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'[EE]:: SMPS plugins for LM78xx regulators'
2011\03\24@082458 by RussellMc

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Plug into std 3 terminal regulator TO220 pinout.
Similar power specs.
Cost unknown (when you find out come back and tell me).

http://www.micropowerdirect.com/PDF%20Files/Datasheets/Noniso/SRM7810-Datasheet.pdf

Nothing you couldn't do yourself but it's nu\ice to have it done for you.

90% + efficiency across a lot of the envelope.

5V and 3v3 out versions.

SMD DIP like 1 Watt smps


http://www.micropowerdirect.com/PDF%20Files/Datasheets/DCDC/LF/LCP100E-Datasheet.pdf



_________________

These converters are specifically designed to replace inefficient linear
regulators (LM78xx type) for board level applications that require miniature
size, high efficiency, high reliability and low cost.



Two standard models operate over an input range of 4.75 to 20 VDC, providing
tightly regulated outputs of 3.3 or 5 VDC. Output current for all models is
1A. Standard features include efficiency as high as 93%, very low noise
operation and tight line/load regulation. All models feature over load
protection, over temperature protection and continuous short circuit
protection. The MTBF for both models (per MIL HDBK 217F) is greater than 2.0
Mhours.



The SRM7810 family is packaged in a miniature, Single-Inline-Package (SIP)
case that is only 0.45
x 0.30 x 0.40 inches. They feature an industry standard pin-out and all case
materials meet UL94-VO.
Each model is specified for operation over the wide operating temperature
range of -40°C to +70°C with no derating or heat sinking required (derated
operation to +85°C is specified). Cooling is by free-air convection.



The SRM7810 series offers an ideal combination of miniature size, robust
performance and low cost. They are an ideal replacement for inefficient
linear POL regulators (which typically need heat sinking and/or airflow),
providing reliable operation over a wide operating temperature range without
any need of external heat sinking or board layout changes. Applications
would include industrial process systems, remote or battery backed systems,
test/lab instrumentation, robotic systems and board level power distribution
subsystems.



*MicroPower Direct** *products are designed to provide long, reliable field
life. Considerable attention is given to the proper selection, derating, and
layout of all circuit components. In addition, extensive reliability
screening is also performed on all modules as a routine part of our
production process

2011\03\24@083426 by Josh Koffman

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On Thu, Mar 24, 2011 at 8:24 AM, RussellMc <spam_OUTapptechnzTakeThisOuTspamgmail.com> wrote:
> Plug into std 3 terminal regulator TO220 pinout.
> Similar power specs.
> Cost unknown (when you find out come back and tell me).

I've used the V-Infinity V78XX-500 series before (specifically the
v7805), and they work quite nicely.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=102-1709-ND

CAD$6.12 each isn't cheap, but they run up to 32V in and don't need a
heatsink. For the few one off applications I've hit they're extremely
useful. They make a 3.3V version too
(http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=102-1708-ND)
but it only goes up to 28Vin.

There's also a 1A version available.

Josh
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2011\03\24@094201 by PICdude

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A few companies have done this before.  Though generally touted as  78xx drop-in replacements, they're really not, as they require  relatively large external caps.  I've built a few different versions  on my own in the past, and they were truer drop-in replacements  (current was limited to 0.5A to 0.75A though).  IIRC cost was $4-5/ea  in hundreds.

Cheers,
-Neil.


Quoting RussellMc <.....apptechnzKILLspamspam@spam@gmail.com>:

{Quote hidden}

>

2011\03\24@102118 by Adam Field

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On Thu, Mar 24, 2011 at 9:41 AM, PICdude <picdude3spamKILLspamnarwani.org> wrote:
> A few companies have done this before.  Though generally touted as
> 78xx drop-in replacements, they're really not, as they require
> relatively large external caps.  I've built a few different versions
> on my own in the past, and they were truer drop-in replacements
> (current was limited to 0.5A to 0.75A though).  IIRC cost was $4-5/ea
> in hundreds.
>

I used this part from Murata recently:

http://www.murata-ps.com/data/meters/dms-78xxsr.pdf

Doesn't require any capacitance. And I was able to run a 3.3V line
from the 20V available without heatsinking or burning off 16V. I'm
pretty sure I got a few for under $5 each, but now the price on Mouser
is close to $10. Murata was also partially affected by the disasters
in Japan too though.

2011\03\24@113804 by Kerry Wentworth

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Thanks for the heads up.  I designed a board years ago, using a PowerTrends 78SR105, and am now being asked to redo it.  TI bought PowerTrends, and the 78SR105 has gone from ~$10 to ~27!  I was considering doing a discrete (relatively) switcher, but now I see that OKI makes a 78SR-5 good for 1.5A, available from Digikey and Mouser for $3.93.  I will check out the one you mentioned as well. Or not.  On closer examination, the one you mentioned is only good to 20V, my machine runs on 24V.


Kerry



RussellMc wrote:
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