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Posted

hello all,
i need 5v supply from my vehicle 12v battery.i know i can use 7805 but the problem is my circuit drives 20 LEDs continuously which roughly needs more than 400ma of current(over all).and the area is so conjusted i can't mount a big heat sink.
so can i use dc-dc converter for this purpose.
which chip is best for automotive project (if it is from MAXIM i can order a sample  ::) )
thanks


Posted

Here is another possible solution:

http://datasheets.maxim-ic.com/en/ds/MAX724-MAX726.pdf

High current, high efficiency, no heatsink, low part count, free samples and no fuzz! ;)

Posted

Here is another possible solution:

http://datasheets.maxim-ic.com/en/ds/MAX724-MAX726.pdf

High current, high efficiency, no heatsink, low part count, free samples and no fuzz! ;)


yes i saw those.but no samples for these chips  :(
any other maxim chips.
@hotwaterwizard
thanks i'll try these too
Posted

If I got it right here you need less than 500mA and this should be fine with almost no heatsink at all. If you fit it in a metal box just bolt it to the box and you’ll be fine. The tab of the MXL1074CT-SL is common ground so you don’t need any insulation for it if you don’t want to. (I presume your bike has negative ground connected to the frame)!?

Posted

or you could just use an LM323 Regulator 5 volts 3 amps


Can I ask something about that? Does the output current of 3 amps (or 1.5 amps for LM117) depend on the input current or it is provided even if the input current is less?
  • 1 month later...
Posted

if you can accomodate more parts go for MC34063C, the datasheet you may study. of late there are 4 pin swichable regulators providing for economical space saving and efficent ones. perhaps nationa semi has few of them.

for all linear methods you will have to loose energy acroos the set up.


sarma

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