The simplistic Salas low voltage shunt regulator - Page 408

Salas · 13th July 2011, 02:10 PM

Its a non question if power isn't mentioned. There is a section in the Bib guide about roughly calculating its sinking.

merlin el mago · 13th July 2011, 02:11 PM

500mA

Salas · 13th July 2011, 02:18 PM

0.5A=CCS? P=V*I. What will be the Vin, the Vout? What will be the load consumption? Define all those, then read the V1.1 Bib guide section 6:

"6.Sinking.
Q101,201,301 is the CCS Mosfet. Q106,206,306 is the shunt element. Q101 will dissipate the (DCin-DCout) * CCS current setting. Q106 will dissipate DCout * (CCS-LoadCurrent). From those Wattage products the sinking needs can be projected. If you will use a common sink 2C/W for 10W total dissipation, its temperature will rise +20 degrees C from ambient for instance. In most situations for up to 200mA settings and medium DCouts, sinking on metal enclosure floor or sides proves much tolerable. The power semis can be set upright for side sinking or underneath for parallel sinking as in the picture. For low CCS setting and DCout, individual clip on sinks can do. Check the above P=I*V conditions in your application thoroughly before any working attempts!''

Sink the above info down well, then choose sinks.

merlin el mago · 13th July 2011, 02:22 PM

Yes 0.5A CCS
Vin 55VDC
Vout 45VDC
Salas NJFET RIAA post 2795 page 280, how much is the consumption?

Salas · 13th July 2011, 02:27 PM

About 30mA per channel. Don't go over 50VDCin (36VAC Tx) for the Bib, says so in its instructions.

carlmart · 15th July 2011, 03:28 PM

Which are best diodes or bridges to use on a power amplifier, rectifying bot a Salas regulator and for unregulated power?

Schottky, fast soft recovery, Hexfreds, etc.

canvas · 15th July 2011, 03:35 PM

I use Moto MUR1520s on power amp and they are great. On digital, I prefered IR HFA08TB60 Hexfreds. Someone said schottky is the best for low current devices because there is virtually no recovery.

keantoken · 15th July 2011, 03:54 PM

What about SiC schottkeys, with no recovery time, or so I've heard?

- keantoken

barrows · 15th July 2011, 04:43 PM

MSRF diodes from ON Semi. These are medium speed, super soft recovery diodes and seem to be the most quiet diodes I can find. They are designed with soft recovery being the highest priority, rather than super fast switching (still pretty fast though). I have never understood why people always want the super fast diodes for 50/60 hz AC power supplies, a lot of these super fast diodes have more noise. I use these for line level stuff: the MSRF 860G is a 600V 8A TO-220 style. They also have a nice surface mount version of these (I think those ones are 4 A).

keantoken · 15th July 2011, 05:00 PM

Fast recovery only means no glitching I think. But that just means it's not an exaggerated cutoff. It's still a cutoff, and will excite resonances. So you must be right about soft recovery.

- keantoken

15th July 2011, 03:54 PM	#4078
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas Blog Entries: 1	What about SiC schottkeys, with no recovery time, or so I've heard? - keantoken __________________ The Kmultiplier rail filter! LTSpice wiki with special attention to new users' troubles

15th July 2011, 04:43 PM	#4079
barrows diyAudio Member Join Date: Jul 2010	I prefer... MSRF diodes from ON Semi. These are medium speed, super soft recovery diodes and seem to be the most quiet diodes I can find. They are designed with soft recovery being the highest priority, rather than super fast switching (still pretty fast though). I have never understood why people always want the super fast diodes for 50/60 hz AC power supplies, a lot of these super fast diodes have more noise. I use these for line level stuff: the MSRF 860G is a 600V 8A TO-220 style. They also have a nice surface mount version of these (I think those ones are 4 A).

15th July 2011, 05:00 PM	#4080
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas Blog Entries: 1	Fast recovery only means no glitching I think. But that just means it's not an exaggerated cutoff. It's still a cutoff, and will excite resonances. So you must be right about soft recovery. - keantoken __________________ The Kmultiplier rail filter! LTSpice wiki with special attention to new users' troubles

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13th July 2011, 02:10 PM	#4071
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Its a non question if power isn't mentioned. There is a section in the Bib guide about roughly calculating its sinking.

13th July 2011, 02:11 PM	#4072
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	500mA

13th July 2011, 02:18 PM	#4073
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	0.5A=CCS? P=VI. What will be the Vin, the Vout? What will be the load consumption? Define all those, then read the V1.1 Bib guide section 6: "6.Sinking. Q101,201,301 is the CCS Mosfet. Q106,206,306 is the shunt element. Q101 will dissipate the (DCin-DCout) CCS current setting. Q106 will dissipate DCout * (CCS-LoadCurrent). From those Wattage products the sinking needs can be projected. If you will use a common sink 2C/W for 10W total dissipation, its temperature will rise +20 degrees C from ambient for instance. In most situations for up to 200mA settings and medium DCouts, sinking on metal enclosure floor or sides proves much tolerable. The power semis can be set upright for side sinking or underneath for parallel sinking as in the picture. For low CCS setting and DCout, individual clip on sinks can do. Check the above P=I*V conditions in your application thoroughly before any working attempts!'' Sink the above info down well, then choose sinks.

13th July 2011, 02:22 PM	#4074
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Yes 0.5A CCS Vin 55VDC Vout 45VDC Salas NJFET RIAA post 2795 page 280, how much is the consumption?

13th July 2011, 02:27 PM	#4075
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	About 30mA per channel. Don't go over 50VDCin (36VAC Tx) for the Bib, says so in its instructions.

15th July 2011, 03:28 PM	#4076
carlmart diyAudio Member Join Date: Mar 2001 Location: Brazil	Which are best diodes or bridges to use on a power amplifier, rectifying bot a Salas regulator and for unregulated power? Schottky, fast soft recovery, Hexfreds, etc.

15th July 2011, 03:35 PM	#4077
canvas diyAudio Member Join Date: Nov 2003 Location: Taiwan	I use Moto MUR1520s on power amp and they are great. On digital, I prefered IR HFA08TB60 Hexfreds. Someone said schottky is the best for low current devices because there is virtually no recovery.