I am looking for information/circuit examples about boost conversion.
I want to be able to boost 5v from USB all the way up to 25v in small steps and have it s/w controlled by an MCU. What is the best/simplest way to implement this ?
-- Always boost to 25v and then regulate it down with a DAC controlled transistor ?
-- Control the boost circuit somehow by outputting different frequency from the MCU?
-- Other ways of achieving same goal ?
I would also like to know how to use the ADC to measure current to implement a shut off if a certain current level is exceeded. Would I do that by measure voltage drop over a shunt ?
I am working an an universal device programmer and this is the part I am getting stuck at generating the VPP