Hi Dragon @ hec
Found a really cool chip wanted you to look at it and tell me what you think could do everything your pwm does and some more with the right app.. I'm interested to see what you think .
Dan
http://focus.ti.com/lit/ds/symlink/tps54620.pdf
Thank you for the comment,traderdan.
There is a problem mounted upper some though it is introductory IC.
1.Processing of feedback circuitry (VSENSE).
It is easy if it is a constant voltage circuit, and cannot adjust this part for the chopper control.
It seems that it oscillates along with the change of the output voltage, and it doesn't operate normally.
It is necessary to use the circuit that can be adjusted without using feedback from the output.
2.Frequency.
My circuit assumes about 100Hz though operation by 1.6MHz is assumed from 200KHz in this data sheet.
3.Allowed current.
Ten times or more the current actually thrown are ideals in ratings recommended by power FET though the maximum current is 6A in this IC.
Because a large current of 2A or 4A flows in actual MOD, the possibility of damaging it because of generation of heat etc. is thought in this IC.
Though there only haves to be IC that can clear the above-mentioned.