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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 09, 2017 03:39 PM

Circuits Designed by Dave Johnson, P.E. :

Medium Power 125khz Oscillator - This circuit adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz. . . Circuit by Dave Johnson P.E.-March, 2002

 Medium Power 125khz Oscillator #2 - 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.. . . Circuit by David A. Johnson P.E.-March, 2002

 Micro Power Over-Temperature Alarm - The circuit is powered for years by a single 3 volt lithium battery.  It sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a. . . Circuit by David Johnson P.E.-June, 2000

 Negative 0.5 Volt Supply - This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

 Over-Temperature Micro-Power Alarm - The circuit is powered for years by a single 3 volt lithium battery.  It sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

 Peak to Peak 300v Signal Generator - This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

 RS-232 Serial Interface Status Indicator Circuit - I designed this circuit many years ago and have used it several times since.  It uses a single logic IC to indicate the TXD and RXD line activity of a typical RS-232 serial data communications link.  The thresholds are set at plus 3 volts and minus 3 volts.  Two dual color LEDs are used as indicator lights . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2007


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

Obtain a lower DC voltage from a higher voltage power supply -  06/08/06 EDN Design Ideas:  Linear stepdown regulator saves watts __ Circuit Design by Luca Bruno

OEM, 2 Watt, DIP DC/DC converter -  2 Watt, Dual output, isolated Modular power supply designed for flexible OEM manufacturing.  The supply may be built for +/-5 to +/-15 volt outputs with inputs of 10-20, 18-36 or 36-72 VDC.   __ Designed by Steve Hageman

OEM, 20 watt SIP DC/DC converter -  This DC/DC converter was designed for a flexible OEM manufacturing line.  The outputs can be set to 1.8 to 5 volts and the input voltage range can range from Vout to 16 VDC.  This 20 watt, non-isolated design runs at 220 kHz and produces efficiencies up to 96%.   __ Designed by Steve Hageman

Off-Hook Phone Line Supplies 150 m -  09/01/94 EDN Design Ideas:  For systems that require 150 mW or less, the power supply in Fig 1 draws power from ordinary phone jacks without interrupting the voice signal, thereby eliminating the need for batteries and ac adapters.  Built into peripheral equipment such as PCMCiA modem cards, this circuit can spare the battery in a host computer.  The circuit is __ Circuit Design by Ron Clark and Bob Underwood, Maxim Integrated Products, Sunnyvale, CA

Off-Line 12 Volt SMPS Power Supply -  This is a simple low-cost 50W off-line switching power supply, which can be used for home projects or to learn operation of flyback converters.  it can work over a universal AC line input range 90-264 VAC and provides a 12VDC output at more than 4A load.  Line and load regulation is better than 0.  5%. (added 11/07)  __ Designed by Lazar Rozenblat

Off-Line Buck Regulator Cuts Costs, Lead-Time -  10/26/95 EDN Design Ideas:  The low-cost, frequency-modulating buck regulator in Fig 1 uses an inexpensive CMOS iCM7555 timer and a low-cost, low-power rail-to-rail op amp.  Because of the low power of these parts, the circuit can achieve efficiencies of more than 90%.  Although you can combine many controllers with a high-side switch to achieve the same function, this circuit is cheap.  Also, you can quickly build it from easily available parts. __ Circuit Design by Peter McAnn, Trek Inc, Medina, NY

Off-Line Power Supply Requires Few Part -  02/17/94 EDN Design Ideas:  This simple non-isolated off-line power supply can provide up to150 mA5V and uses only a handful of components from110-230-Volt AC input voltage.  Note that the low voltage output is directly connected to the mains; it cannot be used when the low voltage part can be touched __ Circuit Design by Sam Ochi, IXYS Corp, Santa Clara, CA

One 9 Volt Battery gives +18 +25 +33V -  This circuit is based on MAX1044 is a charge pump converter __ Designed by R.G. Keen

One Cell Flashes White LED -  12/11/03 EDN Design Ideas:  Many portable appliances and other products that must operate from a single cell are restricted to working at very low voltages.  it is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5V.  The ability __ Circuit Design by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK

