DC/DC convert 40V to 18V 2A max?

[JulioSilva]

40V to 18V/2A Converter

Hello,

Is there any simple circuit/IC that I can use to convert 40V to 18V 2A max?

Thanks,

JS

 

[Kripton2035]

40V to 18V/2A Converter

the max15020 from maxim does it ...

**broken link removed**

 

[JulioSilva]

Re: 40V to 18V/2A Converter

I need something more simple, and compact, like the LT1074, and not QFN package

Thanks

 

[Kripton2035]

40V to 18V/2A Converter

so why not use this lt1074 ????

you can also see here :
https://www.romanblack.com/smps/smps.htm

all the process making a step down smps is explained
you can adapt your own quite easy with simple components.

 

[JulioSilva]

Re: 40V to 18V/2A Converter

Because I only found it after I've writen the post! .

I think the LT1074 it's the best solution for me.

I'll also check out that link.

Thanks

 

[max0412]

Re: 40V to 18V/2A Converter

Another alternative could be the TPS40200DRG4 under 2 bucks. Not quite as simple as the linear tech part but they have a good data sheet with examples. Pretty wimpy gate drive for high power designs but all you need to do if it's not adequate is add a discrete totem.

I don't know where you are but here is a link where you can find the part and the data sheet.

https://canada.newark.com/texas-instruments/tps40200drg4/voltage-mode-contoller/dp/59M7211

You could also use a UC384X Series.

 

[cameo_2007]

40V to 18V/2A Converter

LM7818 ?

 

[Kripton2035]

40V to 18V/2A Converter

any 78xx will blow up instantly with such power to dissipe..you must use a smps, not a linear regulator.