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Science Forum Index » Electronics - Design Forum » DC/DC 12/24v to 3.3 and 5v ?
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| ElderUberGeek |
 Posted: Wed Feb 14, 2007 5:36 am |
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I have a board that has components requiring both 5v and 3.3v supply.
The unit is supposed to be powered from a 12v or 24v battery.
Can anyone suggest such a dual output DC/DC converter? Needs to be PCB
mounted and of course inexpensive... (and should preferable handle
polarity changes in source).
Apart from the above, if BOM cost is to be minimized, would it be
better to build it from discretes or not worth the hassle?
Thanks |
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| martin griffith |
| Posted: Wed Feb 14, 2007 5:44 am |
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On 14 Feb 2007 01:36:02 -0800, in sci.electronics.design
"ElderUberGeek" <aribloch@gmail.com> wrote:
Quote: I have a board that has components requiring both 5v and 3.3v supply.
The unit is supposed to be powered from a 12v or 24v battery.
Can anyone suggest such a dual output DC/DC converter? Needs to be PCB
mounted and of course inexpensive... (and should preferable handle
polarity changes in source).
Apart from the above, if BOM cost is to be minimized, would it be
better to build it from discretes or not worth the hassle?
Thanks
how much current?
martin |
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| ElderUberGeek |
| Posted: Wed Feb 14, 2007 5:56 am |
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On Feb 14, 2:44 pm, martin griffith <mart_in_medina@ya___.es> wrote:
Quote:
how much current?
martin
Good question. I honestly don't know yet because it is still in design
stage. But no great power consumption (safely less then 500mA?) |
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| martin griffith |
| Posted: Wed Feb 14, 2007 6:32 am |
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| Roger Hamlett |
| Posted: Wed Feb 14, 2007 7:20 am |
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"ElderUberGeek" <aribloch@gmail.com> wrote in message
news:1171446986.519014.62890@v33g2000cwv.googlegroups.com...
Quote: On Feb 14, 2:44 pm, martin griffith <mart_in_medina@ya___.es> wrote:
how much current?
martin
Good question. I honestly don't know yet because it is still in design
stage. But no great power consumption (safely less then 500mA?)
On which rail though...
The answer depends massively on the relative loadings involved. One
solution (for instance), would be a chopper supply delivering 5v, and a
LDO, delivering 3.3. This is likely to be significantly cheaper than a
dual output chopper, and if the 3.3v current is relatively low, losses
will still be fairly small.
Best Wishes |
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| Guest |
| Posted: Wed Feb 14, 2007 7:52 am |
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On Feb 14, 2:36 pm, "ElderUberGeek" <aribl...@gmail.com> wrote:
Quote: I have a board that has components requiring both 5v and 3.3v supply.
The unit is supposed to be powered from a 12v or 24v battery.
Can anyone suggest such a dual output DC/DC converter? Needs to be PCB
mounted and of course inexpensive... (and should preferable handle
polarity changes in source).
Apart from the above, if BOM cost is to be minimized, would it be
better to build it from discretes or not worth the hassle?
Thanks
Check this report at
http://www.emittsol.com/section/market-analysis/ma100002.html
NSR |
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| Riscy |
| Posted: Fri Feb 16, 2007 1:45 am |
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On Feb 14, 9:44 am, martin griffith <mart_in_medina@ya___.es> wrote:
Quote: On 14 Feb 2007 01:36:02 -0800, insci.electronics.design
"ElderUberGeek" <aribl...@gmail.com> wrote:
I have a board that has components requiring both 5v and 3.3v supply.
The unit is supposed to be powered from a 12v or 24v battery.
Can anyone suggest such a dual output DC/DC converter? Needs to be PCB
mounted and of course inexpensive... (and should preferable handle
polarity changes in source).
Apart from the above, if BOM cost is to be minimized, would it be
better to build it from discretes or not worth the hassle?
Thanks
how much current?
martin
There is ton of DC/DC in (USA):-Newark, Digikey, (UK):- RS and Farnell
components catalogue, visit website and order parts. Traco version is
cheapest but not the best product. Beware some output are regulated
and some are not. |
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