Timeline for constant voltage drop at (relatively) high current
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 12, 2015 at 18:47 | history | edited | Null♦ | CC BY-SA 3.0 |
added 14 characters in body; edited tags
|
| Jul 15, 2015 at 3:14 | vote | accept | jeduffy | ||
| Jul 14, 2015 at 1:45 | answer | added | Bruce Abbott | timeline score: 0 | |
| Jul 14, 2015 at 0:20 | answer | added | EM Fields | timeline score: 1 | |
| Jul 13, 2015 at 0:52 | comment | added | jeduffy | @EM Fields Sorry, I didn't know the "only edit comment after 5 minutes" thing, and accidentally saved the other comment without a fill explanation. The question wasn't about an lm350 operating outside of it's normal parameters, but what happens if the resistor ratio is set for 100V OUTPUT, but it is only supplied with 12V, or set for 50A output, but only supplied with 12V into a 30 ohm load. Would it drop the output to 10.75V, and if so, how precise and accurate would that drop be? | |
| Jul 13, 2015 at 0:45 | comment | added | jeduffy | @EM Fields The LM350 isn't actually regulating 100V or 50A. It will never have to take more than ~20V at 2.5A in. There will be 2 in parallel (with the necessary low-value resistors, though not included in the schematic). | |
| Jul 13, 2015 at 0:43 | history | edited | jeduffy | CC BY-SA 3.0 |
added schematic and cleared up the 50A/100V thing
|
| Jul 12, 2015 at 13:03 | comment | added | EM Fields | I'll gladly do it if you'll edit your question with a schematic showing how you expect to regulate at around 100 volts or get 6 amperes out of an LM350, let alone 50 amperes using it as a constant current source without some off-chip help. | |
| Jul 12, 2015 at 7:30 | comment | added | jeduffy | @EM Fields I'm not exactly sure what you mean by that. There is no set of resistors that will work correctly. For it to be linear, all resistors at each stage must be the same, but then, the output will be 1.25v too high. I fail to see where a series pass stage will help, the lm350 can push enough current and regulate well enough. As I understand it, a series pass would just regulate to some other voltage, much like a fixed linear regulator. Can you explain more specifically how this should be connected? | |
| Jul 11, 2015 at 9:33 | comment | added | EM Fields | Why don't you just switch in the proper resistances between the OUT and ADJUST pins which will result in the voltages you want at the OUT pin, and shunt the LM350 with a high current series pass stage? | |
| Jul 11, 2015 at 5:56 | review | First posts | |||
| Jul 11, 2015 at 15:12 | |||||
| Jul 11, 2015 at 5:56 | history | asked | jeduffy | CC BY-SA 3.0 |