Voltage converter

Hi. Is there some ready made voltage converter that has this specs:

Input voltage : 24 V Output voltage 1 : 12V Output voltage 2 : 9V Output voltage 3 : 5V

To be more precise, i need three separated power outputs, not just one you can switch.

Regards !

Reply to
gm
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Amps from each???

The 9 may be uncommon so you might consider using a 7809 to make that one from the +12.

Tim

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Seven Transistor Labs 
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Reply to
Tim Williams

Isolation?

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John Larkin         Highland Technology, Inc 
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Reply to
John Larkin

Current?

Regulation?

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John Larkin         Highland Technology, Inc 
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Reply to
John Larkin

Depends a lot on the current ratings required. It should be possible to get +12 and +5 out in a single DC-DC converter, and, if you only needed 100mA or 200mA at 9V, just stick an LM7809 onto the 12V output.

Reply to
Spehro Pefhany

-------------- Upps , my mistake.

9V is for arduino - 0.5A SIM900 - 5V - ( max 1.5 A ) Siren - 12V - 1A

--------------------- Im end effect this should be based on this concept with some additional stuff, like siren, relay outputs etc..

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Reply to
gm

On a sunny day (Mon, 02 Feb 2015 19:22:02 +0100) it happened gm wrote in :

3 of these set you back 29$37
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for in case you buy a bigger arduino later...

I can confirm these modules work.

Reply to
Jan Panteltje

On a sunny day (Mon, 02 Feb 2015 19:22:02 +0100) it happened gm wrote in :

3 of these set you back 29$37
formatting link
for in case you buy a bigger arduino later...

I can confirm these modules work.

PS: The current sense shunt is in the -, so the - input is not directly connected to the - output. That can be a problem if you need the current limit. There is what seems a 10 mOhm (milli Ohm) resistor as current sense.

Reply to
Jan Panteltje

You could get three adjustable step-down switchmode modules to do this:

as long as you don't mind all of 'em having a common GND which is the negative terminal of your 24V source.

Reply to
whit3rd

Yep, I use some of them. $0.99 on ebay with free shipping

-Lasse

Reply to
Lasse Langwadt Christensen

The maximum current values that you have quoted are no problem at all. Each of the 780x series devices have a maximum continuous current rating of 1 Amp( please check the data sheet to verify) So, to tackle the higher current ratings, put 2 few of the regulators in parallel, so that each regulator handles a small fraction of the current. I have done this in the past, and it works fine.

Reply to
dakupoto

input voltage is 24V so, 15V*0.5A+19V*1.5A+12V*1A = 48W That'll need a big heatsink

-Lasse

Reply to
Lasse Langwadt Christensen

--------------- Thank you guys for your suggestions. My main goal is to have one board with three outputs, but i guess i can pull one additional output from some ready made buck converter...

Reply to
gm

---------------------- Guys, what do you think about this one ?

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It has no heat sink but the prize and dimension is reasonable. Three of those should do the catch. I hope only that thay can work 24/7 for at least 2 years.

Reply to
gm

On a sunny day (Tue, 03 Feb 2015 12:45:25 +0100) it happened gm wrote in :

12V 1A is 12 W, this thing is specified at 10 W maximu, scroll down page on ebay.
Reply to
Jan Panteltje

That should work. I don't see why you need 9V, the Arduino runs on 5V just connect it directly to 5v and don't use the regulator

-Lasse

Reply to
Lasse Langwadt Christensen

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