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[SOLVED] Need Help with compensation with a variable supply

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russ

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Hi
I need some help with a compensation circuit for a variable power supply. The schematic is attached. I have not had any luck stabilizing my loop. A little explanation of the schematic.

I am using a 387Vdc input from a PFC converter. The schematic is for a 2 switch forward converter than can swing from 0-12V and 0-25A. The output inductor is 55uH and not 35uH as mentioned in the schematic. It also has a load share circuit whose output and output from the voltage divider is fed into a difference amplifier. The output from the difference amplifier is fed into the non inverting input U6(pin 7). A reference voltage that can be adjusted from 0-3V which in turn will adjust the output voltage. After this point I am having a problem adjusting my comp network with the right value so I have a stable loop over the whole range of output voltage.
Any help would be appreciated. I need the to know the method of calculating the voltage feedback control for a variable power supply. It is a 300W supply. I have read many articles but most deal with fixed output voltage.
If you need any more information, let me know.

Thanks in advance
 

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