Simplistic Mosfet HV Shunt Regs - Page 158 - diyAudio
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Old 25th January 2011, 08:33 PM   #1571
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Beyschlag ? no thanks
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Old 25th January 2011, 09:10 PM   #1572
dodo is offline dodo  Poland
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Originally Posted by nicoch46 View Post
Beyschlag ? no thanks
it's power supply not signal path
when you open medical equipment ( where psu is really important ) you will see a lot of MBE0414 from Beyschlag there

But if you can afford to spend 60$: or more for one resistor you can allways order Vishay S106Z - with desired value
you will get 2ppm, noninductive design and long term stability
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Old 25th January 2011, 11:42 PM   #1573
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my doctor use only tantalum to cure me
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Old 27th January 2011, 05:32 AM   #1574
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Originally Posted by merlin el mago View Post
If possible count in me for 3 or 4 resistors?

I will ask a quote for Vishays, do you want to know the price?
No, thanks. I hope i have luck and a friend has one or two of the Caddock´s
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Old 27th January 2011, 10:41 AM   #1575
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Originally Posted by dvb-projekt View Post
No, thanks. I hope i have luck and a friend has one or two of the Caddock´s
You are fortunate to have a friend with Caddock's, if your friend have 1 or 2 for me I will appreciate very much.
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Old 29th January 2011, 06:32 PM   #1576
roger57 is offline roger57  Canada
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Default Question - PS turn on surge and the IRFP9240 maximum Vds

I have a power supply that when steady-state, is about 465V. however, at turn on, it's just around 500V. It runs the plate supply, I also need to run the Salas shunt HV from this. I have modeled it in LT Spice. The Shunt output doesn't start ramping up until around 70ms, while on the source pin the supply is already at close to 500V. I'm using a CLC filter. Previously, I used a Maida Mosfet with no problems.
With a Vds of just 200V, I'm assuming that even for these few hundredths of a second the device would vaporize. Has anyone else had this issue, and what can be done?
Thank you for your help...
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Last edited by roger57; 29th January 2011 at 06:35 PM. Reason: Added attachment
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Old 29th January 2011, 06:35 PM   #1577
Salas is offline Salas  Greece
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I had shown a 150V 5W clamping Zener across it. But it must be short pin directly attached to it. Another solution is a 400Vmin depletion mode CCS DN2540 Supertex. A bit drier sound, but less parts also.
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Old 29th January 2011, 06:45 PM   #1578
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Quote:
Originally Posted by Salas View Post
I had shown a 150V 5W clamping Zener across it. But it must be short pin directly attached to it. Another solution is a 500V depletion mode CCS DN2540 Supertex. A bit drier sound, but less parts also.
Ok - thank you Salas, that worked out fine.
Is that what all of these parts are for??
The road to knowledge is a long, but fun one. :
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Old 29th January 2011, 06:58 PM   #1579
Salas is offline Salas  Greece
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What you show in the sim result? The addition of the clamping Zener? What parts you refer to, the enhancement mode CCS scheme parts?
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Old 29th January 2011, 07:04 PM   #1580
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Salas View Post
What you show in the sim result? The addition of the clamping Zener? What parts you refer to, the enhancement mode CCS scheme parts?
Hi Salas -
I was just joking about the parts - inferring that I should have known a zener could have been used, but not obvious to me!

The simulation shows the addition of the 150V zener.

1 other question - the 1N5383 has a resistance of 330ohms. The 1N5378 (100V) has a resistance of 90 ohms. Would this be a better choice due to the lower resistance?

Gary
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