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# Discontinuous Mode Flyback

14 Threads found on edaboard.com: Discontinuous Mode Flyback

## FlyBack Converter design Equations

hi What are the design equations for the calculation of fly back Converter Peak Primary Current Primary Average Current Priamry RMS Current How it can be ensured that converter is working in discontinuous mode at all conditions of load?

## What is disadvantage of frequency jittering?

I have worked with VIPER17 and the jitter may cause a little output voltage ripple (at the jittering frequency) if the control loop is not properly adjusted. This happens in a flyback converter operating in discontinuous mode, since the output power depends on switching frequency and therefore the control loop has to compensate this (...)

## Flyback in DCM vs CCM?

discontinuous mode means you won't have a RHP zero, or any subharmonic oscillation in current mode control. Also you get input power limiting via volt-time product limiting.

## Incorrect information about CCM vs DCM offline flyback?

Hello, Please may I first state: CCM = continuous conduction mode DCM = discontinuous conduction mode do you believe some points made in "Puzzler 3" on the website are incorrect or incomplete or at least biased unfairly in favour of CCM? Puzzler 3:- For e

## flyback transformer noise

I made a DC-DC flyback converter and it has a variable output voltage. But at some of the voltage range the transformer makes loud noise. The switching frequency is 50khz. it work in discontinuous mode and I use UC3842 for controller. I guess that I have oscillation at feedback loop. I check pin 1 of 3842 with scope. at normal state t

## Flyback converter-zero on right half plane

Hi , I need to design a flyback converter operating in discontinuous mode. Im planning to use UC3845 current mode IC. Input is 60-160V DC,output is 5V,500mA This is the Spec. Ive been hearing that in discontinuous mode there is no right half plane zero which makes the design (...)

## ringing in flyback SMPS

ringing tendency is less in case of flyback continuous modeI think it isn't generally. There are however different kinds of ringing. In discontinuous mode, the transformer main inductance is disconnected after the output current reaches zero. You have a rather high impedance resonance circuit then, that can show a low (...)

## power and inductor current relationship ?

A flyback converter can be operated in either discontinuous current mode (DCM) or continuous current mode (CCM). With the same output power, a converter in CCM exhibits smaller peak inductor currents than one in DCM. why ? what is the relationship , or say , formula , between power and inductor current?

## SMPS input power....RMS or average?

Hello, I am writing with regard to calculating the input power to an SMPS, -that is calculating the input power from the DC input voltage and current. The problem i have is For a continuous mode boost converter PFC, they use V(rms) * I(rms) ...but for say a discontinuous mode flyback, they use V(average)* (...)

## wide-mains off-line smps - help needed

I wish to design wide-mains, 40 Watt, off-line smps for use in UK or USA. it will be flyback. i will design it so that in UK, on full load it is in Transition mode (ie, borderline between continuous and discontinuous mode) However, when it is plugged in in USA, on full load it will go into continuous (...)

## difference between continuos and discontinuous

hi in the flyback converter in the discontinuous mode there is a lower transient output voltage spike(in the comparison with continuous mode)to sudden changes in load current or output voltage.what is the reason of?

## ac simulation of DC/DC converter

SMPS SPICE Books: 1.Bello, "Circuit Simulation of Switching Regulators Using SPICE," 1993 Buck, boost and flyback averaged power stage models for continuous and discontinuous conduction. Voltage and current mode control. SG1524, 1525 and 1526 PWM controller models. (...)

## Question: continuous and discontinuous-conduction mode

They are talking about the current in the output inductor or transformer. In the discontinuous mode the output capacitor supplies the load current when the inductor current is zero.

## What are pratical limits of flyblack input voltage range?

you must consider wheither you are operating in continuous or discontinuous mode. cause this changes some of the math formulas involved. your current controls when flyback transfers from continuous to discontinuous. normally this is not a desired action, but it can be controlled if done properly. anyways, as your input (...)