Electronics > Projects, Designs, and Technical Stuff
I need help with with buck/flyback converther that does not use any controllers
NikKot:
I want to make a 32V to 16V converter but I do not have access to microcontrollers and other specialized components. I'm looking for for a circuit that only requires base components like pnp/npn transistors and etc. It doesn't have to be "beefy", I only need 100-200mA from it and I don't really care about efficiency. Any help and ideas or circuits will be appreciated. I'm using LTSpice so the ideal option would be some kind for circuit for that.
I'm sorry if this kind of topic isn't accepthed here, but it seems to me like a good place to post this.
upd. Forgot to mention that I have ferrite cores and I can wind them with the amount for turns needed.
Buriedcode:
The MC34063A is pretty widely available - even if you can't order form any distributor, they are so ubiquitous you can find them in almost any USB car cigarette power adapter. It's old, less than stellar efficiency, low frequency, but it does the job, and will work fine for your application.
It's Vmax is 40V so should be fine for 32V in, and should just about handle the output current.
T3sl4co1l:
This is a pretty reasonable approach, having current-mode behavior similar to UC3842, but with variable frequency as well. Multiple outputs are shown, you may not need those.
Tim
langwadt:
why a switcher if you don't care about efficiency ?
nigelwright7557:
my last smps was llc and used a pic micro.
was easy to develop and worked well.
even had oc detect.
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