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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 15th December 2011, 07:46 PM   #2161
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
In working state the CCS is gonna have only the Vin-Vout drop across. Its all a matter of start up and transient garbage. The zeners on the gates help, but we never know.
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Old 16th December 2011, 07:28 AM   #2162
kenev is offline kenev  Greece
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Quote:
Originally Posted by Salas View Post
In working state the CCS is gonna have only the Vin-Vout drop across. Its all a matter of start up and transient garbage. The zeners on the gates help, but we never know.
So, do you think I could give it a try?
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Old 16th December 2011, 09:09 AM   #2163
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Maybe, but I can't predict.
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Old 17th December 2011, 10:07 AM   #2164
king4joy is offline king4joy  Hong Kong
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Quote:
Originally Posted by merlin el mago View Post
SSHV2 B.O.M.

Q1-2 DN2450
Q3 IRF840
Q4-5 KSA1381
Q6 2SK117GR
IDSS? HEATSINKS FOR IRF840 & MINI-HEATSINKS FOR KSA1381?

D1-2-3 Z12V 0.5W
D4 LED VALUE?

R1-2 100R
R3 330R
VR4 500R
R5 10R
R6 1R86
R7 100R
R8 1K
R9-10 68K 2W
VR11 500R
R12 1K

C1 0.33uF
C2 10uF
**

Salas.....SSHV2....R8....in my application should I use 1K or 1.8K...or other value....thankyou.
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Old 17th December 2011, 11:17 AM   #2165
AndrewT is offline AndrewT  Scotland
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The LED can be RED, or ORANGE, or GREEN, or YELLOW.
Each colour comes within a range of voltage and that voltage range varies markedly with production method and manufacturer.

Expect 1.55V to 2.1V as the range within which all those "normal leaded end" LEDs will fall.

You have to measure the as built circuit to confirm what currents are passing individual components. Then adjust component values if necessary.
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Old 17th December 2011, 11:22 AM   #2166
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally Posted by king4joy View Post
**

Salas.....SSHV2....R8....in my application should I use 1K or 1.8K...or other value....thankyou.

R8=1K8 is the correct value, and its crucial to SOA.
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Old 17th December 2011, 12:51 PM   #2167
king4joy is offline king4joy  Hong Kong
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SOA = ?? son of ???? :-)
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Old 17th December 2011, 12:53 PM   #2168
Audiofanatic is offline Audiofanatic  Netherlands
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Thumbs up LOL

Quote:
Originally Posted by king4joy View Post
SOA = ?? son of ???? :-)
SOA= Safe Operating Area


Audiofanatic
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Be nice to animals.
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Old 17th December 2011, 12:56 PM   #2169
AndrewT is offline AndrewT  Scotland
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and remember to de-rate the SOA for temperature.
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Old 17th December 2011, 12:57 PM   #2170
king4joy is offline king4joy  Hong Kong
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So be it.....the son of the area.....learn something new everyday....a very good forum.....enjoying it...
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