"rickman" <spamgoeshere4@yahoo.com> wrote in message news:4058A0B3.E95C88A5@yahoo.com...> I find that I can do a much better search as some of the distis. I > normally start with Digikey and sometimes Mouser. Digikey is great as > they have pretty much everything in their data base categorized, so if > you do a search on a partial number or description, you don't just get a > million hits, you get a list of categories. Clicking on one gives you a > parametric selection guide that actually *means* something normally.I just tried a search "DC-DC converter" at DigiKey and indeed, I am Impressed. This selection database works like a charm. Thanks for pointing that one out to me. Meindert
Looking for DC/DC converter
Started by ●March 4, 2004
Reply by ●March 18, 20042004-03-18
Reply by ●March 18, 20042004-03-18
"Greg Neff" <greg@microsym.com> wrote in message news:8k3h501cnrd2ntvacvkjl97uuogpj2dr32@4ax.com...> On Wed, 17 Mar 2004 07:48:53 +0100, "Meindert Sprang" > <mhsprang@NOcustomSPAMware.nl> wrote: > > Not true. There are excellent BB 1W (DCP01) and 2W (DCP02) isolated > converters available in standard DIP and SO packages, and we use them > extensively. Unfortunately, they don't have the wide input range that > you are looking for in this application.Also, the dual output is not what I want. Most dual-output types ar +/- outputs. I need two independent 5V outputs, isolated from eachother too. So far, I could only find C&D that does that. Meindert
Reply by ●March 18, 20042004-03-18
,the dual output is not what I want. Most dual-output types ar +/-> outputs. I need two independent 5V outputs, isolated from eachother too.So> far, I could only find C&D that does that.- sounds like two converters and your done.
Reply by ●March 18, 20042004-03-18
On Thu, 18 Mar 2004 14:40:07 GMT, the renowned "Bobsprit" <Bobsprit@aol.com> wrote:>,the dual output is not what I want. Most dual-output types ar +/- >> outputs. I need two independent 5V outputs, isolated from eachother too. >So >> far, I could only find C&D that does that. > >- sounds like two converters and your done.Maybe build a non-isolated buck converter to regulate the input (stock magnetics) and put a couple of the B-B jobs on the output. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ●March 18, 20042004-03-18
"Bobsprit" <Bobsprit@aol.com> wrote in message news:bxi6c.11301$E8.2842421@news4.srv.hcvlny.cv.net...> ,the dual output is not what I want. Most dual-output types ar +/- > > outputs. I need two independent 5V outputs, isolated from eachother too. > So > > far, I could only find C&D that does that. > > - sounds like two converters and your done.Except that two converters are more than twice the price and consume twice the space. Meindert
Reply by ●March 18, 20042004-03-18
Meindert Sprang wrote:> > "Bobsprit" <Bobsprit@aol.com> wrote in message > news:bxi6c.11301$E8.2842421@news4.srv.hcvlny.cv.net... > > ,the dual output is not what I want. Most dual-output types ar +/- > > > outputs. I need two independent 5V outputs, isolated from eachother too. > > So > > > far, I could only find C&D that does that. > > > > - sounds like two converters and your done. > > Except that two converters are more than twice the price and consume twice > the space.You can't get something for nothing. If you want two isolated converters, there will not be much circuitry to share. So two separate units will not be much larger than one combined unit. More importantly, if you can't find a combined unit that meets your needs, you may have to use two separate units. -- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
Reply by ●March 18, 20042004-03-18
In article <4059E95B.66F19FDE@yahoo.com>
spamgoeshere4@yahoo.com "rickman" writes:
> Meindert Sprang wrote:
> >
> > "Bobsprit" <Bobsprit@aol.com> wrote in message
> > news:bxi6c.11301$E8.2842421@news4.srv.hcvlny.cv.net...
> > > ,the dual output is not what I want. Most dual-output types ar +/-
> > > > outputs. I need two independent 5V outputs, isolated from eachother too.
> > > So
> > > > far, I could only find C&D that does that.
> > >
> > > - sounds like two converters and your done.
