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Power Supplies:  Switch Mode
Switchmode Power Supply:  #'s -F         G - R         S - Z
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Last Updated: December 31, 2017 06:44 AM

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

Simple Circuit Switching Power Supply (karl lunt)-  I built a PCB for a simple switching power supply, originally designed by Keith Payea of the SRS.  It uses an LM393, a P-channel power MOSFET, and darn little else.  Since its frequency varies based on load (and nearly everything else imaginable) , you can use junk-box parts and build it for cheap__

Single FET Controls 2nd LED Array in Switchmode LED Backlight-  APP1871: Feb03, 2003 A design in which the display is backlit (or frontlit) for extended periods needs an efficient circuit that drives the LEDs with a controlled current, and eliminates the wasted power associated with current-limiting resistors.  A switch-mode boost design that regulates current instead of voltage accomplishes this purpose. __ Maxim Integrated

Single IC Five Output Switching Power Supply System for Portable Electronics-  DN150 Design Notes__ Linear Technology/Analog Devices

Single Inductor Tiny Buck/Boost Converter Provides 95% Efficiency in Lithium-Ion to 3.3V Applications-  DN275 Design Notes__ Linear Technology/Analog Devices

SMPS Basics-The Buck Converter-  (spice design) __ Designed by Rick 

SMPS Power Loss-  (spice design) __ Designed by Rick 

SPICE Predicts Differential Conducted EMI from Switching Power Supplies-  02/03/97 EDN-Design Feature  Spice not only can predict the exact EMI levels produced by a switched-mode power supply, but also can produce plots that allow you to easily evaluate your design and the effectiveness of the EMI filter. __ Circuit Design by Christophe Basso, Sinard, France

Spreadsheet simplifies switch-mode power-supply flyback-transformer Design-  EDN  Design Ideas - 03/14/1997  Designing flyback transformers for switch-mode power supplies involves many calculations.  A spreadsheet can make short work of this otherwise-tedious task. __ Circuit Design by Brooks Leman, Power Integrations

Starpower-A Switching Supply for Luxeon Star LEDs-  It's based on a switching regulator ic, runs of 12V and is just the shot for powering 1-5W Luxeon Star LEDs.__ SiliconChip

Step Down Switching Regulators-  Linear Technology AN35 __ Designed by Jim Williams - Aug 1st, 1989

Step up/step-down current-source charges batteries-  06/06/96  EDN Design Ideas:  For battery charging, the highly efficient step-down (buck] configuration is usually the topology of choice.  However, a different approach is necessary if the following conditions prevail. The supply voltage is less than the battery __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Step-Down Converter Operates from Single Li-ION Cell-  DN196 Design Notes__ Linear Technology/Analog Devices

Switch Mode DC Supply-  The switching power supply, shown in the schematic, provides12 volts, at10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit.  The supply was constructed in1984 and is variable frequency, as opposed to the pulse width modulator (PWM) controllers used today __ Designed by Michael Ellis

Switch Mode Power Supply +5V-  (LM2671, LM2674) This Switch Mode Power Supply circuit use the IC from National Semiconductor has been producing and designing ICs for use in switch-mode power supplies for many years.  The application of these devices is normally straightforward, helped by the__

Switched Mode Regulator-  There are numerous switchmode regulators available, most based on ICs.  While convenient (if you can get the IC) , they are not always readily available, and like all ICs, exclude the user from understanding their operation for the most part.  This appnote is based on AN-003 - a constant current version of an otherwise almost identical circuit. __ Designed by Rod Elliott  ESP

Switched-Capacitor IC & Reference Form Elegant –48 to +10V Converter-  04/24/03  EDN Design Ideas:  A system designer must almost always face a trade-off in choosing the right part for an application.  The trade-off usually involves performance, price, and function.  An example is the issue of powering circuits from a telecom-voltage source.  Telecom systems almost exclusively use high-potential negative rails, such as -48V __ Circuit Design by Wallace Ly, National Semiconductor, Santa Clara, CA

