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Old 24th January 2011, 07:40 PM   #1541
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
I found 120K 2W 50ppm metal film but I suspect is inductive

WELWYN|MFP2-120K JI|RESISTOR, 2W 5% 120K | Farnell España
Don't know if there will be anything much to gain if non inductive, but low ppm is good to have since its a reference.
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Old 24th January 2011, 07:48 PM   #1542
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260-265V will suffice as minimum DC input to the 250V reg. 35mA will be enough for 16mA max load consumption. Make it 40mA if you can, its a bit better. CLC pre filtering and a good C2 or bypass, replacing the trimmer with a low ppm resistor after finding the value, a good C3 or bypass, a low ppm non inductive 120K Rref, short cabling to the load, that is about it.

I have used 2 x 242k Beyschlag PROFFESIONAL MBE0414 1W 50ppm with good results
But you have to buy a lot of them to find the same final rev after triming
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Old 24th January 2011, 08:05 PM   #1543
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Non inductive is welcome, low ppm is first priority IF decided to go best resistor parts. Still it works adequately with common parts. In what application you used the SSHV? Had good results?
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Old 24th January 2011, 09:24 PM   #1544
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Don't know if there will be anything much to gain if non inductive, but low ppm is good to have since its a reference.
Other solution searching non inductive is Caddock MK132 0.75W in parallel 210K//287K = 1.5W 121K267, will be enough power?
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Old 24th January 2011, 09:29 PM   #1545
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Up to 250V the ref resitor(s) will dissipate 0.5W. I consider 3x choice as wise always. So 1.5W will be OK up to 250V and 2W for 300V for example.
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Old 24th January 2011, 09:33 PM   #1546
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Are Vout of course?

For 2W Caddock MK132 4 resistors in parallel: 1 499K + 3 475K = 120K1952333 3W 50ppm

3 resistors in parallel 2W25 50ppm: 383K // 365K // 348K = 121K5915561

Last edited by merlin el mago; 24th January 2011 at 09:55 PM.
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Old 24th January 2011, 09:36 PM   #1547
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Yes. Vout. Must watch the permissible working voltage of the various resistors in HV applications too.
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Old 24th January 2011, 09:40 PM   #1548
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Caddock MK132 are 400V/Max.
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Old 24th January 2011, 09:41 PM   #1549
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Originally Posted by merlin el mago View Post
I found 120K 2W 50ppm metal film but I suspect is inductive

WELWYN|MFP2-120K JI|RESISTOR, 2W 5% 120K | Farnell España
350V
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Old 24th January 2011, 09:42 PM   #1550
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500V
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