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Last Updated: November 21, 2017 05:46 AM

Circuits Designed by Dave Johnson, P.E. :

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


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

3 Input Supply Powers 3.3 Volt Portables -  The single-ended primary-inductance converter (SEPiC) of Figure 1 accepts input voltages ranging from 3V to over 6V, and produces a regulated 3.3 V, 200mA output.  it accepts an input voltage from three sources: a 5V dc wall cube, a 3-cell AA battery, and a lithium backup battery.  App Note 136 __ Designed by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

3 parts provide tenfold increase in switcher current -  08/22/02 EDN Design Ideas:  industrial-control circuits often derive their power from widely varying sources that can exceed the 40V maximum rating of popular switching iCs.  This design idea presents a simple, flexible, and inexpensive buck switcher that converts an input voltage as high as 60V to 5V at several amps.  The circuit is unique in that it boosts current with almost no compromise in performance, size, or cost __ Circuit Design by Wayne Rewinkel, National Semiconductor, Sunnyvale, CA

3 Phase Voltage Multiplier -  The Cockcroft-Walton turbine voltage multiplier.   __ Designed by REUK-Renewable Energy UK website

3.1V-30Vin to Isolated 5V AT 300mA -  Designing with the LTM8047 and LTM8048 is easy.  This circuit shows a complete LTM8048-based isolated power supply, requiring only the addition of capacitors for input, output, and biasing, and a resistor to set the output voltage.  __ Linear Technology/Analog Devices App Note,

3.3V converter Delivers 3W from Li-Ion battery -  11/05/98 EDN-Design ideas (Several circuits here, scroll to find this one) Lithium-ion batteries are rapidly gaining popularity in portable applications because of their superior energy density, low self-discharge rate, and high cell voltage.  When you use one Li-ion battery to power a 3.3V DC/DC converter; however, you encounter a problem, because the battery voltage.    __ Circuit Design by David Salerno, Unitrode Corp, Merrimack, NH

3.3V lithium-cell supply requires one inductor -  08/05/99 EDN Design Ideas:  Because of growing popularity of lithium-ion (Li-ion) batteries and 3.3 V power supplies, portable-equipment designers must often create a 3.3 V supply that a single Li-ion cell can power __ Circuit Design by Matt Schindler and Jay Scolio, Maxim Integrated Products, Sunnyvale, CA

3.3V to 5.5V input (500mA max) charging 4.4mF super cap (3.3V at 800mA) & providing 1.8V at 400mA -  The LTC3619 is a Dual 400mA/800mA monolithic synchronous buck regulator with an input supply voltage range is 2.5V to 5.5V, making it ideal for Li-ion and USB powered applications __ Linear Technology/Analog Devices App Note, Mar 23, 2010

3.3V to 50V Low Noise APD Bias Supply with Ultrafast Current Monitor Transient Speed -  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

3.3V to 70V Low Noise APD Bias Power Supply with Fast Current Monitor Response -  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

3.3V/10mA Regulator from a 4mA to 20mA Loop -  This circuit is a 3.3 V/10mA regulator that extracts its power from a 4mA to 20mA loop.  This circuit demonstrates how an LTC1474/LTC1475-based regulator is easily optimized for such low current applications.  The 2W sense resistor limits the peak inductor current to 40mA to minimize current ripple and provide good efficiency __ Linear Technology/Analog Devices App Note, Mar 16th 2011

30 Amp heavy duty power supply -  This is an easy to make power supply which has stable, clean and protected output voltage.  The overall dimensions can be kept (relative) small by using TO220 darlington BDX-33 transistors.  Using 3 BDX-33 darlington transistors is almost 3 times the amount of amps then the power supply delivers, making it real though to brake ;).  Although you could use this design to deliver 20 amps (with almost no modifications  __ Designed by Guy Roels ON6MU

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

30V power supply with +5V -  i made the power supply which makes about +30V with +5V power supply.  The direct current is changed into the alternating current by the oscillator which used the schmitt trigger inverter which has the hysteresis characteristic and the __ Designed by Seiichi Inoue

36V-72Vin to 12VoutAT2A Output, Isolated Telecom Supply (No Opto or Third Winding) -  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

3A 2MHz Monolithic Synchronous Step-Down Regulator Provides a Compact Solution for DDR Memory Termination -  DN309 Design Notes__ Linear Technology/Analog Devices

3-Band Equalizer -  Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high.  With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz.  Supply voltage may be anything from 6 to 30 Volts.  Maximum boost 20dB is only realized with maximum supply voltage __ Designed by Andy Collison

3-Channel White-LED Driver Uses Simple Circuit Step-Down DC/DC Converter -  09/13/12  EDN Design Ideas:  Drive multiple LEDs with current mirrors from a single step-down converter.   __ Circuit Design by Nora Jacalan Esteves, Technor Semiconductor LLC, Pleasanton, CA

3-Input Supply Powers 3.3V Portable -  04/13/95 EDN Design Ideas:  The single-ended primary-inductance converter in Fig 1 accepts input voltages ranging from 3 to more than 6V and produces a regulated 3.3 V, 200-mA output.  The converter accepts an input voltage from three sources a 5V dc wall cu __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

