Closed loop flyback converter

Thread Starter

Adaweee

Joined Apr 17, 2023
11
Hello and good day,
i was working on my project on led driver using flyback converter. I was using LT1243 as my PWM, when i run my simulation, the expected result for my flyback converter is not shown. I was working on A Design of 9W Closed Loop Flyback Converter with 9.9V, 350mA.

1681749921749.png
 

Ian0

Joined Aug 7, 2020
9,671
Flyback seems like an odd choice to get from 12V to 9V, buck would be a lot simpler!
You could always delete C1, R2 and D2, and connect a capacitor between the two non-dot ends of the transformer, and then you would have a SEPIC.
 

Thread Starter

Adaweee

Joined Apr 17, 2023
11
Flyback seems like an odd choice to get from 12V to 9V, buck would be a lot simpler!
You could always delete C1, R2 and D2, and connect a capacitor between the two non-dot ends of the transformer, and then you would have a SEPIC.
yes i know for the buck converter, but my supervisor said, i need to work on flyback converter for this project
 

Thread Starter

Adaweee

Joined Apr 17, 2023
11
Post you .asc file.

You circuit has some odd connections as compared to this demo circuit from Analog Devices:

View attachment 292365
actually, i try to replicate my benchmark paper, this is their circuit;
this paper works on flyback converter. They Design of 3.3W Closed Loop Flyback Converter
with 3.3V, 1A Output for Low Voltage Applications. As for my project, i tried to design a led driver circuit with a closed loop flyback converter with a 3x1W high power led (white) in series
 

Attachments

StefanZe

Joined Nov 6, 2019
191
The Rt/Ct pin seems to be connected to the wrong RC components. I think it should be connected to R8 and C4 and the sense pin should be connected to R7 and C3
 
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