Switched-Capacitor Voltage Multiplier Achieves 95% Efficiency-  06/10/10 EDN Design Ideas:  Linear voltage regulators become inefficient when the input voltage is much higher than the regulated output.  The circuit in Figure 1 dramatically increases efficiency when the input voltage is more than twice the desired output; for example, using 12V to obtain a regulated 3.3 or 5VPDF contains multiple circuits scroll to find this circuit __ Circuit Design by Jeff Witt, Linear Technology Corp, Milpitas, CA

Switched-Gain Op Amp Serves as Phase Detector or Mixer-  05/01/08  EDN Design Ideas:  By switching the disable input of an op amp at a reference frequency and lowpass-filtering its output, you can obtain a dc voltage proportional to the phase difference __ Circuit Design by W Bruce Warren, Marietta, GA

Switcher adds programmable-PWM-duty-cycle clamp-  09/27/07 EDN Design Ideas:  A simple circuit adds a programmable duty-cycle clamp to an inexpensive, eight-pin PWM power-supply controller __ Circuit Design by Michael O’Loughlin, Texas Instruments, Nashua, NH

Switcher IC hikes Battery Charger's Efficiency-  06/23/94 EDN Design Ideas:  The adjustable switching-regulator LM2575T-ADJ, IC1, in Fig 1 replaces a power-wasting pnp transistor in the data-book design for the NiCd battery charger IC2, a MAX713. (Its sister device, the MAX712, handles NiMH
cells. ]IC2 "fast-charges" cells by monitoring the cell's voltage and charging current __ Circuit Design by Huw Jones, Gyrus Medical Ltd, Cardiff, Wales, UK

Switching Converter Uses Planar Magnetic-  11/07/96 EDN Design Ideas:  Planar-magnetics technology is growing in popularity as a design option for dc-dc converters.  In addition to providing electrical benefits, planar magnetics offers reduced leakage inductance and improved consistency.  It also significantly reduces the cost of magnetics if you integrate it into the printed-circuit board.  To use planar magnetics in a dc-dc converter, __ Circuit Design by Andrew Cowell, Temic/Siliconix, Santa Clara, CA

Switching regulator 2-  I introduce the switching regulator which used MC34063A of the MOTOROLA, Inc.  in this page.  This regulator is housed in the DIP (Dual In line Packge) with 8 pins.  The 1.5-A output current can be gotten without the heatsink in spite of this size.  The input voltage can be used from 3 V to 40 V and can do the function of the Step Up (making the output voltage which is higher than the input voltage) , the Step Down (making the output voltage which is lower than the input voltage) and moreover Inverting __ Designed by Seiichi Inoue

Switching regulator forms constant-current source-  05/30/02 EDN Design Ideas:  Many applications require current sources rather than voltage sources.  When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor.  To solve the wasted-power problem, you can use a switch-mode regulator.  The circuit of Figure 1 uses IC1, an LM2576 adjustable regulator __ Circuit Design by Stefan Strozecki, Institute of Telecommunications, bydgoszcz, Poland

Switching Regulator Output goes BeLow VREF-  03/17/94 EDN Design Ideas:  The feedback arrangement of typical switching regulators doesn't allow the regulated outputs to go lower than the reference voltage.  If you try to lower the output by modifying the feedback network, the compensation components the manufacturer recommends may no longer stabilize the regulator's error amplifier __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Switching regulator reduces Motor brake's power consumption-  01/04/07  EDN Design Ideas:  Inexpensive IC replaces relays and power resistsor __ Circuit Design by Alain Minoz, Elekta Instrument AB, Stockholm, Sweden

Switching Supply 12 Volt Strobe-  A HIGH POWER STROBE, suitable for many applications. __ Designed by G.L. Chemelec

Switchmode Car Power Supply-  Low power +/-12V supply for car preamps and equalisers (etc) __ Designed by Rod Elliott  ESP

