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Power Supplies:  Switch Mode
Switchmode Power Supply:  #'s -F         G - R         S - Z
Boost,   Buck,   Buck/Boost

Power Supplies -- Main Page           Converters -- Main Page
 

Last Updated: October 18, 2017 05:04 AM


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

1.5A Rail-to-Rail Output Synchronous Step-Down Regulator Adjusts with a Single Resistor-  02/03/14 - EDN-Design Notes One wire brings power & data to LCD module - A new regulator architecture, the LTC3600 (first introduced with the LT3080 linear regulator) , has wider output range and better regulation than traditional regulators.  Using a precision 50μA current source and a voltage follower, the output is adjustable from 0V to close to VIN.  Normally, the lowest output voltage is limited to the reference voltage __ Circuit Design by Jeff Zhang, also see Linear Technology Design Note 506

120 Volt AC Lamp Chaser using Solid State Relays-  This circuit is similar toLED clock using12 neon indicator lamps instead of LEDs.  It operates from2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks.  High voltage (70 volts) forneon lamps is obtained from a small __ Designed by Bill Bowden

13.8 Volt, 40 Ampere switching power supply-  A heavy duty, highly efficient, small and lightweight power supply specially designed for use with communication equipment.  This article was originally published in the QST magazine.  Includes text, schematic diagram, printed circuit board layout, and some photos. __ Designed by Manfred Mornhinweg

1-kV power supply produces a continuous arc-  02/05/04  EDN Design Ideas:  Designing a high-voltage switching power supply that can produce a sustained arc can be challenging.  This compact and efficient design delivers 1 kV at 20W and can withstand a continuous arcing, or short-circuit, condition (Figure 1 __ Circuit Design by Robert Sheehan, Linear Technology, Milpitas, CA

2 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

2 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

42V quad Monolithic synchronous step-down regulator with 30μA quiescent current-  EDN-Design Ideas - 08/30/2016  This circuit impresses with four 2.2MHz bucks in a tiny package - Circuit Design  by LTC Design Note

5.1V, –10V, 15V Triple Output TFT-LCD Supply-  From an input range of 1.5V to 4.6V, the LTC3450 generates all required bias voltages for a TFT LCD display: Avdd (5.1V at 10mA) , VGH (15V at 500uA) and VGL (-10V at 500uA) __ Linear Technology/Analog Devices App Note, Mar 24th 2010

5.1V, 15V,-5V Triple Output TFT-LCD Supply-  From an input range of 1.5V to 4.6V, the LTC3450 generates all required bias voltages for a TFT LCD display: Avdd (5.1V at 10mA) , VGH (15V at 500uA) and VGL (-5V at 500uA) __ Linear Technology/Analog Devices App Note, Mar 24th 2010

8 Switcher Powers High-Performance µPs-  04/13/95 EDN Design Ideas:  The circuit in Fig 1  delivers 8A for driving as many as two of today's high-performance, high-speed µPs.  You can also optimize the design for lower current by changing a few components.  Most systems use a low-current 12V bias supply and a poorly regulated high-current 5V to power the logic.  However, __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

A Simple Circuit Switching Power Supply-  A Versatile and useful supply to Experiment with, Good for the Beginner to learn.  This is Direct 110 VAC input. __ Designed by G.L. Chemelec

Add a signal-strength display to an FM receiver IC-  09/05/02  EDN Design Ideas:  The Philips (www.  semiconductors.  philips.  co) TDA7000 integrates a monaural FM-radio receiver from the antenna connection to the audio output.  External components include one tunable LC circuit for the local oscillator, a few capacito __ Circuit Design by José Miguel-López, RF Center Ltd, Barcelona, Spain

Add an auxiliary voltage to a buck regulator-  31-Oct-02 EDN Design Ideas:  You often need more than one regulated output voltage in a system.  A frequently used and reasonably simple way to create this auxiliary output voltage is to add a second winding to the output inductor, creating a coupled inductor or a transformer, followed by a diode to rectify (peak-detect] this output voltage __ Circuit Design by John Betten, Texas Instruments, Dallas, TX

