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Power Supplies:  DC to DC / Switch Mode and DC to DC Converters
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Last Updated: November 30, 2017 10:28 AM

Circuits Designed by Dave Johnson, P.E. :

 5+V Classic Linear 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 . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2009

 50/60Hz Sync Generator-Fully Isolated - This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation. . . Circuit by Dave Johnson P.E.-December, 2004


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

5 volt charger adapter using LNK616PG controller -  (LNK616PG) A very simple 5 W constant voltage , constant current(CV/CC) universal-input power supply for cell phone or similar charger applications can be designed using the LNK616PG product from the LinkSwitch-ii family.  The LNK616PG was developed to cost__ 

5 volt power supply -  Schematic only, no circuit description __ Designed by Andy Wilson

5+V Classic Linear 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 . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2009

50 Watt per square inch High Power Density DC/DC Converter -  This 50 Watt Step down (buck) power converter is packaged into less than 1 square inch.  This state of the art power density is achieved by the use of the latest semiconductors, inductors and over 20 years of power supply design experience.  A relatively low switching frequency allows the switching waveform __ Designed by Steve Hageman

50/60Hz Sync Generator-Fully Isolated -  This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation. . . Circuit by Dave Johnson P.E.-December, 2004

500kHz 6a Monolithic Boost Converter LT1370 -  DN183 Design Notes__ Linear Technology/Analog Devices

50W Capacitor Charger -  An upgraded capacitor bank charger.5x better than the boost converter! __ 

555 DC Voltage Doubler -  This dc voltage doubler circuit produces a voltage that is twice its voltage supply.  This is useful when a higher voltage level is needed out of a single lower voltage power supply.  Since the current consumption levels are low in such cases, the circuit can be built with minimal resources.  Voltage Doubler Circuit Schematic The __ Designed by Popescu Marian

555 Voltage Doubler Relay Driver -  These novel relay driver circuits have the ability to pick up a relay with a coil voltage rating equal to double Vcc.  After pickup, the relay armature is held via the application of Vcc.  Under this condition, the coil power is reduced by the square of the voltage ratio, or to 25%.  This is the ultimate in relay economy—the __ Designed by Jim Keith

55V High efficiency buck-boost power manager & multi-chemistry battery charger -  EDN Design Ideas:  01/01/2016    A versatile, efficient, multi-chemistry battery charger design operates in buck & boost modes. __ Circuit Design by LTC Design Note

5-to-1.8V converter works without magnetICs -  04/13/00  EDN Design Ideas:  To derive 1.8V from 5V, you might think of using a switch-mode regulator.  Switchers are highly efficient but also complicated and expensive.  Linear regulators, too, are out of the question unless your design can tolerate 40% efficiencies.   __ Circuit Design by Dan Christman, Maxim Integrated Products, Sunnyvale, CA

5-to-1.8V Converter Works Without MagnetICs -  To derive 1.8V from 5V, you might think of using a switch-mode regulator.  Switchers are highly efficient but require inductors.  Linear regulators are simple, but would have only 40% efficiency.  This circuit is more than 70% efficient (Figure 2a) , sources as much as 100 mA, and uses no inductor[App Note 673]__ Maxim Integrated

5V at 6mA for 9.6s Supercapacitor Backup Supply -  The LT1316 is a micropower step-up DC/DC converter that operates from an input voltage as low as 1.5V.  A programmable input current limiting function allows precise control of peak switch current.  Peak switch current can be set to any value between 30mA and 500mA by adjusting one resistor.  __ Linear Technology/Analog Devices App Note, Mar 24th 2010

5V power supply teams low-dropout regulator, charge pump -  8-Jan-04 EDN Design Ideas:  Auxiliary power of 3.3V is replacing the 5V auxiliary power that "silver boxes" supply in most computer systems, but some circuits still require a 5V supply.  Such systems impose the messy task of creating a central 5V auxiliary supply from the 3.3V auxiliary supply and then routing 5V power throughout the motherboard __ Circuit Design by Jim Christensen, Maxim Integrated Products, Sunnyvale, CA