One cell lights any LED -  07/05/01  EDN Design Ideas:  The circuit in Figure 1 allows you to light any type of LED from a single cell whose voltage ranges from 1 to 1.5V.  This range accommodates alkaline, carbon-zinc, NiCd, or NiMH single cells.  The circuit's principal application is i __ Circuit Design by Al Dutcher, Al Labs, West Deptford, NJ

One IC Biases LCD & GaAsFET Amplifier -  04/09/98 EDN Design Ideas:  (File , contains several circuits, scroll to this one) Operating from a lithium-ion cell or a four-cell NiCd battery, the circuit in Figure 1  provide as 6V bias for LCDs and a separate, quiet negative bias for a GaAsFET power amplifier.  This bias combination exists in cell phones __ Circuit Design by John Wettroth, Maxim Integrated Products, Apex, NC

One resistor improves V2 converter -  08/15/97 EDN Design Ideas:    Step-down switching regulators commonly provide myriad digital-circuit voltages that range from traditional logic voltages of 5 and 3.3V to processor-core voltages of 1.8V and below.  The main advantage of these regulators __ Circuit Design by Dimitry Goder, Switch Power Inc, San Jose, CA

One Transistor Provides Short-Circuit Protection -  10/16/03  EDN Design Ideas:  in certain DC/DC-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit.  A nonsynchronous boost converter provide as a direct path from the input to th __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

One-transistor FM Transmitter -  A truly minimalist circuit.  Performance is relatively poor and stability is a problem.  Q1 modulates the signal and acts as an oscillator.  L1 and C5 determine the frequency.  Decrease C5 for a higher frequency and vice-versa.  __ 

Open-loop power supply Delivers as much as 1W -  01/18/01 EDN Design Ideas:  For VCRs, TVs, and other equipment that requires a standby mode, you must supply power to a µP when other components are asleep to receive and interpret any wake-up signal from the remote control or from the broadcasting company.  These types __ Circuit Design by Christophe Basso, On Semiconductor, Toulouse, Cedex, France

Optimized DC/DC Converter Loop Compensation Minimizes #of Large Output Capacitors -  DN186 Design Notes__ Linear Technology/Analog Devices

Optimizing a DC/DC Converter’s Output Capacitors with the LTC1435A -  DN198 Design Notes__ Linear Technology/Analog Devices

Optimizing Bluetooth Device Battery Drain Measurements in Manufacturing -  Application Note__ Aligent

OTP µC controls Boomer Amplifier -  03/18/99 EDN Design Ideas:  NOTE:     Page includes several designs.  Scroll to find this one.  Figure 1 shows a circuit that uses a one-time-programmable (OTP) µC in an unusual way.  A COP8SGR7 µC uses digital signals to "bit-bang" an LM4835 (dubbed "Boomer" by National) amplifier.  Although the amplifier is designed for potentiometer control, you can modify it to make it a fully digitally controlled part.  Figure 2 shows the flow chart for the control process.   __ Circuit Design by Wallace Ly, National Semiconductor Corp, Santa Clara, CA

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

Overall Noise Figure of Two Stage Amplifier -  Application Note__ MiniCircuits.com

Over-Temperature Micro-Power Alarm -  The circuit is powered for years by a single 3 volt lithium battery.  it sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Pass Transistor Lowers Dropout Voltage -  02/18/99 EDN Design Ideas:  NOTE:  File contains several circuits, please scroll to this this one.   With linear regulators, you measure dropout voltage, ViN–VOUT, at the minimum input voltage for which the IC sustains regulation.  Low dropout means longer battery life, because the load circuit continues to operate while the battery discharges to a lower terminal voltage __ Circuit Design by Matt Schindler, Maxim Integrated Products, Sunnyvale, CA

PFM Control Improves Dual-Output Converter -  09/28/06 EDN Design Ideas:  Upgrade an RGB video system without adding cables __ Circuit Design by Werner Schwiering, Joystick Scoring Ltd, Whitby, ON, Canada

Photo Flash Charger Minimizes Parts Count -  10/22/98 EDN Design Ideas:   Photo-flash and strobe devices operate by discharging a high-voltage capacitor into a bulb.  Charging the capacitor from a battery or other low-voltage source requires a step-up DC/DC converter to boost the voltage, typically to 300V.  One way to generate the high voltage __ Circuit Design by Steven Chenetz, Micrel Semiconductor, San Jose, CA

