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Re: Flback converter instability

 

Hello Rick,
Thanks, But i have connected the ground on the R285 to R295 resistors. Which is ground. Do you think there has to be some big resistor at the return path? say 100K since the input and the output side will have a common grounds and as i said it will short the return path?

Do you have any other source or database which can give me the esr of the caps i am using.
SInce i know these will contribute a lot to the instability.

another thing i want to know is " i have used the inductor as a flyback transf and want to know if the series resistance is calculated by the ltspice tool on its own"
i have given the direct values of 0.045Ohm what is given in the datasheet. What actually is seen by the coil is based on the connectivity. i.e parallel or series etc.., Will lt tool calculate on own since the coil craft vendor told me the LT tool will do. I just wanted to clarify once with you.

What are the other values/components which affect the stability of the flyback?
Should i try to do something with the comp pin(values) of the LT1241 device?

Ple Help.
Thanks,
Yoga

--- In LTspice@..., "sawreyrw" <sawreyrw@...> wrote:



--- In LTspice@..., "yogasmitha" <amba_200@> wrote:

Also, I have saved the .asc file in database for your reference which i have been using/trying to modify :flyback_nom.asc

--- In LTspice@..., "yogasmitha" <amba_200@> wrote:



--- In LTspice@..., "imbvlad" <imbvlad@> wrote:

Hello

You may want to try the other Yahoo group, "switchmode", they may have the answers you're looking for.


Good luck,
Vlad

Hi,
i was thinking that the main component what i have used is of LT and so this group should be aiding me.

Thanks
Yoga
Yoga,

You are missing a ground on the bottom half of your circuit. Here are some other comments:
1. You could 'clean up' your circuit by combining all the parallel caps and series resistors.
2. You don't need any caps in parallel with the DC voltage sources that have zero resistance.
3. Your current pulses aren't going to work right, because the sum of the various times exceeds the period.

Rick
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