5V Supply Derives Power From Three-Wire RS-232C Port -  10/26/95 EDN Design Ideas:  The circuit in Fig 1  produces a semiregulated 5V output from an RS-232C port.  Unlike a PC-mouse supply or comparable circuits that rely on the DTR and RTS modem-control signals, this circuit operates with a three-wire port, GND, RX, and TX, and obtains power only from the TX line.  Except at high duty cycles, the TX line (RCV-232 on the circuit side) remains __ Circuit Design by John Wettroth, Maxim Integrated Products, Sunnyvale, CA

5V to ±12V AT 320mA Dual Supply Boost/Inverting Converter -  The LT3471 dual switching regulator combines two 42V, 1.3A switches with error amplifiersthat can sense to ground providing boost and inverting capability.  The low VCESAT bipolar switches enable the device to deliver high current outputs in a small footprint.  The LT3471 switches at 1.2MHz, allowing the use of tiny, low cost__ Linear Technology/Analog Devices App Note, Jan 30th 2012

5V to ±12V AT 550mA Split Supply at 1.5MHz -  The LT8582 is a dual independent channel PWM DC/DC converter with a power good pin and built-in fault protection to help guard against input overvoltage and overtemperature conditions.  Each channel consists of a 42V master switch and a 42V slave switch that can be tied together for a total current limit of 3A.  __ Linear Technology/Analog Devices App Note, Jan 30th 2012

5V to ±12V AT 80mA Split Supply -  The LT3582 series includes two monolithic converters, one Boost and one inverting.  The Boost converter has an integrated power switch and output disconnect switch.  The inverting converter uses a single inductor topology and includes an integrated power switch.  Both Boost and inverting converters use a novel control scheme resulting__ Linear Technology/Analog Devices App Note, Jan 30th 2012

5V to 3.3V Regulator with Fail-Safe Switchover -  DN82 Design Notes __ Linear Technology/Analog Devices

5V to 50V Low Noise APD Bias Power Supply with Temperature Compensation -  The LT3571 is a current mode step-up DC/DC converter designed to bias avalanche photodiodes (APDs) in optical receivers with an output voltage up to 75V.  The LT3571 features a high side fixed voltage drop APD current monitor with better than 10% relative accuracy over the entire temperature range.  The integrated power switch, __ Linear Technology/Analog Devices App Note, Mar 29th 2010

5V to 69V Low Noise APD Bias Supply with Soft-Start -  The LT3571 is a current mode step-up DC/DC converter designed to bias avalanche photodiodes (APDs) in optical receivers with an output voltage up to 75V.  The LT3571 features a high side fi xed voltage drop APD current monitor with better than 10% relative accuracy over the entire temperature range.  The integrated power switch, __ Linear Technology/Analog Devices App Note, Mar 29th 2010

5V to 85V Low Noise APD Bias Power Supply -  The LT3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers.  it can provide up to 90V output.  The LT3482 features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range.  The integrated__ Linear Technology/Analog Devices App Note, Mar 29th 2010

5V, 2A Output from Automotive Input with Continuous Operation from 6V to 45V -  The LT3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power.  it drives a low side external N-channel power MOSFET from an internally regulated 7V supply.  No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage__ Linear Technology/Analog Devices App Note, Jan 27th 2011

5V/1A Power Supply -  Tendency of entry: 220V AC; Tendency of expense: 5V DC; Current of expense: 1A __ Designed by Kyriakos Kontakos

5Vin to +/-12VoutAT40mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3574 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 0.65A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

6 to 12 Volt Converter -  This circuit can provide up to 800mA of12V power from a 6 Volt supply.  The circuit is simple, about 75% efficient and quite useful __ Designed by Aaron Cake

6 x 6 Loop Antenna -  This new loop antenna is his best design yet and I am proud to be the first to present his work.  it uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz, 5000KHz __ Designed by Graham Maynard

600 Volt Power Supply -  Simple 600 Volt DC power supply.  Convert 230V AC to 300V and 600V DC.  __ 

60-mA Current Source Feeds Telecomm Lines -  12/18/97 EDN Design Ideas:  An isolated 60-mA current source provide as 120V of compliance for use in telecommunication interfaces (Figure 1).  Constant-current line feed provide as dc power for downstream circuitry independent of line length and provide as inherent short-circuit protection.  The key to isolated __ Circuit Design by Kurk Mathews, Linear Technology Corp, Milpitas, CA