Piezoelectric Energy Harvester & 1.2V Secondary Rail -  The LTC3388-1/LTC3388-3 are high efficiency step-down DC/DC converters with internal high side and synchronous power switches that draw only 720nA typical DC supply current at no load while maintaining output voltage regulation.  The EN pin can be used to activate the LTC3388-1/LTC3388-3.  For instance, in this circuit the __ Linear Technology/Analog Devices App Note, Jul 23, 2010

Peak to Peak 300v Signal Generator -  This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

PolyPhase™ DC/DC Converter Delivers High Current -  DN234 Design Notes__ Linear Technology/Analog Devices

Positive regulator makes dual negative-output converter -  06/26/03  EDN Design Ideas:  Some systems, such as optical networks, require than one negative voltage.  A common procedure is to boost the main negative supply of -5V to -10V and then reduce it with a linear regulator to -9V.  The -5V itself comes from a positiv __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Positive regulator makes negative DC/DC converter -  12/26/02 EDN Design Ideas:  Power-supply designers can choose from a plethora of available positive buck regulators that can also serve as negative boost DC/DC converters.  Some buck regulators have a negative-feedback reference voltage expressly for this purpose, but ICs that have positive-reference feedback voltages far outnumber these negative-feedback regulators __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Power Supply -  Circuit provides +5VDC regulated, +10VDC unregulated and 7.  5VAC.   __ Designed by Wichit Sirichote

Power Supply (psu 1) -  One of the most useful circuits for the home constructor is the Power Supply Unit.  A transformer with tapped secondaries can give a range of output voltages for testing and operating home-made equipment. __ Designed by Harry Lythall-SM0VPO

Power Supply Accepts Wide Input-Voltage Range -  02/17/11  EDN Design Ideas:  A SEPiC-based power supply runs from 1.5V to 20V.  The switching power supply in Figure 1 produces 3.3 V dc from an input voltage of 2.5 to 20V dc with high efficiency.  The circuit operates at an input voltage as low as 1.5V once it starts from a minimum of 2.5V dc, allowing the switcher to fully discharge a pair of alkaline cell batteries nearing end of life.  The power supply can also run efficiently off higher input voltages, such as 12V automotive power.  The heart of the circuit is a SEPiC (single-ended-primary-inductance-converter) -based switching power supply, which provide as an output voltage greater than or less than the input voltage (Reference 1).   __ Circuit Design by Jim Windgassen, Northrop Grumman Undersea Systems, Annapolis, MD

Power Supply Converted from a PC link -  This ATX PS board has leads for +5 (RED) , -5 (WHiTE) , +12 (YELLOW) , -12 (BLUE) volts, Ground (BLACK) and switch (GREEN).  Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes.  The fan has also been unplugged for better viewing.  Since this PS was converted for use in the logic and robotics labs, the selected voltages  __ Designed by Andy Batts

Power Supply Fits Into Small Spaces -  11/13/03 EDN Design Ideas:  The demand for negative-voltage power supplies is increasing with the popularity of applications for portable devices.  it can be expensive and relatively complicated to generate a negative supply from a positive input source, especially when the design requires both positive and negative outputs __ Circuit Design by Raymond Zheng, Linear Technology, Milpitas, CA

Power Supply Provides +5VDC Regulated, +10VDC Unregulated & 7.5VAC -  Build a simple DC supply having three output terminals: regulated +5VDC, unregulated +10VDC and 7.  5VAC.  The supply is suitable for microcontroller experimenting.   __ Designed by Wichit Sirichote

Power Supply Runs off Battery or Wall Adapter -  06/18/98 EDN Design Ideas:  Most portable products need to operate from both a battery and an external wall adapter.  Although conceptually simple, implementing a robust and bulletproof design that properly switches between these two power sources can be challenging.  The circuitFile contains several circuits, scroll to find this one __ Circuit Design by David Bell, Linear Technology Corp, Milpitas, CA

Power Supply Transient Protection for MNA & VNA Amplifiers -  AN-60-027 Application Note__ MiniCircuits.com

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