Voltage Regulation on PKS606PN design

only thing you can do is use TL431/OPTO.....if you have money use very fast opto...........also u never get good reg when you regulate two windings like that.
Continuous conduction mode gives better regulation when used with multiple outputs.

give biggest feedback weighting to highest power output

How much your outputs change and under which load conditions. The worst case for regulation is when you have one output fully loaded and the other output un load. During this condition, the unloaded output will tend to go higher. Sometimes it is possible to fix this condition by adding a pre-load to the outputs. You may try to preload one (or the two) output to fix the problem. Thank you. PI-Worf

I am changing the design to resemble the last sample in the AN-22 application note and will provide feedback on that.

I had phone call about this, but the email address I probably wrote down wrong.

Have attached the transformer design file with the .DOC extension added.

Thanks,
Mike

hello Mike, I called you this morning. If you are changing the design, let us know what happen with your new design.
thnnk you
PI-Worf

I must have written your email address down wrong. As soon as I get the modifications installed I will send the new schematic and voltage levels.

Thanks,
Mike

I have attached the schematic with the changes to the origional design. Please notice that R10 is shown but not connected. When connecting this to the circuit, the supply will not come up to voltage, but seems to go into current limit with only a light (<400ma) load.

The 12VDC output will have a load of 1.5A for 250ms only occasionally and for the rest of the time the only load will be the proload resistor (400 ohms). The 6.5VDC output will have a load of 500ma most of the time with peak of around 15W.

With max load applied to the 6.5VDC output, it drops to 6.0VDC and the 12VDC output rises to 13VDC. This isn't a concern because it's for driving a relay and will not be active at the same time.

The 6.5VDC output rises to 6.8VDC with the 12VDC output loaded to 1.5A. I think this is well in the range that can be tolerated.

If you have any suggestions on how to further refine the feedbackc let me know.

Thanks,
Mike