3MHz Micropower Synchronous Boost Converters Deliver 3W from Two Cells in a Tiny MSOP Package -  DN246 Design Notes __ Linear Technology/Analog Devices

3-Phase LTC3733 Provides High Performance Power Solutions for AM D Opteron & Athlon 64 Processors -  DN326 Design Notes__ Linear Technology/Analog Devices

3V to 9V DC Converters -  Here are some 3V to 9V DC converter circuits that were requested by some of our visitors.  it may be heLPFul to have one of this converters when no 9V battery is available or if you consider that they are too expensive.  The first circuit is very simple, it uses the TL496 power supply controller, a coil and a electrolytic __ Designed by Popescu Marian

4.3V to 42Vin 3.3V AT 5A Step-Down Converter -  The LT3976 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V.  Low quiescent current design consumes only 3.3 μA of supply current while regulating with no load.  Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output__ Linear Technology/Analog Devices App Note, Sep 12th 2012

4.5V to 14Vin, 3.3V AT 25A Vout Switches at 2MHz -  A 2MHz, 3.3 V/25A step-down converter.  The LTC3838/LTC3839 can operate at switching frequencies above the AM radio band (fSW > 1.8MHz).  The high switching frequency permits the use of inductors of very small footprint, so that the entire circuit can fit within a 0.9in2 area with both sides populated.  The peak efficiency is 95%, and full load efficiency well above 90% at 25A, even at a frequency of 2MHz.  __ Linear Technology/Analog Devices App Note, Mar 29th 2012

4.5V to 38Vin, 1.2/15A, 1.5V/15A Dual Output, 350MHz Step-Down Converter -  4.5V to 38V input, 1.2/15A, 1.5V/15A dual output, 350MHz step-down converter.  With the output sensed directly through a resistor divider network, the remote sensing scheme in Channel 1 mimics the traditional feedback used in Channel 2.  This novel remote sensing scheme eliminates the diff amp output pin required in other parts__ Linear Technology/Analog Devices App Note, Mar 29th 2012

42V 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current -  11/26/13  EDN-Design Notes   Measure inductance & capacitance over a wide range.  The LT8610 and LT8611 are 42V, 2.5A synchronous step-down regulators that meet the stringent high input voltage and low output voltage requirements of automotive, industrial, and communications applications.  To minimize external components and solution size, the top and bottom power switches are integrated in a synchronous regulator topology, including internal compensation.  The regulator consumes only 2.5μA quiescent current from the input source even while regulating the output.   __ Circuit Design by Hua  Walker Bai

450V Boost Converter -  Charge capacitor banks to hundreds of volts from a 12V battery.__ 

48V to 10.8V at 10A Buck Converter Charger for 3-Series LiFePO4 Battery Pack -  Building a complete charging system with the LTC4000 and a DC/DC converter is nearly as easy as using a dedicated charger iC.  Figure 5 shows the LTC4000 controlling an LT3845A buck converter in a charger designed for a 3S LiFePO4 battery pack (3S refers to three cells in a series configuration).  The LT3845A buck converter is chosen here for its simplicity and high, 60V input voltage capability.  __ Linear Technology/Analog Devices App Note, Mar 29th 2012

48Vin to +/-15VoutAT100mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3512 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform.  The device integrates a 420mA, 150V power switch, high voltage circuitry, __ Linear Technology/Analog Devices App Note, Apr 22, 2011

48Vin to +/-15VoutAT50mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform.  The device integrates a 240mA, 150V power switch, high voltage circuitry, __ Linear Technology/Analog Devices App Note, Jan 27th 2011

48Vin to 12VoutAT200mA Monolithic Isolated Flyback Controller (No Opto or Third Winding) -  The LT3512 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform.  The device integrates a 420mA, 150V power switch, high voltage circuitry, __ Linear Technology/Analog Devices App Note, Apr 22, 2011

48Vin to 5VoutAT0.3A Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform.  The device integrates a 240mA, 150V power switch, high voltage circuitry, __ Linear Technology/Analog Devices App Note, Jan 27th 2011

4MHz Monolithic Synchronous Step-Down Regulators Bring High Efficiency to Space-Sensitive Applications -  DN304 Design Notes__ Linear Technology/Analog Devices

4-Phase Monolithic Synchronous Boost Converter Delivers 2.5A with Output Disconnect in a 5mm x 5mm QFN Package -  DN332 Design Notes __ Linear Technology/Analog Devices

4V to 18V (Cold Crank) Input to 12V Output 3mm Maximum Height All Ceramic SEPIC -  12V buses are often derived from sources with a wide input voltage range.  For instance, automotive solutions can have steady-state operating voltages as high as 18V and as low as 4V for cold-crank conditions.  Figure 4 shows a simple, low cost and low profile (3mm) solution that avoids the high cost of using both a boost and __ Linear Technology/Analog Devices App Note, Jul 20th 2010

4V-60V (Cold Crank) Input to 5V Output DC/DC Automotive Converter -  Ultrawide input voltage requirements are a common design problem for DC/DC converter applications, but when that range includes voltages both above and below the output voltage, the converter must perform both step-up and step-down functions.  The LT3433 is a high voltage monolithic DC/DC converter that incorporates two switch elements, allowing for a unique topology that accommodates__ Linear Technology/Analog Devices App Note, Jul 20th 2010

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