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Flyback Circuits
Fly Back Circuits:   #'s - K      
L - Z
 

Last Updated: October 24, 2017 02:54 PM


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

Circuits Designed by Dave Johnson, P.E. :
Negative 0.5 Volt SupplyThis simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Simple Circuit Negative Supply CircuitThis simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Voltage Converters-0.5 to 6 VoltsConventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very. . . Circuit by Dave Johnson P.E.-May, 2007

Line Output / Flyback transformer tester -  This is a 'ringer'-type tester I (Bob Barker) originally designed for in-circuit testing of Line Output (Flyback) transformers in TVs and computer monitors.  After a couple of technician-years of evaluation in actual servicing situations, it's also proved to be heLPFul in locating shorted diodes, capacitors and deflection yokes in horizontal deflection stages.  LOPT/FBT condition is shown on an 8 LED 'bargraph' display.   __ Designed by Bob Barker, not the TV Host

LT3757 Boost, Flyback, SEPIC & Inverting Controller-Video Product Brief -  The LT3757 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages.  It can be configured as either a boost, flyback, SEPIC or inverting controller.  The LT3757 drives a low side external N-channel power MOSFET from an internal regulated 7.2V supply.  The___ Linear Technology/Analog Devices App Note, Kevin B. Scott-Strategic Marketing Engineer Jun 4th 2010

LT3798 Isolated No Opto-Coupler Flyback Controller with Active PFC-Video Product Brief -  The LT®3798 is a constant-voltage/constant-current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter.  A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, ___ Linear Technology/Analog Devices App Note, Bruce Haug-Product Marketing Engineer Mar 6th 2012

LTC Design Note 509: Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V -  EDN-Design Ideas 03/30/2014     A tiny, integrated flyback converter requires minimal support componentsCircuit Design 

LTC Design Note: Monolithic no-opto isolated flyback converter provides versatile solution -  EDN-Design Ideas 05/04/2015    This versatile chip handles flyback, buck, boost, and negative input, and features low standby current and up to 18W outputCircuit Design 

LTC1871 No Rsense Controller is Small & Efficient in Boost Flyback & Sepic Applications -  DN296 Design Notes___ Linear Technology/Analog Devices

LTC3765/LTC3766 Isolated Forward Converter Chipset with Active Clamp Reset-Video Product Brief -  The LTC®3765 is a start-up controller and gate driver for use in a self-starting secondary-side control forward converter.  When combined with the LTC3766 secondaryside synchronous forward controller, a complete isolated power supply is created using a minimum of discrete parts.  A proprietary scheme is used to multiplex gate___ Linear Technology/Analog Devices App Note, Bruce Haug-Product Marketing Engineer Mar 6th 2012

Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V -  EDN-Design Ideas 03/30/2014     A tiny, integrated flyback converter requires minimal support components__ Circuit Design by LTC Design Note 509

Monolithic no-opto isolated flyback converter provides versatile solution -  EDN-Design Ideas 05/04/2015    This versatile chip handles flyback, buck, boost, and negative input, and features low standby current and up to 18W output__ Circuit Design by LTC Design Note

Negative 0.5 Volt Supply -  This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Output Adjustable Flyback Converter -  A high voltage step-up DC power supply using adjustable flyback conversion.   __ Designed by Simon Oh

Powerlabs Flyback Driver -  This is by far the best project for someone who is already familiar with High Voltage, but wants to take their experiments to the next level: It requires very little previous experience and skills with soldering and identifying components, and there are virtually no adjustments to be made.  The danger is minimal, as fly back transformers are intrinsically low power devices, not capable of outputting lethal currents (due to the hair-thin secondary windings), and yet it will give a careless experimenter a nasty RF burn if he accidentally touches the HV wire (nothing beats learning from your mistakes).  If you have never experimented with HV before though, I recommend you start off with an electrostatic project.  This circuit is not a toy! __ Designed by Sam Barros

Quasiresonant converter uses a Simple Circuit CMOS IC -  04/15/04  EDN-Design Ideas Figure 1 shows a flyback power supply that has low noise and uses a simple CMOS 4093 IC for its control.  The electrical noise of a converter arises mainly when current switches on.  Diode recovery and charging parasitic capacitances__ Circuit Design by Francesc Casanellas, Aiguafreda, Spain

Quasiresonant Flyback Converter Easily Charges Energy-Storage Capacitors -  23-Jul-09 EDN-Design Ideas Increase energy transfer by using boundary-conduction mode__ Circuit Design by Todor Arsenov, Toronto, ON, Canada

Recover the leakage energy of a flyback transformer -  04/18/13  EDN-Design Ideas This design can recover the leakage energy of a flyback transformer and minimize over-voltage stress to the switching device.  __ Circuit Design by Todor Arsenov

