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Group Buy for Jan's high voltage regulator

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B

Billc

Member
Joined 2002
SigFire 2x
jhicks 2x
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siddv 2x
valtus 2x
larslang 2x
tassosk 2x
fbjohn 1x
Stixx 2x
randytsuch 1x
obh 2x
exeric 2x
misterno 1X
mravinsky 2x
ste 1x
Arthur 2X
Boar206 2x
shattered_dream 2x
dhsettim 2x with opamp
jmlow 2X with opamp
kartk 2x with opamp
adams_leo 2x
benGeesink 2x
torrence 1x
Billc 4x with opamp
 
chede

chede

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Joined 2016
Paid Member
SigFire 2x
jhicks 2x
skunark 2x
Francois G 2x
siddv 2x
valtus 2x
larslang 2x
tassosk 2x
fbjohn 1x
Stixx 2x
randytsuch 1x
obh 2x
exeric 2x
misterno 1X
mravinsky 2x
ste 1x
Arthur 2X
Boar206 2x
shattered_dream 2x
dhsettim 2x with opamp
jmlow 2X with opamp
kartk 2x with opamp
adams_leo 2x
benGeesink 2x
torrence 1x
Billc 4x with opamp
chede 2x
 
Y

ymwong

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Joined 2003
Paid Member
SigFire 2x
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valtus 2x
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tassosk 2x
fbjohn 1x
Stixx 2x
randytsuch 1x
obh 2x
exeric 2x
misterno 1X
mravinsky 2x
ste 1x
Arthur 2X
Boar206 2x
shattered_dream 2x
dhsettim 2x with opamp
jmlow 2X with opamp
kartk 2x with opamp
adams_leo 2x
benGeesink 2x
torrence 1x
Billc 4x with opamp
chede 2x
ymwong 3x with opamp
 
jan.didden

jan.didden

AX tech editor
Joined 2002
linearaudio.net
Paid Member
SigFire 2x
jhicks 2x - shipped
skunark 2x
Francois G 2x
siddv 2x
valtus 2x
larslang 2x
tassosk 2x
fbjohn 1x
Stixx 2x
randytsuch 1x
obh 2x - shipped
exeric 2x - shipped
misterno 1X
mravinsky 2x
ste 1x
Arthur 2X
Boar206 2x
shattered_dream 2x
dhsettim 2x with opamp
jmlow 2X with opamp
kartk 2x with opamp
adams_leo 2x
benGeesink 2x
torrence 1x - shipped
Billc 4x with opamp
chede 2x
ymwong 3x with opamp

I will ship another 20 units coming week.
 
jan.didden

jan.didden

AX tech editor
Joined 2002
linearaudio.net
Paid Member
jmlow said:
What should the input voltage be for a desired output voltage?
Click to expand...

The regulator itself needs just a few volts headroom, but you must be aware of the input ripple.

Let us say you have an input voltage with ripple that has at the peak 280V, at the bottom 265V, so ripple is 15V peak-peak.
Give the regulator 5V and your max Vout is 260V.

But there's also the mains variation. On a bad day the mains can easily drop 5V AC on a 220V circuit, say 2.5%, which is say 6 or 7V on the rectified 280V peak. To take care of that set Vout 7V lower, to 253V.

You could also play it safe and set Vout to 250V. Be aware though that large Vin-Vout differences increase dissipation on the pass MOSFER as it has to absorb the voltage difference x current drawn.

How to measure the Vin and ripple: Measure Vin with a DC voltmeter. That will give you close to the average. Then measure Vin with an AC voltmeter. That gives you close to the RMS ripple. To convert the RMS ripple to peak-to-peak take the value measured x 3.
You Vin will be ~ measured average +/- 1.5 x the calculated ripple peak-to-peak.

Disclaimer: this is all rule of thumb, but good enough to get an idea what max Vout you can set and still keep regulation. Take a safety factor of 5V.
If you have a scope you can look at the Vin and see the min-max values, of course.

Jan
 
jan.didden

jan.didden

AX tech editor
Joined 2002
linearaudio.net
Paid Member
Earlier in the thread someone wondered what would happen if you connected the output to a fully charged capacitor while the input was off.
It's not clear to me how that could happen; where you'd get a fully charged cap unless you have the regulator on. But this is easy to simulate so I did that.

What happens is that the fully charged output cap discharges via the pass device parallel diode, which is normally off. Then I see a current of some 8uA flowing through the opamp inputs into the reference cap. In that scenario the max allowed voltage difference between the opamp inputs is exceeded. Why there is only 8uA is probably because the opamp model doesn't fully model the input stage over-voltage.

I made a quick fix to replace D3 with a 2.7V zener diode. That keeps the opamp input stage voltage below some 2.5V, no problem.
I just tried it out on my prototype and I see no difference in performance.

So, if you are worried about that extremely unlikely scenario, put in a 2.7V zener at D3 and relax. Mouser 625-BZX85C2V7-TAP is a good one.

I will update the online BOM as well as the online schematic.

Jan
 
Last edited:
A

Andreas B

Member
Joined 2008
otenet.gr
SigFire 2x
jhicks 2x - shipped
skunark 2x
Francois G 2x
siddv 2x
valtus 2x
larslang 2x
tassosk 2x
fbjohn 1x
Stixx 2x
randytsuch 1x
obh 2x - shipped
exeric 2x - shipped
misterno 1X
mravinsky 2x
ste 1x
Arthur 2X
Boar206 2x
shattered_dream 2x
dhsettim 2x with opamp
jmlow 2X with opamp
kartk 2x with opamp
adams_leo 2x
benGeesink 2x
torrence 1x - shipped
Billc 4x with opamp
chede 2x
ymwong 3x with opamp
Andreas B 1X
 
A

Andreas B

Member
Joined 2008
otenet.gr
SigFire 2x
jhicks 2x - shipped
skunark 2x
Francois G 2x
siddv 2x
valtus 2x
larslang 2x
tassosk 2x
fbjohn 1x
Stixx 2x
randytsuch 1x
obh 2x - shipped
exeric 2x - shipped
misterno 1X
mravinsky 2x
ste 1x
Arthur 2X
Boar206 2x
shattered_dream 2x
dhsettim 2x with opamp
jmlow 2X with opamp
kartk 2x with opamp
adams_leo 2x
benGeesink 2x
torrence 1x - shipped
Billc 4x with opamp
chede 2x
ymwong 3x with opamp
Andreas B 2X

correct
Regards
 
G

gillougillou

Member
Joined 2009
SigFire 2x
jhicks 2x - shipped
skunark 2x
Francois G 2x
siddv 2x
valtus 2x
larslang 2x
tassosk 2x
fbjohn 1x
Stixx 2x
randytsuch 1x
obh 2x - shipped
exeric 2x - shipped
misterno 1X
mravinsky 2x
ste 1x
Arthur 2X
Boar206 2x
shattered_dream 2x
dhsettim 2x with opamp
jmlow 2X with opamp
kartk 2x with opamp
adams_leo 2x
benGeesink 2x
torrence 1x - shipped
Billc 4x with opamp
chede 2x
ymwong 3x with opamp
Andreas B 2X
gillougillou 1x with opamp


:)
 
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