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Old 6th July 2012, 04:04 PM   #1581
Salas is offline Salas  Greece
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You can eliminate the trimmer by substituting its measured set value by a steady resistor.
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Old 6th July 2012, 04:06 PM   #1582
CeeVee is offline CeeVee  Portugal
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Hi Salas,

Yes will try that today just to see.

Thanks
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Old 6th July 2012, 04:13 PM   #1583
CeeVee is offline CeeVee  Portugal
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Module will look something very similar to this...
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Old 6th July 2012, 04:17 PM   #1584
Salas is offline Salas  Greece
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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.
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Old 6th July 2012, 04:42 PM   #1585
CeeVee is offline CeeVee  Portugal
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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.
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Old 6th July 2012, 05:24 PM   #1586
Salas is offline Salas  Greece
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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.
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Old 6th July 2012, 07:29 PM   #1587
CeeVee is offline CeeVee  Portugal
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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.
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Old 6th July 2012, 08:02 PM   #1588
Salas is offline Salas  Greece
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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.
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Old 6th July 2012, 09:18 PM   #1589
RCruz is offline RCruz  Switzerland
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Tempco action on vref... quite normal in these implementations... My builds take 30 min to setle down.
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Old 6th July 2012, 11:08 PM   #1590
mjock3 is offline mjock3  United States
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Default 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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