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Author Topic: MC34063ECD-TR How to wire it for 3.3v?  (Read 5062 times)

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Offline Bluestreak66Topic starter

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MC34063ECD-TR How to wire it for 3.3v?
« on: June 16, 2013, 01:44:21 am »
I'm trying to build up a 3.3v power supply and would like to use a MC34063ECD-TR the input will be 24vac half wave rectified and  I need 3.3v @ around 1 amp. I've looked at the data sheet and can't figure out how to size the components. The way I understand it is it uses a 1.25 volt internal reference and switches the output on if the feedback is below that and off if above? So I need to change resistor value accordingly correct? Also the inductor determines the efficiency and max output current correct? So how do i determine the value of that?  Those are the two things I'm struggling with. I'll put a link to the datasheet. I know there are several swithing regulators like this one and the all look to be the same to set up. This one seems to be the lowest cost solution that fits what I'm needing. Any help is appreciated Thanks

http://www.st.com/web/en/resource/technical/document/datasheet/CD00001232.pdf
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Offline c4757p

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Re: MC34063ECD-TR How to wire it for 3.3v?
« Reply #1 on: June 16, 2013, 01:47:23 am »
Have you watched Dave's video on this? He did a pretty good video on the MC34063.

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Offline mariush

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Re: MC34063ECD-TR How to wire it for 3.3v?
« Reply #2 on: June 16, 2013, 01:50:00 am »
There's also an online calculator that's pretty good : http://dics.voicecontrol.ro/tutorials/mc34063/
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Offline Bluestreak66Topic starter

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Re: MC34063ECD-TR How to wire it for 3.3v?
« Reply #3 on: June 16, 2013, 01:55:32 am »
Totally forgot about that ill give that another watch! mariush I've been looking for a calculator like that for the past hour you are awesome!
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Offline mariush

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Re: MC34063ECD-TR How to wire it for 3.3v?
« Reply #4 on: June 16, 2013, 02:02:42 am »
I guess your google-fu is horrible.

Google for "34063 calculator" or "mc34063 calculator" ...

MC34063A development aid
http://www.nomad.ee/micros/mc34063a/

MC34063 Universal Calculator   (open source software on Sourceforge)
http://sourceforge.net/projects/mc34063uc/

MC34063 Calculator Online > Step-Down, Step-Up, Inverter
http://www.bobtech.ro/tutoriale/componente-electronice/43-calculator-online-mc34063a-mc34063-step-down-step-up-inverter

MC34063 parameters calculator
http://ukpyr.narod.ru/calc_mc34063.htm

etc

Anyway, glad I could be of help.
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Offline Bluestreak66Topic starter

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Re: MC34063ECD-TR How to wire it for 3.3v?
« Reply #5 on: June 16, 2013, 02:33:50 am »
lol ya I was using the whole part number my bad  |O  I got all the numbers I needed. I'm laying out my board now. Thanks again!
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