60V 3A Step-Down DC/DC Converter has Low Dropout & 100µA Quiescent Current -  DN352 Design Notes __ Linear Technology/Analog Devices

60V High Efficiency Buck Switching Regulators in SO-8 -  DN202 Design Notes__ Linear Technology/Analog Devices

60V Step-Down DC/DC Converter has Only 100µA Quiescent Current -  DN1007) Design Notes__ Linear Technology/Analog Devices

60V/3A Step-Down DC/DC Converter Maintains High Efficiency over a Wide Input Range -  DN301 Design Notes__ Linear Technology/Analog Devices

6-12Vin to ±5V AT 50mA Split Supply -  An easy-to-implement split-voltage power supply using the LTC3388 yields a low quiescent current, high efficiency solution for powering low current analog circuits that need a virtual ground output.  The output voltage of each device is digitally programmable to four output voltages from 1.2V to 5.0V and will support a load __ Linear Technology/Analog Devices App Note, Jan 30th 2012

65V 500mA step-down converter fits automotive & industrial applications -  05/31/14  EDN Design Ideas:  This switcher is happy to drop a 60V input all the way down to 0.8V.  The trend in automobiles and industrial systems is to replace mechanical functions with electronics, thus multiplying the number of microcontrollers, signal processors, sensors, and other electronic devices throughout.  The issue is that 24V truck electrical systems and industrial equipment use relatively high voltages for motors and solenoids while the microcontrollers and other electronics require much lower voltages.  As a result, there is a clear need for compact, high efficiency step-down converters that can produce very low voltages from the high input voltages __ Circuit Design by LTC Design Note

6A Monolithic synchronous DC/DC step-down converter with digital power system management -  EDN Design Ideas:  01/02/2017    Efficient 6A buck sports PMBus configuration and monitoring __ Circuit Design by LTC Design Note

7V, 50mW OLED Driver from a 2V to 5.5V input -  The LTC3459 controls peak inductor current when ViN is greater than or less than VOUT.  This allows current to be controlled during start-up in a boost application or VOUT to be regulated below ViN when powered from a fresh battery.  Peak current control makes the LTC3459 an ideal candidate for charging a back-up source such__ Linear Technology/Analog Devices App Note, Mar 29th 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

80V synchronous 4-switch buck-boost controller Delivers hundreds of watts with 99% efficiency -  EDN Design Ideas:  12/26/2014     An 80V synchronous 4-switch buck-boost controller that can provide hundreds of watts at up to 99% efficiency with a single inductor.  Four servo loops __ Circuit Design by LTC Design Note

9 Volt 2 Amp PSU -  A simple 9 Volt 2 amp supply using a single IC regulator.   __ Designed by Andy Collison

9 Volt Stabilized Power Supply -  Schematic only __ Designed by Tony van Roon  VA3AVR

9-24Vin to 1.8VoutAT1A Low EMI uModule Power Supply -  The LTM8031 is an electromagnetic compatible (EMC) 36V, 1A DC/DC μModule® buck converter designed to meet the radiated emissions requirements of EN55022.  Conducted emission requirements can be met by adding standard filter components.  included in the package are the switching controller, power switches, inductor, filters and all support components.  Operating over an input voltage range of 3.6V to 36V, the LTM8031 supports an output voltage range of 0.8V to 10V, and a switching frequency range of 200kHz to 2.4MHz, each set by a single resistor.  Only the bulk input and output filter capacitors are needed to finish the design.  The low profile package (2.82mm) enables utilization of unused space on the bottom of PC boards for high density point of load regulation.  __ Linear Technology/Analog Devices App Note, Apr 22, 2011

9v Converter using Two AA Cells -  Normally, 9V PP3 batteries last less than a couple of hours if used continuously.  These cannot be used if the voltage is below 7.8V.  Say goodbye to these expensive 9V batteries...__ Electronics Projects for You

9V to 2A PSU -  A simple 9 Volt 2 amp supply using a single IC regulator.   __ Designed by Andy Collison

9V-30Vin to +/-5VoutAT350mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3573 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary-side flyback waveform.  A 1.25A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

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