Tool/software:
Hi,
I designed a flyback converter utilizing the LM5156 with the following specifications:
- Input Voltage: 22-36V
- Output Voltage: Up to 125V (regulated with current injection)
- Maximum Output Power: 125W
I've encountered an issue when attempting to increase the output current.
At a certain point (around 6A), the primary winding current begins to flatten out.
I've experimented with different homemade transformers, but the results have been consistent.
Specifically, I tried using 20µH and 10µH transformers with a turns ratio of 1:1.5, employing ferrite core materials 61 and 67.
Attached is an image illustrating the problem:
- CH1: MOSFET Gate
- CH2: Secondary Side Transformer Voltage
- CH3: Primary Side Transformer Voltage
- CH4: Primary Side Current
I would appreciate any insights or suggestions you may have.
Thank you