myrra 74030 top 244 yn 24 V 1A

Hi hicham,
You may use our PI expertonline tool for you to optimize your design. The tool doesn't support topswitch gx family but you may use topswitch-hx family for computations purposes. Topswitch datasheet is also available in case you want to compare the changes between gx family and the hx family in the computations. (https://ac-dc.power.com/products/topswitch-family/topswitch-hx/).
https://piexpertonline.power.com/site/index
Regards,
Jedidiah

thanks for response,but which parameters i need to compare to change top switch hx with top switch gx
Regards,

Hi Hicham,
Are your component values exactly same as the ones shown in the reference schematic? If not then can you please share the actual schematic with us to know the component values and ratings?

Since this is a fixed transformer with the fixed inductance and number of turns, You can either use S1, S2 and S3 all in series or use S2 and S3 in series to get 24 V output. You need to adjust the feedback resistors values R6 and R8. You can validate your design in PI expert as suggested in previous reply by Jedidiah. The parameters you would need to input are input VAC range, Vo, Io, Input capacitor, feedback resistors, primary turns and then adjust the frequency to get the desired inductance matching with your transformer.

Regards,
PI-AP

hi thanks for the response;
so about the value its for 12 V.
i apply your recommendation ; volatge,Io,Vo,spire number,frequency.
thats what i found i think this transformer is like my transformer

what do you think but for that i changed KP

Hi Myrra,
I apologize for the delayed response. I couldn't understand your question about the Kp. Are you asking if the Kp value which you have chosen is valid to be used? If you meant to ask something else then please clarify.
PI-AP

Hi Hicham,

Can you please share your initial working schematic for the 12V/2A?

thanks

I will check to see if this transformer is actually suited for 24W power.

 I checked, and you actually need a TOP245 with the peak current reduced via the X pin to get 24W with this transformer. The spreadsheet shows the primary wire size to be slightly underrated for this output power, so the transformer might run a little warm. The design spreadsheet in PDF format is attached. I played with the transformer and TOPSwitch operating  parameters in the spreadsheet to match the turns and the primary inductance stated in the datasheet for the transformer. The core used in the transformer is actually similar to an EI25 transformer, so I used those core parameters in the spreadsheet.