This is to turn on MOSFETs that operate above 5.2V supply of the Boost regulator. I have followed a forward converter guidance roughly in one of the application notes, but I have not used a transformer but placed a high value resistor in the voltage doubler output. How much can I reduce the resistor values R6 and R69 without disrupt the operating of the SPV1040? Reducing them to 1 to 10K would be good. The input is limited to 4.5V so that a diode is not required between LX and Vout.
The application is a generator start-up circuit for vintage/veteran car dynamo.
An Engineers Perspective: Vintage and Veteran Car dynamo power management
Thanks
