A fuzzy area I want to clear up on the MC34063AP is Duty Cycle.
In the MC34063AP datasheet, toff an ton are a result of 1 / f, which is obvious.
toff is calculated by: 1 / f / ton / toff + 1
ton is calculated by: ( 1 / f ) - toff
The timing Capacitor CT is given by: 4.0 x 10 to -5 ton
What I can not find, and seems there is no logical direction, is what component, Resistor Capacitor or Inductor determines the Duty Cycle.
If, for example, I had an existing driver, and I wanted to modify the duty cycle, how would I go about it?
Configuration: Step Down