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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 2nd December 2012, 02:18 PM   #3551
rickmcinnis is online now rickmcinnis  United States
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Default Thanks for the assurance

Quote:
Originally Posted by Salas View Post
Yes, it is necessary if you want the Kelvin sense system to work best, and its audible when it does so.
I went ahead and did the board surgery yesterday.

I feel much better now.

THANKS very much for the advice!
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Old 3rd December 2012, 01:32 AM   #3552
rickmcinnis is online now rickmcinnis  United States
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Default How good does the 10uF capacitor need to be?

Are there gains made with higher quality caps?

Looking at the OBBLIGATO Gold or the JANTZEN Z Superior - the OBBLIGATO certainly a better value.

Any opinions on how far to go?

Thanks,
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Old 3rd December 2012, 01:45 AM   #3553
Salas is online now Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Whatever your subjective knowledge and preference is, may it be right or wrong from your favorite capacitors in signal use, applies in that position too.
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Old 3rd December 2012, 03:45 AM   #3554
roger57 is offline roger57  Canada
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Default C1 Position, Capacitor Value

Salas,

Is a 0.47uF Ok in the C1 position, or will it put the network too far out of spec?
I happen to have some good MKP caps at that value...

Gary
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Old 3rd December 2012, 11:04 AM   #3555
Salas is online now Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Will work.
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Old 9th December 2012, 07:32 PM   #3556
roger57 is offline roger57  Canada
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Hi Salas...

I've built a second SSHV2 regulator, but for some reason, this one's not producing. I'm shooting for 350V output at 60mA across the load. For a test load, I have a 5800 ohm power resistor,
which works out to 60mA at 350V.

With both R4 (current) and R11 (voltage) wide open, the best I can get is 730mV (73mA) and 340V with 400V at the input. The bench supply is capable of about 400mA at 450V, so no problem at the supply side.

I should mention I'd like to get 80-85mA, so this should be well within spec.

Suggestions?

Thanks,
Gary

Last edited by roger57; 9th December 2012 at 07:38 PM. Reason: was not finished!
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Old 9th December 2012, 07:45 PM   #3557
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Simplistic Mosfet HV Shunt Regs
Your test load should be 20mA less than CCS setting. Give it 370V input to see if the input Mosfets will produce 80mA. Else if they aren't particularly mighty for IDSS and VR4 at max, make the 10 Ohm TP resistor (R5) to 1 Ohm and translate mV for mA 1:1. That will detract less from top IDSS.
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Old 9th December 2012, 07:47 PM   #3558
Salas is online now Salas  Greece
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Simplistic Mosfet HV Shunt Regs
If Vo is still not reaching, put a higher IDSS 2SK117.
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Old 9th December 2012, 08:19 PM   #3559
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Salas View Post
If Vo is still not reaching, put a higher IDSS 2SK117.
My input MOSFET, as discussed previously, is the IXTP08N50D2. It's rated at 500V and 800mA, and had no issues getting 350V at 80mA in my other board.

I'll try replacing the 2SK117 and will test one for a different Idss. What's the minimum Idss required to achieve the spec output of the regulator of 380V at 100mA? Is higher, or as high as possible, better?



Thanks again,
Gary

Last edited by roger57; 9th December 2012 at 08:29 PM.
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Old 9th December 2012, 09:27 PM   #3560
Salas is online now Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Yep it may, but the Supertex one underneath does the current. The IXTP shields HV.

(68Kx2)*K117 max in circuit current=Vo max.
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