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Power Supplies:  DC to DC / Switch Mode and DC to DC Converters
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Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

Caps Provide Voltage Boost to Series Regulator - This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply. . . Circuit by David Johnson P.E.-January, 1998

 Charge Pump Battery Charger-+5 Volts - The circuit below will trickle charge a four cell pack of AA or AAA NiMH
batteries.  The circuit draws current from the +5v available a USB connection and pumps about 70ma of current into the battery.  This should be enough current to fully charge a pack of . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2010

 Charge Pump Efficiently Divides Supply Voltage  - This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value. . . Circuit by Dave Johnson P.E.-July, 2000

 Classic Linear 5v 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. . . Circuit by David Johnson P.E.-February, 2009

 CMOS Inverter 125khz LC Oscillator - This circuit uses a single CMOS inverter to form a series resonant LC oscillator.  The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values. . . Circuit by Dave Johnson P.E.-March, 2002

 CMOS Inverter forms a Resonant LD Oscillator  - This circuit uses a single CMOS inverter to form a series resonant LC oscillator.  The values shown set the oscillation at about 125KHz but the other frequencies are possible by changing the main LC values . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2002

 CMOS Inverters Form 125Khz Oscillator - This circuit inverts the LC components so the inductor is grounded.  Two inverters are needed to produce the needed oscillation.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002

 CMOS Nand Gate Forms Gated 125Khz Oscillator - This circuit is uses a NAND gate as an inverter.  The gate allows the oscillator to be gated on and off.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies. . . Circuit by David A. Johnson P.E.-March, 2002


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

Calibration, compensation & correlation -  Coilcraft RF Magnetics App Note- __ Designed by Coilcraft Power Magnetics Application Note

Capacitor Charger Improves High-Voltage Supply -  12/19/96 EDN Design Ideas:  The supply in Fig I meets the high-voltage requirements of pulsed networks, ignition systems, and flashlamps.  You commonly use flyback circuits to provide low-power, high voltages.  in a flyback circuit, a transformer stores energy when the main switch is on, and that energy transfers into the load when the switch opens.  Constant-frequency __ Circuit Design by Kurk Mathews and Jesus Rosales, Linear Technology Corp, Milpitas, CA

Capacitor improves efficiency in CPU supply -  04/04/02 EDN Design Ideas:  High efficiency is important for the DC/DC buck converters that supply high currents in notebook PCs.  This efficiency extends battery life and minimizes temperature rise.  A low-dissipation synchronous rectifier using an external MOSET provide as this high efficiency.  Synchronous rectifiers require special attention, however __ Circuit Design by Masami Muranaka, Maxim Integrated Products, Tokyo, Japan

Caps Provide Voltage Boost to Series Regulator -  This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  it can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply. . . Circuit by David Johnson P.E.-January, 1998

Cascaded converter boosts LED-drive capability -  08/16/07 EDN Design Ideas:  A two-stage boost converter can drive a string of 20 to 30 LEDs __ Circuit Design by Grant Smith, National Semiconductor, Phoenix, AZ

Cascode MOSFET increases boost regulator's input- & output-voltage ranges -  09/01/05 EDN Design Ideas:  Simple enhancement extends range of both side as of regulator __ Circuit Design by Scot Lester, Texas Instruments, Dallas, TX

Charge Pump & Step Up DC DC Converter Solutions for Powering White LEDs in Series or Parallel Connections -  App Note #1037__ Maxim Integrated

Charge Pump 12V to 5V Supply -  The LTC3260 can supply up to 100mA from the inverted input voltage at its charge pump output, VOUT.  VOUT also serves as the input supply to a negative LDO regulator, LDO.  The charge pump frequency can be adjusted between 50kHz to 500kHz by a single external resistor.  The MODE pin is used to select between a high efficiency__ Linear Technology/Analog Devices App Note, Jan 4th 2013

Charge Pump Battery Charger-+5 Volts -  The circuit below will trickle charge a four cell pack of AA or AAA NiMH
batteries.  The circuit draws current from the +5v available a USB connection and pumps about 70ma of current into the battery.  This should be enough current to fully charge a pack of . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2010

Charge pump converts 5V to 5V -  01/20/05  EDN Design Ideas:  Versatile switched-capacitor charge-pump voltage converters can provide a negative supply voltage from a positive-voltage source or double a positive source's voltage.  However, certain applications that consist entirely of ECL (emit __ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Charge pump converts V IN to V OUT -  02-Sep-99 EDN Design Ideas:  A charge-pump iC's ability to produce both ViN  and -ViN outputs allows the circuit in Figure 1 to generate separate positive and negative outputs from a single input voltage, regardless of the input-voltage polarity.  For example, the circuit allows an RS-232C interface __ Circuit Design by Ioan Ciasci, Rei Data, Cluj-Napoca, Romania

Charge Pump Doubles Negative Voltage -  App Note #782__ Maxim Integrated

Charge Pump Efficiently Divides Supply Voltage  -  This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value. . . Circuit by Dave Johnson P.E.-July, 2000

Charge Pump Generates Positive Bias -  03/02/95 EDN Design Ideas:  Placing the averaging filter inductor in the output return leg of an isolated forward-converter power supply can significantly reduce the common-mode noise the supply generates.  This technique can eliminate some of the high-frequency spikes present on the output voltage __ Circuit Design by Steve Mowry, Siemens Industrial Automation, Johnson City, TN

Charge Pump Voltage Quadrupler -  Simple circuit that will quadruple an input voltage.  Useful for bias supplies and programming voltages.  __ 

