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Old 21st January 2011, 07:31 PM   #1531
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Old 21st January 2011, 08:09 PM   #1532
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Sure. Simply remember to allow 20-25mA spare in the reg after subtracting your max load draw from the total CCS setting.
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Old 24th January 2011, 01:03 AM   #1533
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Default HV settings for best performance.

Hi Salas.
I am sure this question has been answered many times before, but if I may: I want an output of 250V at a maximum of 16 m.a.. What would be the minimum voltage to input on the regulator to obtain optimun performances?
Would 35 m.a. be enough in the current department.
I read that bypassing C2 with a 100nf capacitor makes an interesting upgrade. Is there anything else we could do?
Thank you.
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Old 24th January 2011, 01:16 AM   #1534
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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.
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Old 24th January 2011, 02:00 PM   #1535
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Originally Posted by Salas View Post
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.
The 120K Rref must be 2W or can be 1W or less, I'm asking this info due to the fact it's very difficult to get 2W in only one resistor with low ppm....
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Old 24th January 2011, 02:58 PM   #1536
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2W or more. Many Volt across create dissipation. You can use 2x 220k-270k 1W in parallel. Arrange them in reverse direction between them. Like their color stripes or numbers & logo will look the opposite direction.
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Old 24th January 2011, 05:53 PM   #1537
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120K Vishay S106D 2W

http://www.texascomponents.com/pdf/vrths.pdf
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Old 24th January 2011, 06:20 PM   #1538
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Dale RN70 in parallel wouldn't be bad also.
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Old 24th January 2011, 06:56 PM   #1539
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Dale RN70 in parallel wouldn't be bad also.
rather yes
200k-300k standard metal film (also RN Vishay) are quite inductive ( more the 10uH)
reverse parallel config will somehow reduce it but how much ??

best metal film tempoco for 2W resistors I have found 50ppm

MP 930 Caddock came to mine mind (noninductive -50ppm - but working voltage is a limit in HVSS
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Old 24th January 2011, 07:06 PM   #1540
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I found 120K 2W 50ppm metal film but I suspect is inductive

WELWYN|MFP2-120K JI|RESISTOR, 2W 5% 120K | Farnell España
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