> >
> > Except that two converters are more than twice the price and consume twice
> > the space.
>
> You can't get something for nothing. If you want two isolated
> converters, there will not be much circuitry to share. So two separate
> units will not be much larger than one combined unit. More importantly,
> if you can't find a combined unit that meets your needs, you may have to
> use two separate units.
Alternatively, he could do his own if he can manage to wind his own
transformer. I often need several isolated DC supplies so I just wind
up a transformer with the requisite number of secondaries and configure
a simple chopper to drive it.
--
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Paul E. Bennett ....................<email://peb@amleth.demon.co.uk>
Forth based HIDECS Consultancy .....<http://www.amleth.demon.co.uk/>
Mob: +44 (0)7811-639972 .........NOW AVAILABLE:- HIDECS COURSE......
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Reply by ●March 19, 20042004-03-19
""Paul E. Bennett"" <peb@amleth.demon.co.uk> wrote in message news:1079656094snz@amleth.demon.co.uk...> Alternatively, he could do his own if he can manage to wind his own > transformer. I often need several isolated DC supplies so I just wind > up a transformer with the requisite number of secondaries and configure > a simple chopper to drive it.I agree. But not feasible for regular production, but in quantities that do not justify have a transformer produced for me. That's the reason I was looking for an off-the-shelf product. What strikes me most is that I think there are a lot of products or equipment in the market that could use a wide-intput converter (8-30V) and have two isolated outputs. About every Modbus, Profibus or whateverBus device could use such a converter. Therefore I am surpised it does not exist as low power/low cost mass production product. Meindert
Reply by ●March 19, 20042004-03-19
On Fri, 19 Mar 2004 08:38:31 +0100, the renowned "Meindert Sprang" <mhsprang@NOcustomSPAMware.nl> wrote:>""Paul E. Bennett"" <peb@amleth.demon.co.uk> wrote in message >news:1079656094snz@amleth.demon.co.uk... >> Alternatively, he could do his own if he can manage to wind his own >> transformer. I often need several isolated DC supplies so I just wind >> up a transformer with the requisite number of secondaries and configure >> a simple chopper to drive it. > >I agree. But not feasible for regular production, but in quantities that do >not justify have a transformer produced for me. That's the reason I was >looking for an off-the-shelf product.Yes, you have an inconvenient quantity range.>What strikes me most is that I think there are a lot of products or >equipment in the market that could use a wide-intput converter (8-30V) and >have two isolated outputs. About every Modbus, Profibus or whateverBus >device could use such a converter. Therefore I am surpised it does not exist >as low power/low cost mass production product.Unfortunately, those are all rather low-volume process control applications. Thus, the function is available, just not so cheap and not so available. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ●March 19, 20042004-03-19
Spehro Pefhany wrote:> > On Fri, 19 Mar 2004 08:38:31 +0100, the renowned "Meindert Sprang" > <mhsprang@NOcustomSPAMware.nl> wrote: > > >""Paul E. Bennett"" <peb@amleth.demon.co.uk> wrote in message > >news:1079656094snz@amleth.demon.co.uk... > >> Alternatively, he could do his own if he can manage to wind his own > >> transformer. I often need several isolated DC supplies so I just wind > >> up a transformer with the requisite number of secondaries and configure > >> a simple chopper to drive it. > > > >I agree. But not feasible for regular production, but in quantities that do > >not justify have a transformer produced for me. That's the reason I was > >looking for an off-the-shelf product. > > Yes, you have an inconvenient quantity range.I would suggest taking a look at building your own. I worked on a board where one of the engineers spec'd a hand made choke/transformer. He wrote out assembly instructions and they had an assembler make them. Winding a transformer is not really that hard unless you are trying to make it very small. I know that several of the coil companies sell cores. -- Rick "rickman" Collins rick.collins@XYarius.com Ignore the reply address. To email me use the above address with the XY removed. Arius - A Signal Processing Solutions Company Specializing in DSP and FPGA design URL http://www.arius.com 4 King Ave 301-682-7772 Voice Frederick, MD 21701-3110 301-682-7666 FAX