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

Boost converter works with wide-range negative-Input supply-  18-Mar-04 EDN Design Ideas:  Assume that a design requires positive voltage, but only a negative-voltage power source is available.  Using a standard boost-converter IC in the circuit of Figure 1, you can efficiently generate a positive voltage from a negative source.  The boost converter generates an output voltage that's higher than the input voltage __ Circuit Design by Mike Wong, Intersil Corp, Milpitas, CA

Booster enables reliable solenoid operation-  EDN Design Ideas:  10/30/2012  Rather than increase the power supply voltage and current capability, this workaround uses a momentary voltage boost to turn on a solenoid __ Circuit Design by Shankar Nakhe

Buck converter charger also provides system power-  11/16/96 Literature Number: SNVA532Switching Regulator providescharge voltage setpoint with Current regulation, and second Switching Regulator provides 5V System Power -Many systems require long-time operation during periods of power loss.  Often, a gel or wet-cell lead-acid battery isbest choice because of high capacity and relatively low cost.  The battery charges __ Designed by Application Note Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ

Buck Mode Switching Regulator for Solar Applications-  The purpose of a voltage regulator circuit is to take a variable input voltage and produce a steady output voltage.  Two common regulator types are linear and switch-mode.  Linear regulators are simple, but waste a lot of power in the process of regulating the voltage.  Linear regulators can be thought of as self adjusting series resistors.  Switch-mode regulators such as this one are much more efficient.  Switch-mode regulators convert DC input voltages to pulses of high voltage DC.  The DC pulses are used to charge a storage capacitor to the desired output voltage.  The voltage is regulated by varying the width of the DC pulse __ Designed by G. Forrest Cook

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

Buck/Boost Charge Pump Regulator Powers White LEDs from a Wide 1.6 Volt to 5.5 Volt Input-  App Note #1021__ Maxim Integrated

Buck-Boost Converter In SuperCap Backup Power Supply-  The LTC3536 is an extended VIN range, fixed frequency, synchronous buck-boost DC/DC converter that operates from input voltages above, below or equal to the regulated output voltage.  The topology incorporated in the LTC3536 provides low noise operation, making it ideal for RF and precision measurement applications __ Designed by Linear Technology/Analog Devices App Note, Aug 8, 2011

Circuit reduces negative-voltage stresses on control IC-  04/18/02 EDN Design Ideas:  In a synchronous, buck switching power supply, the two FETS and the output inductor meet at the phase node (Figure 1).  The phase node often connects directly to the control IC.  The voltage on this node swings from the input voltage to some voltage lower than ground.  If the voltage goes too far below ground, the ESD structures or other circuitry within the control IC can become forward-bia __ Circuit Design by Michael Day, Texas Instruments Inc, Dallas, TX

Configure buck converter for boost operation-  12/17/98 EDN Design Ideas:  (File contains many circuits.  Scroll to find this one.) __ Circuit Design by Mehrzad Koohian, Semtech Corp, Newbury Park, CA

Constant-on-time buck-boost regulator converts a positive input to a negative output-  7-Dec-04 EDN Design Ideas:  Buck regulators find wide application as step-down regulators for converting large positive input voltages into a smaller positive output voltages.  Figure 1 shows a simplified buck regulator that operates in continuous-conduction mode—that is, the inductor current always remains positive.  The output voltage, VOUT, is equal to D×VIN, where D is the duty-cycle ratio of the buck switc __ Circuit Design by Robert Bell, National Semiconductor Inc, Chandler, AZ

Controlling slew times tames EMI in offline supplies-  14-Nov-02 EDN Design Ideas:  EMI from offline switching power supplies typically causes all sorts of problems for power-supply designers.  You may need a large EMI filter to meet FCC emission requirements.  Switchers for high efficiency produce high-frequency switching noise that can propagate through the rest of the system and cause problems __ Circuit Design by David Canny, Linear Technology Corp, Milpitas, CA

