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QuattroRS4
01-14-2008, 04:19 AM
Hello All,
·········· Will be incorporating this little beauty in a trial application shortly . Specs are fairly impressive.
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,P36533
I will update you all when trial is underway. Should make a nice Prop·supply .. Look at·max Vin and O/P can be adjusted down to 800mV. Nice current ratings too..·Will be suitable for Prop2 @1.8v also ..!!

While I was researching alternative components for existing controllers - I came across an alternative for the commomly available TLP521-4 Optocoupler - with pretty much identical specs. for half the price .. Just thought I'd pass on the details.. http://www.avagotech.com/products/acpl-847-000e/

Regards,
·········· John Twomey


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'Necessity is the mother of invention'

deSilva
01-14-2008, 04:47 AM
As I understand it, the external parts are exactly doubled, so what is left is that you have one 16-pin IC rather than 2 8-pin ICs. 1.4A without heat sink however is impressive..

QuattroRS4
01-14-2008, 04:52 AM
Desilva - the current capabilities are not the only factor that impressed me .. The input voltage range did also .. Plus it is ideally suited to industrial and automotive apps. The flexibility,efficiency and Power capabilities for the extra few components make it really worth while IMO..

John Twomey

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'Necessity is the mother of invention'

deSilva
01-14-2008, 04:55 AM
If you think so..

QuattroRS4
01-14-2008, 04:56 AM
I do !

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'Necessity is the mother of invention'

mosquito56
01-14-2008, 01:13 PM
Please continue your reports on this little toy. Multi-voltage input and 1.4 amp could come in very handy. I look forward to you report

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Hmm, "If you can't say something nice, don't say anything at all"

······· "No such thing as a dumb question" unless it's on the internet
········"What happens in Vegas ends up on the Internet"

Technologically challenged individual, Please have pity.

James Long
01-14-2008, 02:45 PM
mosquito56 said...
Please continue your reports on this little toy. Multi-voltage input and 1.4 amp could come in very handy. I look forward to you report


The wide input range is not the best part. The chip will output 2 voltages (3.3 and 5 volts for example) which are selectable with the passives. That is 1.4A on each output.

It really is a nice chip if you need the different voltages. I'm redesigning with it right now. I have a board that has two voltages needed and an automotive voltage supply. It does require a good number of passives to function to it parameters, but I think it will reduce the real estate demand on my board.

Should check on the datasheet if you get the time.

James L

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James L

Partner/Designer
Lil Brother LLC (SMT Assembly Services)

mosquito56
01-14-2008, 03:33 PM
·I looked at the datasheet briefly and noticed the dual output feature. I am thinking 12v in, 9 and 6.5 out. 6.5 would feed the 5v reg to prop, 9 for misc lights and other goodies, 5v for other semiconductors and 3.3 for prop. Nice selection for anything that may pop up.
·Depending on the "good number of passives" and the "price", I look forward to the report.

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Hmm, "If you can't say something nice, don't say anything at all"

······· "No such thing as a dumb question" unless it's on the internet
········"What happens in Vegas ends up on the Internet"

Technologically challenged individual, Please have pity.

QuattroRS4
01-14-2008, 05:33 PM
mosquito56,
The unit price is approx US$5 .. obviously the passives are extra .. I will be using this for an industrial control board with 24v DC I/P - board incorporates an embedded WI - ethernet module which draws approx. 400mA @3.3v .. has a few hefty 5v I.C's also .. so for its size it packs a punch ! .. Overall size is neat .. its true that there are quite a few·additional passives but overall footprint should be small and for the output power capabilities and wide input voltage range it's as good as I have seen for a while ..

Regards,
John Twomey

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'Necessity is the mother of invention'

Post Edited (QuattroRS4) : 1/14/2008 9:45:44 AM GMT

Fred Hawkins
01-14-2008, 07:29 PM
Efficiency for 3.3v looks low to me -- but what's the efficiency in the usual 9v battery, 5v reg, 3.3 reg setup?

OzStamp
01-14-2008, 07:55 PM
Hi John.
That looks like a new chip.. but not easy to work with tiny..
Are you familar with the LM2575_T (5V and 3.3 V available).. series from National and other similar vendors..??

Std TO-220 type package 5 pin ..

Ron Mel oz

deSilva
01-15-2008, 02:43 AM
@Fred
Efficiency for most available 3 Volt step-down converters is generally not so good (some 60%), efficiency for 1.8V converters even worse. For 5V it is some 80%.

Stabilizng with a linear regulator from a 9V battery is around 30%

That is why I (we) use 4xAA cells with nominally 4.8 Volts. That does fine for faking 5V, has 5 fold capacity of a 9V battery and also 60% efficiency http://forums.parallax.com/images/smilies/smile.gif

QuattroRS4
01-15-2008, 07:00 AM
Ron - Yeah its pretty new .. and small ! I am aware of those regulators but I kind of liked this I.C..


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'Necessity is the mother of invention'

Fred Hawkins
01-16-2008, 12:38 AM
deSilva said...

That is why I (we) use 4xAA cells with nominally 4.8 Volts. That does fine for faking 5V, has 5 fold capacity of a 9V battery and also 60% efficiency http://forums.parallax.com/images/smilies/smile.gif
nihm cells, yes?

QuattroRS4
01-16-2008, 01:03 AM
Fred - I presume you meant NiMH cells ... typo ?

John T

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'Necessity is the mother of invention'

Post Edited (QuattroRS4) : 1/15/2008 7:20:49 PM GMT

Fred Hawkins
01-16-2008, 02:28 AM
just LaZY

QuattroRS4
01-16-2008, 03:16 AM
Fred ..Just having a Laugh ..was referring to the orientation·nihm as opposed HiMH·- JT

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'Necessity is the mother of invention'

Post Edited (QuattroRS4) : 1/15/2008 7:21:39 PM GMT

Fred Hawkins
01-16-2008, 05:28 AM
yikes. nOT mERELY lAzy BUT DYSLEXIC TOO

deSilva
01-16-2008, 06:00 AM
@Fred: There is always a lot of discussion going on inside and outside the web wrt NiCd, NiHM, and Lithium. We had some threads here too..
There is much negative propagande for cadmium, sure its poisonious, but you can recycle it if you want. We have very strict laws here in Germany. It is not so obvious what to do with old NiMH cells...
Both habe memory effects when mishandled! NiCd has better price/capacity ratio, but NiMH sports higher absolute capacity (though for a much higher price!) There is a new generation of low-leakage NiHM cells for a still higher price...

As a lithium cell produces around charming 3.7 V there are some possibilities to use them too - and I do! - but the ubiquitions 1.2V AA ( or AAA) cells have unmatched advantages of handling, availability, and relative pricing. For the hobbyist there are few sitations where their generic 5.2 to 4.7 Volts cannot be used for any required nominal 5V...

Fred Hawkins
01-16-2008, 10:28 PM
NiHM AA's have a signal advantage for me -- I own at least 16 of them. And a four cell holder.