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Author Topic: i neeed equivalent component ............  (Read 993 times)
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satya
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« on: February 12, 2010, 04:56:54 04:56 »

hi
i am working on smps power supply

TL431 shunt regulator working up to 37Vdc but i need a shunt voltage regulator working 75Vdc

please give the any equivalent part number.........


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solutions
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« Reply #1 on: February 12, 2010, 05:14:22 05:14 »

I hope you've done the math Vdrop*I - your power dissipation just doubled....

Check out Supertex
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borberk
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« Reply #2 on: February 12, 2010, 12:07:14 12:07 »

Use this:
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tAhm1D
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« Reply #3 on: February 12, 2010, 05:33:09 17:33 »

satya,
You can do it with zener and transistor. For variable ref.,you can add a pot.
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PilotPTK
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« Reply #4 on: February 13, 2010, 06:15:43 06:15 »

You can also add a big 40ish V Zeener before the shunt regulator.  It will eat the 40 Volts and show only 35 to the Shunt regulator.

As solutions mentioned, make sure you have a part that can dissipate 40V * I = Watts.  Running the Shunt Regulator near it's limits also requires watching the VDrop * I for the regulator.

You may want to absorb even more in a zeener if the voltage in is relatively stable..

For example

75V -> 70V Zeener -> Shunt Regulator -> 12V

That way, you can use a big fat zeener, show only 15V to the Shunt Regulator and only have to drop 3V * I in the shunt.

PPtk
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satya
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« Reply #5 on: February 13, 2010, 06:34:13 06:34 »

hi

Thank you
but i need 75Vshunt regulator ( only single component )

i can not use any equivalent circuit.  my pcb  is very small no space available for extra components.


regards
satya
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PilotPTK
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« Reply #6 on: February 13, 2010, 07:01:17 07:01 »

Without additional components, I don't think you're going to get what you need.  The highest shunt regulator that I know of takes a max of 42V IN.

What is your actual VIN and VOUT requirement?  Depending on the drop, something like a floating LM317 might work.

PPtk
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oldvan
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« Reply #7 on: February 13, 2010, 07:32:05 07:32 »

Perhaps you could use a TL783.  Good to 150V input.  Pretty much a LM317 on steroids.
http://focus.ti.com/lit/ds/symlink/tl783.pdf

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=296-20687-5-ND
A couple bucks US each.
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