I order stuff from www.mouser.com and get it in 2-3 days
Go to maxim's homepage and do a search for the MAX774...-5v at 1 Amp inverting switching regulator. Page 10 of the data sheets has some usable schematics, although some of the parts may be a bit hard to find...but then every power supply I have looked at has had had hard to source parts...
p.s also look at www.sproggy for other ideas
[This message has been edited by AussieGuy (edited 03-06-2001).]
Originally posted by AussieGuy:
Go to maxim's homepage and do a search for the MAX774...-5v at 1 Amp inverting switching regulator. Page 10 of the data sheets has some usable schematics, </STRONG>
Im planning on using this chip for my -5V but page 10 shows 3 schematics. Which one should I use? something about bootstrapping or not. Heres the link to the schematics: http://pdfserv.maxim-ic.com/arpdf/MAX774-MAX776.pdf
thanks in advance.
PS I cant get -5V from my power supply as im using a laptop
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Use the non-bootstrapped configuration of figure 4. The note says to use the non-bootstrapped configuration for large input to output voltage differentials. It mentions a maximum input to output voltage differential of 21 volts. This means that the difference between the input and output voltages cannot be greater than 21 volts. With 12 volts in and -5 volts out, the differential is 17 volts. Use figure 4.