12V to about 7VDC, with 590mApk from Vbat and 100kHz clock (Ct=330pF).
First Start Clock by closing bottom middle switch. Then turn on Feed Back by opening lower right switch. Other switches are for loading and bias near operating point.
Note: simulation crashes with large output capacitance, and at regulation. I think a Hysteresis setting for the op-amp may help.
http://epccs.org/indexes/Board/BUK01/
