SSLV1.1 builds & fairytales - Page 159

Salas · 6th July 2012, 03:04 PM

You can eliminate the trimmer by substituting its measured set value by a steady resistor.

CeeVee · 6th July 2012, 03:06 PM

Hi Salas,

Yes will try that today just to see.

Thanks

CeeVee · 6th July 2012, 03:13 PM

Module will look something very similar to this...

Salas · 6th July 2012, 03:17 PM

Very nice housing plan. With many high current regs in there, semis have a Tc, passives have a Tc, you should expect some cold-hot drift even with stiffest Vref choices. One good thing in this reg is that its normally a negative small drift. Thus safer than an escalating Vo. Remember to show us your build when finished. People are keen for cool ideas.

CeeVee · 6th July 2012, 03:42 PM

Box should be finished this weekend, regulators will follow.

There will be a mirror module on other side of box with Ni-MH cells and charger for the IV ( EUVL 's SEN ).

I was actually expecting the sink to get at least warm but it's completely cool even with your regulator at full load for 2 days !!! so i guess i can put another 2 there easy.

Salas · 6th July 2012, 04:24 PM

When this regulator is at full load near its CCS set limit only the first Mosfet dissipates. At low Vo levels as for digital and logical spare current settings (non hot-rod practice) they can be surprisingly bearable.

CeeVee · 6th July 2012, 06:29 PM

Changed pot for a 110R 1% MRS25 resistor and the drift was halved.

after half an hour 5.35V had dropped to 5.28V and stabilized.

So clearly the trimmer is just for initial adjustment and should be replaced with a resistor for operation.

Salas · 6th July 2012, 07:02 PM

Well done. I did not recommend that substitution to no effect as you saw, still the trimmer's fate is to be evaluated versus drift demand in each application by each user. SSLV1.1 PCB has a configurable Vref area to be intrinsically flexible anyway.

RCruz · 6th July 2012, 08:18 PM

Tempco action on vref... quite normal in these implementations... My builds take 30 min to setle down.

mjock3 · 6th July 2012, 10:08 PM

I am working on my Salas reg. I want to use it for a Logitech Touch. I believe I have built it correctly. My question is how hot can IRF9530 get? Also R206 how hot can it get? Both are running at about 260 F.

6th July 2012, 08:18 PM	#1589
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	Tempco action on vref... quite normal in these implementations... My builds take 30 min to setle down. __________________ RC

6th July 2012, 10:08 PM	#1590
mjock3 diyAudio Member Join Date: Jan 2011 Location: Wisconsin	First Salas I am working on my Salas reg. I want to use it for a Logitech Touch. I believe I have built it correctly. My question is how hot can IRF9530 get? Also R206 how hot can it get? Both are running at about 260 F.

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6th July 2012, 03:04 PM	#1581
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	You can eliminate the trimmer by substituting its measured set value by a steady resistor.

6th July 2012, 03:06 PM	#1582
CeeVee diyAudio Member Join Date: Dec 2006	Hi Salas, Yes will try that today just to see. Thanks

6th July 2012, 03:17 PM	#1584
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Very nice housing plan. With many high current regs in there, semis have a Tc, passives have a Tc, you should expect some cold-hot drift even with stiffest Vref choices. One good thing in this reg is that its normally a negative small drift. Thus safer than an escalating Vo. Remember to show us your build when finished. People are keen for cool ideas.

6th July 2012, 03:42 PM	#1585
CeeVee diyAudio Member Join Date: Dec 2006	Box should be finished this weekend, regulators will follow. There will be a mirror module on other side of box with Ni-MH cells and charger for the IV ( EUVL 's SEN ). I was actually expecting the sink to get at least warm but it's completely cool even with your regulator at full load for 2 days !!! so i guess i can put another 2 there easy.

6th July 2012, 04:24 PM	#1586
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	When this regulator is at full load near its CCS set limit only the first Mosfet dissipates. At low Vo levels as for digital and logical spare current settings (non hot-rod practice) they can be surprisingly bearable.

6th July 2012, 06:29 PM	#1587
CeeVee diyAudio Member Join Date: Dec 2006	Changed pot for a 110R 1% MRS25 resistor and the drift was halved. after half an hour 5.35V had dropped to 5.28V and stabilized. So clearly the trimmer is just for initial adjustment and should be replaced with a resistor for operation.

6th July 2012, 07:02 PM	#1588
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Well done. I did not recommend that substitution to no effect as you saw, still the trimmer's fate is to be evaluated versus drift demand in each application by each user. SSLV1.1 PCB has a configurable Vref area to be intrinsically flexible anyway.