Critical-mode control stabilizes switch-mode power supplies-  04/23/98 EDN Design Ideas:  Discontinuous-conduction-mode operation eases switch-mode power-supply design and allows for better response to step-load changes.  Operating at the critical-conduction point--beginning a new cycle at the exact point the inductor current falls to zero--ensures that the converter stays in discontinuous-conduction mode. __ Circuit Design by Christophe Basso, Motorola Semiconductors

DC/DC Controller Generates Negative Supply-  06/08/95 EDN Design Ideas:  A Switch mode Power Supply controller plus a diode capacitor network generate the modest negative Supply Current needed for OpAmps or for LCD Bias, without inductors. __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Depletion-Mode MOSFET Kick-Starts Power Supply-  10-Jan-08 EDN Design Ideas:  A depletion-mode MOSFET virtually eliminates power wasted in switcher's start-up circuitry __ Circuit Design by Gregory Mirsky, Milavia International, Buffalo Grove, IL

Design Notes: 1.5A Rail-to-Rail Output Synchronous Step-Down Regulator Adjusts with a Single Resistor-  02/03/14 - EDN-Design Notes One wire brings power & data to LCD module - A new regulator architecture, the LTC3600 (first introduced with the LT3080 linear regulator) , has wider output range and better regulation than traditional regulators.  Using a precision 50μA current source and a voltage follower, the output is adjustable from 0V to close to VIN.  Normally, the lowest output voltage is limited to the reference voltage __ Circuit Design by Jeff Zhang, also see Linear Technology Design Note 506

Design Notes: Dual controller provides 2μs step response & 92% efficiency for 1.5V rails-  12/29/13  EDN-Design Notes Use a heated diode as a flow sensor. The LTC3838 is a dual output, dual phase buck controller that employs a controlled constant on-time, valley current mode architecture to provide fast load step response, high switching frequency, and low duty cycle capability.  The switching frequency range is 200kHz to 2MHz—its phase-locked loop keeps the frequency constant during steady-state operation and can be synchronized to an external clock.  The LTC3838 accepts a wide input range, 4.5V to 38V, and can produce 0.6V to 5.5V outputs. __ Circuit Design by Linear Technology Design Note 505

Diagnose LEDs by Monitoring the switch-mode duty-cycle-  04/09/09  EDN Design Ideas:  Engineers often monitor the forward voltage, VF, of HB LEDs (high-brightness light-emitting diodes] to assess the LEDs’ health.  Big changes in forward voltage can indicate deterioration or even a complete failure of one or more LEDs __ Circuit Design by Fons Janssen, Maxim Integrated Products Inc, Bilthoven, the Netherlands

Discrete component buck converter drives HB LEDs-  03/05/09  EDN Design Ideas:  With just a few components, you can provide sufficient power to operate a high-brightness LED from a battery __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

Dual 9A, step-down μModule regulator with digital power system management-  EDN-Design Ideas - 08/01/2016  This power micro-module includes voltage control and telemetry readback (including temperature, Vin/out & Iin/out) via PMBus - Circuit Design  by LTC Design Note

Dual controller provides 2μs step response & 92% efficiency for 1.5V rails-  12/29/13  EDN-Design Notes Use a heated diode as a flow sensor. The LTC3838 is a dual output, dual phase buck controller that employs a controlled constant on-time, valley current mode architecture to provide fast load step response, high switching frequency, and low duty cycle capability.  The switching frequency range is 200kHz to 2MHz—its phase-locked loop keeps the frequency constant during steady-state operation and can be synchronized to an external clock.  The LTC3838 accepts a wide input range, 4.5V to 38V, and can produce 0.6V to 5.5V outputs. __ Circuit Design by Mike Shriver

Eight Switcher Powers High-Performance µPs-  04/13/95 EDN Design Ideas:  The circuit in Fig 1  delivers 8A for driving as many as two of today's high-performance, high-speed µPs.  You can also optimize the design for lower current by changing a few components.  Most systems use a low-current 12V bias supply and a poorly regulated high-current 5V to power the logic.  However, __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA


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

 


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