Charge pump with ultraLow quiescent current -  08/05/04  EDN Design Ideas:  Portable battery-powered devices often spend most of their life in standby mode, in which the quiescent current of an internal boost converter continuously bleeds the battery.  The quiescent current during standby can be larger than  __ Circuit Design by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA

Charge pump-logic voltages of 3-5 volts. -  A charge pump uses arrays of capacitors to increase voltage in a circuit.  in this way, you can drive higher voltage loads from logic voltages of 3 - 5 volts.   __ Designed by Bruce Robinson

Charge-pump divides by two -  02/18/99 EDN Design Ideas:  NOTE:  Collection of Design ideas, scroll to find this one.   Small size and efficiency approaching 100% make switched-capacitor charge pumps popular for voltage doubling and inverting in miniature dc-dc applications.  Few are aware, however, that most charge pumps can halve as well as double or invert an input voltage.  The increasing adoption of low-voltage logic makes this 2 capability useful for generating low-voltage supplies in portable equipment.   __ Circuit Design by Budge Ing, Maxim Integrated Products, Sunnyvale, CA

Charge-pump topology doubles voltage, breaks DC path -  EDN Design Ideas:  08/09/2016    This unusual charge-pump voltage multiplier Design ideas - not only doubles the input, but has a pseudo-floating output __ Circuit Design by Michael Dunn

Charger for Gel Lead Acid Batteries -  This high-performance circuit first quickly starts (Tony van Roon's and holds) the charge at 2 amp, but as the voltage rises the current will consequently decrease.  When the current falls below 150mA, the charger automatically switches to a lower 'Float' voltage to prevent overcharging.  At the point that a full charge is reached, Q1 will bias and the LED will light.   __ Designed by Tony van Roon  VA3AVR

Charging & Discharging a Capacitor -  in order to better understand the action of a capacitor in conjunction with other components, the charge and discharge actions of a purely capacitive circuit are analyzed first.  For ease of explanation the capacitor and voltage source shown in figure 3-6 are assumed to be perfect (no internal resistance) , although this is impossible in practice.  __ 

Cheap PWM IC makes synchronous gate driver -  02/04/99 EDN Design Ideas:  NOTE:    Page includes several designs.  Scroll to find this one.  A system with a P, memory, and peripherals usually requires several power-supply voltages.  Designers typically use local switching regulators to produce the desired voltage rails.  One of the most common topologies, the synchronous buck regulator, converts a 5 or 12V bus to some other, lower voltage.  This approach has gained vast acceptance, thanks to its relative simplicity __ Circuit Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Choosing the Right Power Supply IC for Your Application -  App Note #737__ Maxim Integrated

Circuit Biases VCOS for Cable andTV -  11/20/97 EDN Design Ideas:  PLLs are useful in a variety of applications, most notably cable and TV tuners. __ Circuit Design by Ravindra Ambatipudi, National Semiconductor Corp, Santa Clara, CA

Circuit Boosts Voltage to Piezoelectric Transducers -  06/09/11  EDN Design Ideas:  Drive a piezo device at maximum power and its resonant frequency.  Piezoelectric transducers are common in ultrasonic and acoustic-alarm-signaling applications.  To get enough acoustic power from a piezoelectric transducer, you must power the device with a frequency at or near its resonant frequency.  Furthermore, the driving voltage should be as high as the transducer allows.   __ Circuit Design by Kurt Nell, Sankt Plten, Austria

Circuit breaker handles voltages to 32V -  25-May-00 EDN Design Ideas:  The simplicity of low-side current monitoring can mask the advantages of a high-side approach.  You can monitor load currents in a power supply, a motor driver, or another power circuit on either the high or the low side (ground].  However, don't let the ease of low-side monitoring cause you to overlook __ Circuit Design by Greg Sutterlin and Craig Gestler, Maxim Integrated Products, Sunnyvale, CA

Circuit Breaker Provides Overcurrent & Precise Overvoltage Protection -  7-Jun-07 EDN Design Ideas:  A simple circuit breaker delivers precision overvoltage protection and overcurrent protection __ Circuit Design by Anthony H Smith, Scitech, Bedfordshire, England

Circuit converts 5V to 10V -  26-May-05 EDN Design Ideas:  Switched-capacitor circuit doubles, inverts dc source __ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Circuit Drives 9V Solenoids From 3V Battery -  08/17/95 EDN Design Ideas:  At times, it may be necessary to power a solenoid-type pulsed actuator from a low-voltage battery in portable equipment.  The circuit in Fig 1 accomplishes this task using a standby current of 10 A.  The design takes advantage of the fact that solenoids like being actuated by capacitive discharge at much higher levels than their nominal voltage.  This mode of operation results in a good, crisp response by the solenoid plunger.    __ Circuit Design by Craig Varga, Linear Technology Corp, Milpitas, CA

Circuit forms simple, low-cost, 1-kV driver -  13-May-04 EDN Design Ideas:  High-voltage drivers have recently received much attention, because they play an important role in driving piezoelectric and electro-optical components, for example.  Figure 1 shows a simple, low-cost, 1-kV driver.  The circuit uses offline, current-mode-control techniques and a flyback switching-power-supply design __ Circuit Design by Tai-Shan Liao and Prasit Champa, National Science Council, Hsinchu, Taiwan

Circuit Multiplexes Automotive Sensors -  01/20/00 EDN Design Ideas:  Often, aC limits the number of input-capture lines to accommodate the various types of automotive sensors with pulsed outputs, such as vehicle- and engine-speed sensors.  The circuit in Figure 1 uses discrete components to multiplex two sensors with open-collector outputs into a single output, thereby sharing one input-capture line of the C.  The C selects the sensor whose output you will measure.    __ Circuit Design by Adil Ansari

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