Flyback Circuit Provides Isolated Power Conversion:  01/07/99 EDN-Design Ideas / (added 03/05)) [Note:  File contains multiple circuits scroll to find this circuit]  A common requirement in telecommunications systems is to convert an unregulated 48V line to an isolated, accurate dc supply voltage. The circuit in Figure 1 provides a 5V, 15W output. The circuit uses a UCC3809 primary-side controller, which can also control other single-ended converters. The topology uses peak-current-mode control with a fixed-frequency oscillator. The design is cost-efficient, because it assumes that compensation of the voltage loop occurs on the secondary side, where you would place the error amplifier and reference anyway. By eliminating a primary-side amplifier, you reduce system cost and complexity....

Flyback Controller Improves Cross Regulation for Multiple Output Applications:  DN344  Design Notes (Linear Technology) (app note added 1/06)

Flyback LDO Buck Sync. Buck Reference Design:  Flyback, LDO, Buck and Sync Buck with Vin 10 to 16 V. Multiple output voltages of -24 V, -5 V, 1.5 V, 3.3 V, 5 V, 12 V and 58 V. The total output power is 15 W. (added 3/05)

Flyback with V in 36-72 V and V out +/-135 V:  Flyback with Vin 36-72 V and Vout +/135 V. The output current is 0.15 A with 20.25 W of output power. (added 3/05)

High Efficiency Isolated Flyback Supply Without Optoisolator:  DN1011  Design Notes (Linear Technology)  (app note added 1/06)

Hot Swap Push-Pull Sync. Buck Negative Flyback Dual Sync. Buck Reference Design:  Hot Swap, Push Pull, Sync. Buck, Negative Flyback, Dual Sync. Buck with Vin of -36 V to -72V. Vout of 8 V, 5 V, 3.3 V, 2.5 V and -5 V. The output power is 79.5 W.  (added 3/05)

HV91 Series: Designing High-Performance Flyback:  Supertex Semiconductors  (app note added 2/06)

Ignition Coil/Flyback Transformer Based High Voltage Generators:  This page gives my thoughts on how to use a car ignition coil or Flyback transformer as a high voltage generator. The objective is to produce as high a voltage as possible, with as high a power throughput as possible. (added 4/02)

Isolated Flyback Converter Regulates Without an Optocoupler:  DN260  Design Notes (Linear Technology) (app note added 1/06)

Line Output/Flyback Transformer tester:  (circuit / schematic design added 7/06)

LM2577 Three Output, Isolated Flyback Regulator:  National Semiconductor Application Note   (app note added 2/06)

Low-Cost Multiple Output Flyback Converter for I/O Cards:  National Semiconductor Application Note   (app note added 6/06)

LTC1871 No Rsense Controller is Small and Efficient in Boost Flyback and Sepic Applications:  DN296  Design Notes (Linear Technology) (app note added 1/06)

Negative Flyback with V in 12 V and V out-5 V:  This reference design is for a -12V at 1A Negative Flyback Converter. The UC3572 converts a positive input voltage to a regulated negative output voltage. The chip is optimized for use in a single inductor negative flyback switching converter employing an external PMOS switch.  (added 3/05)

Output Adjustable Flyback Converter:  (electronic circuit added 7/03)

Power over Ethernet: Sync Flyback Reference Design:  This reference design presents an alternative to the typical boost power regulator. A buck converter IC is used to generate a higher voltage needed by the white light LED power from a Ni-Cd battery. This circuit operates by turning the high switch on, connecting the battery voltage across the inductor. Once sufficient energy is stored in the inductor, the high side.... (added 6/06)

Powerlabs Flyback Driver:  Circuit design (added 01/05)

Quasiresonant Converter uses a Simple CMOS Ic:  04/15/04 EDN Design Ideas  /  (added 1/05)  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 create high di/dt, which is the main cause of noise. The converter in Figure 1 (pg 76) has a low noise level, because it slowly switches current on at nearly zero......

Simple High Efficiency Isolated Flyback Supply Without Optoisolator:  DN1011  Design Notes (Linear Technology)  (app note added 1/06)

Single Transistor Flyback Driver:  (electronic circuit added 7/03)

STLC3075 very Low single supply SLIC for wll application in fly-back configuration:  AN2132 Having at hand a copy of the device Data Sheet is essential for quicker and easier understanding of the content of this Application Note....  (app note added 6/06)

Synchronous Flyback Circuit Provides High Efficiency Conversion:  07/22/04 EDN Design Ideas  / (added 1/05)  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.

Transformer Design Consideration for off-line Flyback Converters Using Fairchild Power Switch (FPStm) / AN-4140:  Fairchild Application Notes / (app note added 6/06)

UCC3819 250-W Pfc Boost Follower Preregulator Design:  This is an application 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. (added 3/05)