Royer Flyback driver -  This circuit is an auto-oscillating, resonant, current fed High voltage DC-DC converter.  The output voltage is calculated as follows Vout = Vin * pi * Nsecondary / Nprimary.  The primary peak voltage is Vin * pi , and the rms voltage is Vin*pi*0.7  __

Simple Circuit & Efficient Sub-2W Isolated Power Supply -  The non-synchronous flyback topology is widely used in isolated power supplies ranging from sub watt power levels to tens of watts.  With more green-mode standards emerging around the world, improving light load efficiency and reducing no-load input standby current are more demanding than ever.  Unfortunately, the traditional___ Linear Technology/Analog Devices App Note, Min Chen Senior Design Engineer-Power Products Nov 5th 2012

Simple Circuit High Efficiency Isolated Flyback Supply Without Optoisolator -  DN1011 Design Notes___ Linear Technology/Analog Devices

Simple Circuit Negative Supply Circuit -  This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Single Transistor Flyback Driver -  This is by far the best project for someone who is already familiar with High Voltage, but wants to take their experiments to the next level: It requires very little previous experience and skills with soldering and identifying components, and there are virtually no adjustments to be made.  The danger is minimal, as fly back transformers are intrinsically low power devices, not capable of outputting lethal currents (due to the hair-thin secondary windings), and yet it will give a careless experimenter a nasty RF burn if he accidentally touches the HV wire (nothing beats learning from your mistakes).  If you have never experimented with HV before though, I recommend you start off with an electrostatic project.  This circuit is not a toy! __ Designed by Sam Barros

Switch-mode Power Supply for a Tube Car Amplifier -  To minimize heat loss on any transistor, I use two pass FETs.  In the car, input voltage is either 11.5-12.5V (engine off) or 13.5-14.5V (engine on).  In the first case, T1 and T2 are fully ON, no need for heatsink.  In the second case, T1 is OFF, T2 ON, all voltage and power excess __ Contact: klausmobile @ yahoo.Com

Synchronous flyback provides high-efficiency conversion -  07/22/04 EDN-Design Ideas Buck regulators are usually the first choice when you design nonisolated step-down regulators unless the ratio of VIN to VOUT is greater than 10, the input voltage is high, or both.  Low duty cycle can be problematic for FET drivers and cause current-mode control loops to lose control.  Efficiency can fall dramatically to 60 to 70% at low VOUT and current of only a few amps__ Circuit Design by Wayne Rewinkel, National Semiconductor, Phoenix, AZ

The Output adjustable Flyback converter -  A high voltage step-up DC power supply using adjustable flyback conversion.   __ Designed by Simon Inhwan Oh

Two Phases to Cut Current & Improve EMI -  11/12/09 EDN-Design Ideas In DC/DC-converter applications in which the input voltage may be lower or higher than the output voltage, you can use either a flyback converter or a SEPIC (single-ended-primary-inductor converter).  SEPICs offer lower input-curre__ Circuit Design by Goran Perica, Linear Technology App Note, Milpitas, CA

UCC3819 250-W Pfc Boost follower Preregulator Design -  This is an App Note that describes a reference design.  This paper reviews the benefits of a boost follower topology and the design of a 250-W PFC boost follower preregulator.   __

Universal Input 48W PFC Application -  The LT3798 is a constant voltage/constant current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter.  A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, ___ Linear Technology/Analog Devices App Note, Dec 5th 2011

Use Two Phases to Cut Current & Improve EMI -  11/12/09 EDN-Design Ideas In DC/DC-converter applications in which the input voltage may be lower or higher than the output voltage, you can use either a flyback converter or a SEPIC (single-ended-primary-inductor converter).  SEPICs offer lower input-curre__ Circuit Design by Goran Perica, Linear Technology, Milpitas, CA

VFD (Vacuum Fluorescent Display) Flyback Power Supply -  The LT3758 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages.  It can be configured as either a boost, flyback, [Linear Technology, SepIC or inverting converter.  The LT3758 drives a low side external N-channel power MOSFET from an internal regulated 7.2V supply.  The___ Linear Technology/Analog Devices App Note, Jan 16, 2012

Voltage Converters-0.5 to 6 Volts -  Conventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very. . . Circuit by Dave Johnson P.E.-May, 2007

Your source for cheap n' easy high voltage, the Flyback transformer -  A very simple road to your basic high voltage generator is the transistor driven flyback transformer.  This circuit uses a common flyback transformer (you probably have more than one in your house right now) to boost typical battery voltages up to the multi-kilovolt range.  It will make a several thousand-degree continuous 2 cm plasma arc.  This page is designed to help you get yours working as quickly and painlessly as possible __ Designed by Greg Miller


Fly Back Circuits:    #'s - K       L - Z

 


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