Switchmode Constant Current Source-  Operating a stepper motor using a fixed (constant) voltage supply results in poor torque at high speeds.  In fact, stepper motors tend to stall at fairly low speeds under such conditions.  Several approaches can be used to overcome this problem, one of which is to use a constant current supply in place of the more__

Switchmode converter 70W input:10-16VDC Output:200-300VDC-  Simple Switch mode up-converter is normaly called inverters. Input voltage 10-16 Volt, Output 200-300 Volt DC 70 W.  Uses UC1825 from Unitrode, and two IRF540 to drive the push-pull transformer. __ Designed by Thomas Scherrer OZ2CPU

Switchmode converter 800W & Audio Amp.-  The converter uses an UC1825 from Unitrode, this IC drives two HUGE and powerfull MOS-FETS IRFP150.  Input voltage 11 to 16 volt, input current max load 70 A.  Output voltages +30 and -30 balanced __ Designed by Thomas Scherrer OZ2CPU

Switchmode Power Amp Supply-  A high power (350W typical) car power amplifier supply __ Designed by Rod Elliott  ESP

Switchmode PSU Protection-  This contributed circuit can help prevent failure of your switching power supply. __ Designed by Rod Elliott  ESP

Synchronous Buck/Boost High Power White LED Driver-  LT3453__ Linear Technology/Analog Devices

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

Telephone Ring Generator using Switching Power Supply-  The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high voltage, 1 amp transistor) and a driver transistor (2N3053).  The inductor should have a low DC resistance of 1.5 ohms or less.  The switching supply must have a load connected to prevent the voltage from rising too high, so a 22K resistor is __ Designed by Bill Bowden

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 watt switching power supply-  In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor.  Energy is stored in the inductor while the transistor is on, and released into the load circuit when the transistor switches off.  The output voltage is dependent on the load resistance and is limited by a zener diode that stops the oscillator when the voltage reaches about 14 volts.  Higher or lower voltages can be obtained by adjusting the voltage divider that feeds the zener diode.  The efficiency is about 80% using a high Q inductor. __ Designed by Bill Bowden

UltraLow Noise Switching Power Supplies Simplify EMI Compliance-  DN316 Design Notes__ Linear Technology/Analog Devices

Use a 555 timer as a switch-mode power supply-  14-Nov-02 EDN Design Ideas:  Most switch-mode power supplies rely on a PWM (pulse-width-modulated] output that is controlled via voltage feedback.  A 555-timer IC can inexpensively perform PWM.  The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply with only one simple equation.  The design uses two 555s __ Circuit Design by Aaron Lager, Masterwork Electronics, Rohnert Park, CA

Use a microcontroller to Design a boost converter-  4-Mar-04 EDN Design Ideas:  Boost converters, like other switchers, have traditionally received their control signals from a dedicated circuit.  However, a recent trend is to integrate simple switching-power-supply building blocks into generic devices, such as microcontrollers.  An excellent example of this concept is a microcontroller that combines digital and analog circuitry and makes it easier to build simple power supp __ Circuit Design by Ross Fosler, Microchip Technology, Chandler, AZ

Versatile industrial power supply takes high voltage input & yields from eight 1A to two 4A outputs-  EDN Design Ideas:  11/27/2014   This ultra-flexible, highly-featured switching regulator IC might be perfect for your next complex and/or industrial design __ Circuit Design by LTC Design Note

Video Design Idea: Buck regulator controls white LED with optical feedback-  10/25/07  EDN-Video Design Ideas - By using optical feedback, you can stabilize the output level of a high-intensity LED __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

Whistle On-Whistle Off-  This CMOS toggle flip flop circuit has an addition of2bandpass filters and condenser microphone so the relay can be toggled by whistling at it. __ Designed by Bill Bowden

Switchmode Power Supply:  #'s -F         G - R         S - Z

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