Timeline for How to make this high side current limiter more predictable [closed]
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 25 at 17:14 | vote | accept | learnvst | ||
| Jun 19 at 19:49 | history | closed |
Andy aka Voltage Spike♦ |
Needs details or clarity | |
| Jun 18 at 19:22 | answer | added | bobflux | timeline score: 3 | |
| Jun 18 at 15:14 | history | edited | winny | CC BY-SA 4.0 |
Microsiemems -> microsecond
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| Jun 18 at 9:49 | history | edited | learnvst | CC BY-SA 4.0 |
added 525 characters in body
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| Jun 18 at 7:57 | review | Close votes | |||
| Jun 19 at 19:49 | |||||
| Jun 17 at 23:17 | comment | added | periblepsis | @learnvst This EESE answer provides methods for using datasheets and calculations to achieve a desired goal in predictable and thermally stable current control. It also exposes some limitations/boundaries, as well. No FET and no oscillation tendencies. But I've no idea what kind of accuracy (initial or long term) you require, if any, or how tight the precision must be, regardless. | |
| Jun 17 at 21:36 | answer | added | Dereck | timeline score: 2 | |
| Jun 17 at 19:36 | comment | added | learnvst | 100 ohm between amp and gate. Oscillating stopped putting a 220 nF (was easiest to reach) cap between gate and positive rail.. works better but still seems naff using a zener as the ref for the diff amp. Just the first thing that came to mind | |
| Jun 17 at 18:27 | answer | added | MOSFET | timeline score: 1 | |
| Jun 17 at 18:22 | comment | added | Andy aka | It will vary with R1 and R3 but, you didn't say how much. Where is the 100 ohm resistor in your schematic? | |
| Jun 17 at 18:22 | answer | added | Tim Williams | timeline score: 1 | |
| Jun 17 at 18:01 | comment | added | evildemonic | Got a model number for that MOSFET? Your amplifier can't drive more than 500 pF. If you increase the 100 ohm resistor (not shown in your schematic) do the oscillations stop? | |
| S Jun 17 at 17:25 | history | edited | learnvst | CC BY-SA 4.0 |
added 143 characters in body
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| Jun 17 at 17:24 | review | Suggested edits | |||
| S Jun 17 at 17:25 | |||||
| Jun 17 at 17:11 | history | asked | learnvst | CC BY-SA 4.0 |