Circuit: DC DC boost converter
Chip: MC34063A
Requirements: 12V in, 18V 4A out, 70-80% efficiency
Goal: Because of the space, heat and EMI limitations, Simple, low cost, low profile, as few components as possible, conventional components will be used.
Use: A PSU from a PC will be used to power a small but powerful amplifier circuit that I'm designing.
Hi there all
Just starting to get involved into electronic engineering again after 2 years.
I have an 8 pin step-up inverting switching regulator but need some help calculating what values the components are suppose to be. I'm primarily work visually/pragmatically rather than numerically so any images/simulators would be useful.
I've primarily copied this from a variety of sources but need assistance to verify the relationship between curtain parts.
R1, R2: Current limiters for input voltage? don't think I need them.
R3, R4: no idea...
R5, R6: Feedback loop to control output voltage. (find out as I go along with some pots)
C2: timing capacitor, no idea how to determine or adjust the frequency of this.
D2: Is this really needed?
Attached image:
Edit: linked it to larger version
Chip: MC34063A
Requirements: 12V in, 18V 4A out, 70-80% efficiency
Goal: Because of the space, heat and EMI limitations, Simple, low cost, low profile, as few components as possible, conventional components will be used.
Use: A PSU from a PC will be used to power a small but powerful amplifier circuit that I'm designing.
Hi there all
Just starting to get involved into electronic engineering again after 2 years.
I have an 8 pin step-up inverting switching regulator but need some help calculating what values the components are suppose to be. I'm primarily work visually/pragmatically rather than numerically so any images/simulators would be useful.
I've primarily copied this from a variety of sources but need assistance to verify the relationship between curtain parts.
R1, R2: Current limiters for input voltage? don't think I need them.
R3, R4: no idea...
R5, R6: Feedback loop to control output voltage. (find out as I go along with some pots)
C2: timing capacitor, no idea how to determine or adjust the frequency of this.
D2: Is this really needed?
Attached image:
Edit: linked it to larger version
Last edited: