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« on: January 19, 2010, 04:42:18 pm » |
Is there a simple low cost IC that i can use to triple my input voltage? I need to feed an IC 15v and would love not to have to have another PS or buy a DC-DC converter, if not ill buy the converter, im just a bit reluctant to spend the 15 bucks on what seems like a simple task.
I figured ide ask since ive seen doublers like the ADM660.
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SE USA
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« Reply #1 on: January 19, 2010, 04:46:47 pm » |
why take a higher external voltage (the arduino supply) run it tru a 5 volt regulator then boost it back up?
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Manchester (England England)
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« Reply #2 on: January 19, 2010, 05:30:28 pm » |
It is called a boost converter but it will cost you much more than 15 bucks.
The price depends on the current. What current do you need?
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« Reply #3 on: January 19, 2010, 06:55:26 pm » |
Im doing this cause im using an ad595 in the same circuit, and it needs to be feed exactly 15v in order to read past a certain temp. I would imagine it needs a minimal amount of current.
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Boston, MA
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« Reply #4 on: January 19, 2010, 06:57:53 pm » |
There is an application note for a voltage tripler at Maxim (AN297) It uses the MAX1683, (3) 10uF caps and a dual schotty. It is probably in the $5-$7 range.
The topology may work with the xx660 chips but I am not sure.
A couple notes -- the switched capacitor boost converters have limited current and
are unregulated. Also the voltage is 3 * VIN minus two diode drops (and whatever
regulator you add).
(* jcl *)
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Cumming, Ga
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« Reply #5 on: January 19, 2010, 07:24:42 pm » |
If you like to recyle old electronics (as I do) you can sometimes find a jem in the junk. I found a few TL497's in my junk box and they work great at getting 15V from 5V.
Actually, these nice chips are still available New from Mouser electronics (so I guess other vendors have them as well) Only $1.50 or so each. The only tricky component needed is a power inductor of the right value.
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Denver
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« Reply #6 on: January 19, 2010, 09:09:32 pm » |
Maybe a High-Side Power Supply - used for N-channel MOSFETs. I've used the MAX1822. http://datasheets.maxim-ic.com/en/ds/MAX1822.pdf |
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« Reply #7 on: January 20, 2010, 08:52:44 am » |
Ive decided on buying a doubler. After more research ive found that i dont need to measure over 1800f. Im gonna use the ADM660 that jluciani suggested in an earlier post. Thanks again guys.
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Boston, MA
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« Reply #8 on: January 20, 2010, 09:08:42 am » |
I think you are better off with a doubler. A lot of people make the x660 series doublers (and doublers in general). You only need two or three caps to get 50-100mA. The ADM660 is reasonable priced especially considering it is coming from a quality manufacturer like Analog Devices. (* jcl *) ------------------------------------ www: http://www.wiblocks.comtwitter: http://twitter.com/wiblocksblog: http://luciani.org |
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