are available, but the VTL2C2 provide as the necessary characteristics.   __ Circuit Design by Dennis Eichenberg, Parma Heights, OH

Isolated Supply Powers DVM Module -  02/07/08  EDN Design Ideas:  A simple, low-cost, isolated flyback power supply energizes a DVM module __ Circuit Design by Richard Dunipace, Fairchild Semiconductor, Irving, TX

Isolated T1 current loop to voltage power supplies -  Designed to operate on a standard 60 mA current loop circuit (T1 current loop) this power supply provides an isolated and regulated 5 VDC at 140 mA. __ Designed by Steve Hageman

Isolated telecomm converter handles 25W -  09/01/97 EDN Design Ideas:  Telecomm applications in the central office require an isolated5V supply derived from ­48V, this gives out5V at5A from an input voltage of ­36 to ­72V __ Circuit Design by Ron Young, Maxim Integrated Products, Sunnyvale, CA

Isolated-12 Watt, OEM DC/DC converter (with Telecom input voltage range) -  12 Watt, Single output, isolated, Modular power supply designed for flexible OEM manufacturing.  The supply may be built for +2.5 to +15 volt outputs with inputs of 9-18, 18-36 or 36-72 VDC. __ Designed by Steve Hageman

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