Simplistic Mosfet HV Shunt Regs - Page 311

RollE2k · 24th July 2012, 09:17 AM

Thanks for the fast answer! Will probably try this later on if i cant find a better placement for the PCB.

Salas · 24th July 2012, 09:23 AM

Make sure you got spare semis, since this is beyond prototypes team tested territory, and that extension cabling is inductive in a sensitive place.

studiostevus · 24th July 2012, 12:57 PM

Quote:

Originally Posted by studiostevus

You are probably right, but usually PSUD2 is quite spot-on:

I am using a transformer from a reputable source in Germany, multiple members have used it before without problems.

The chokes are specified by the same source as 330Ohm. I have modeled this correctly in PSUD2.

I did some further calculation, and think I could live with 170V input voltage (then I could have 150V output voltage which would work in my application). However I still don't understand this extreme sagging...

Theoretically, if I would have been satisfied with a -say- 10mA@100V supply. I would be looking for 30mA CCS and 100V output voltage. Even that is not achievable now.... I can't get my CCS above 13mA...

Salas · 24th July 2012, 02:11 PM

You got to debug then. Maybe your CCS is in oscillation in your layout version, maybe some semi is out. Use the scope in main nodes, look for Vgs, Vbe, to be healthy etc. Give the reg a feed from first cap of raw supply to see if something changes.

Tfan69 · 25th July 2012, 06:16 PM

Hello,
Did a little mistake when ordering part and bought dn2540 to92, so very little current flow... i have some dn2535 to220 on hand, can i use these? Vin is 280v...

massimo · 25th July 2012, 08:51 PM

How many T092 did you bought? Where are you located? We can exchange some if you don't need them...

Tfan69 · 26th July 2012, 12:17 AM

Hi Massimo, check your pm 's

Tfan69 · 27th July 2012, 09:48 AM

Massimo your pm folder is full, i cannot reply to your msg...

kacernator · 28th July 2012, 11:32 AM

Hi,

I have running SSHV1, cascoded version. Between cold startup and warmed up run, I have 30V of difference. I am using 2SK170GR. Can I do something to make the output voltage not to drift with temperature?

Thanks.

merlin el mago · 28th July 2012, 11:37 AM

Measure the real resistance in the trimmer and substitute for a low ppm fixed resistor.

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24th July 2012, 09:17 AM	#3101
RollE2k diyAudio Member Join Date: Nov 2007	Thanks for the fast answer! Will probably try this later on if i cant find a better placement for the PCB.

24th July 2012, 09:23 AM	#3102
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Make sure you got spare semis, since this is beyond prototypes team tested territory, and that extension cabling is inductive in a sensitive place.

24th July 2012, 02:11 PM	#3104
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	You got to debug then. Maybe your CCS is in oscillation in your layout version, maybe some semi is out. Use the scope in main nodes, look for Vgs, Vbe, to be healthy etc. Give the reg a feed from first cap of raw supply to see if something changes.

25th July 2012, 06:16 PM	#3105
Tfan69 diyAudio Member Join Date: May 2009	Hello, Did a little mistake when ordering part and bought dn2540 to92, so very little current flow... i have some dn2535 to220 on hand, can i use these? Vin is 280v...

25th July 2012, 08:51 PM	#3106
massimo diyAudio Member Join Date: Dec 2002 Location: Milan, Italy	How many T092 did you bought? Where are you located? We can exchange some if you don't need them...

26th July 2012, 12:17 AM	#3107
Tfan69 diyAudio Member Join Date: May 2009	Hi Massimo, check your pm 's

27th July 2012, 09:48 AM	#3108
Tfan69 diyAudio Member Join Date: May 2009	Massimo your pm folder is full, i cannot reply to your msg...

28th July 2012, 11:37 AM	#3110
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Measure the real resistance in the trimmer and substitute for a low ppm fixed resistor.