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[SOLVED] Inverting DC/DC Converter

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kasamiko

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I'm looking for a design of inverting DC/DC converter using MC34063.

+12VDC IN and -12VDC OUT..at least 150mA.

I've seen some design but limited to 5VDC input only..


TIA
 

I'm not sure if that 5V limit with -12V out is inherent to the MC34063... I can't find anything in the datasheet that suggest the input on their example inverting converter can't go up to +12V.

One option is to use an external Pfet, driven by the MC34063 output as an open collector pull down. That should allow a much wider operating range.
 
Maximum 34063 I/O voltage differential is 40 V, there is a understandable reason, why the input voltage should be limited to 5 or 6 V, probably except for timing capacitor + inductor dimensioning specific. As in other applications, 34063 performance isn't mind blowing. Before trying to pimp it up with an external power stage, I would look for a more recent switcher chip.
 
Hi guys!

I'm stuck to MC34063 due to parts availability..:(

I'll try the ckt posted by tpetar and try to power it with 12VDC..

I'll post the result later..

BR
 

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