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Nice Power Supply IC and other .. — Parallax Forums

Nice Power Supply IC and other ..

QuattroRS4QuattroRS4 Posts: 916
edited 2008-01-16 14:28 in Propeller 1
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'

Comments

  • deSilvadeSilva Posts: 2,967
    edited 2008-01-13 20:47
    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..
  • QuattroRS4QuattroRS4 Posts: 916
    edited 2008-01-13 20:52
    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'
  • deSilvadeSilva Posts: 2,967
    edited 2008-01-13 20:55
    If you think so..
  • QuattroRS4QuattroRS4 Posts: 916
    edited 2008-01-13 20:56
    I do !

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    'Necessity is the mother of invention'
  • mosquito56mosquito56 Posts: 387
    edited 2008-01-14 05:13
    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 LongJames Long Posts: 1,181
    edited 2008-01-14 06:45
    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)
  • mosquito56mosquito56 Posts: 387
    edited 2008-01-14 07:33
    ·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.
  • QuattroRS4QuattroRS4 Posts: 916
    edited 2008-01-14 09:33
    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 HawkinsFred Hawkins Posts: 997
    edited 2008-01-14 11:29
    Efficiency for 3.3v looks low to me -- but what's the efficiency in the usual 9v battery, 5v reg, 3.3 reg setup?
  • OzStampOzStamp Posts: 377
    edited 2008-01-14 11:55
    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
  • deSilvadeSilva Posts: 2,967
    edited 2008-01-14 18:43
    @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 smile.gif
  • QuattroRS4QuattroRS4 Posts: 916
    edited 2008-01-14 23:00
    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 HawkinsFred Hawkins Posts: 997
    edited 2008-01-15 16:38
    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 smile.gif
    nihm cells, yes?
  • QuattroRS4QuattroRS4 Posts: 916
    edited 2008-01-15 17:03
    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 HawkinsFred Hawkins Posts: 997
    edited 2008-01-15 18:28
    just LaZY
  • QuattroRS4QuattroRS4 Posts: 916
    edited 2008-01-15 19:16
    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 HawkinsFred Hawkins Posts: 997
    edited 2008-01-15 21:28
    yikes. nOT mERELY lAzy BUT DYSLEXIC TOO
  • deSilvadeSilva Posts: 2,967
    edited 2008-01-15 22:00
    @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 HawkinsFred Hawkins Posts: 997
    edited 2008-01-16 14:28
    NiHM AA's have a signal advantage for me -- I own at least 16 of them. And a four cell holder.
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