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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 24th January 2011, 09:43 PM   #1551
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by Salas View Post
Yes. Vout. Must watch the permissible working voltage of the various resistors in HV applications too.
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Old 25th January 2011, 02:19 AM   #1552
dvb projekt is offline dvb projekt  Germany
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Simplistic Mosfet HV Shunt Regs
I try to get some Caddock Typ MS220/221

Click the image to open in full size. Click the image to open in full size.
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Old 25th January 2011, 08:05 AM   #1553
merlin el mago is offline merlin el mago
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Excellent alternative: only one resistor TCR 50ppm tol. 1%, where do you buy?
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Old 25th January 2011, 09:30 AM   #1554
kacernator is offline kacernator  Czech Republic
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Default 300V operation

Hi,

prior to my post of bad sounding Salas regulator, I had mistake in wiring, now it sounds very good. Anyway, my output target voltage is 300V. Is it ok to use schematics with MJE350 or should I go for schematics designed for more than 300V with 2N6520?

Thanks.
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Old 25th January 2011, 10:12 AM   #1555
merlin el mago is offline merlin el mago
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Salas uses 2N6520, Quanghao uses MJE350 for all Vout changing some resistors values on his pcb, so if you intended to use Salas schematic I will put 2N6520 & if you will use Quanghao pcb you can use MJE350.

MJE350
VCBO 300V
VCEO 300V

2N6520
VCBO 350V
VCEO 350V

Last edited by merlin el mago; 25th January 2011 at 10:16 AM.
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Old 25th January 2011, 10:30 AM   #1556
kacernator is offline kacernator  Czech Republic
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So I should go with higher voltage version then. I cant buy 2N6520 in my country, but they do have BF493S (also 350V), so I hope it will work well as substitute.
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Old 25th January 2011, 10:32 AM   #1557
dvb projekt is offline dvb projekt  Germany
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally Posted by merlin el mago View Post
Excellent alternative: only one resistor TCR 50ppm tol. 1%, where do you buy?
Thatīs the problem. Nobody has them in stock. I try to get a quote from Caddock directly.
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Old 25th January 2011, 11:21 AM   #1558
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by dvb-projekt View Post
Thatīs the problem. Nobody has them in stock. I try to get a quote from Caddock directly.
If possible count in me for 3 or 4 resistors?

I will ask a quote for Vishays, do you want to know the price?
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Old 25th January 2011, 11:33 AM   #1559
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by kacernator View Post
So I should go with higher voltage version then. I cant buy 2N6520 in my country, but they do have BF493S (also 350V), so I hope it will work well as substitute.
Mouser have on stock 2N6520

2N6520TA Fairchild Semiconductor Bipolar Small Signal
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Old 25th January 2011, 12:38 PM   #1560
pedefede is offline pedefede  Denmark
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Default heat on Q3

finished the positive part of my dual 300V supply for Exstata. Its P2p.

The heatsinks are a bit small (the ones for exstata's PSU), so the tempereture on the heatsinks stabilized after 15 minutes.
For irf9610 to 50 C, and for irf840 to 80C

(A bit high i guess. Adding bigger heatsinks is a problem in my chassis design, so i will add a fan. For test i just put up a 12'' PC-fan, and the tempereture fell to only 40 C

I also measured the V-out during warmup, and there was quite a nice linear correlation between V-out and tempereture of (the heatsink of) irf840. V-out raised roughly 0,5V per degree C. Is that normal??
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