Timeline for Will this short-circuit protection circuit work?
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| S Aug 7 at 17:02 | history | edited | Tim Williams | CC BY-SA 4.0 |
add a brief note; also specific part numbers, and justification
|
| S Aug 7 at 17:02 | history | suggested | jwo | CC BY-SA 4.0 |
add a brief note
|
| Aug 7 at 16:57 | review | Suggested edits | |||
| S Aug 7 at 17:02 | |||||
| Aug 6 at 6:16 | vote | accept | RUMBUFDSI | ||
| Aug 5 at 19:07 | comment | added | Tim Williams | @Jens Depends on magnitude of foldback. ;) Given the original circuit was an [attempted] CCS, I expect that power dissipation is acceptable; and if not, I have the note mentioning it. Given they keyword, one can search on design of foldback limiting, or ask a new one; it's off-topic of this question, I would say. | |
| Aug 5 at 17:15 | comment | added | Jens | Will it enable the load current at all at startup? | |
| Aug 5 at 15:37 | history | edited | Tim Williams | CC BY-SA 4.0 |
added 567 characters in body
|
| Aug 5 at 15:33 | comment | added | Tim Williams | @RohatKılıç Actually, I will add an edit, for a reason no one mentioned yet..! | |
| Aug 5 at 15:30 | comment | added | Tim Williams | The the question says 12V and made no concerns about reversal, cross-wiring, etc., so are not a concern. For example, it might be supplied from a (hard wired) battery or SMPS, or be part of a larger module where the 12V is by design, or already protected against such, etc. It's a building block, not a complete standalone module. That's how I understood the question. | |
| Aug 5 at 15:03 | comment | added | Rohat Kılıç | @TimWilliams yes, it's PMOS. The body diode's cathode at S, anode at D. In case of a reverse-polarity input it'll be forward-biased (again, ignored the diode D in your schematic). Though the OP said a reverse-polarity protection is implemented in an early stage but what if there wasn't any. | |
| Aug 5 at 13:09 | comment | added | Tim Williams | @RohatKılıç Check again -- it's PMOS, source to V2. The arrow shows the substrate diode pointing up. | |
| Aug 5 at 12:57 | comment | added | RUMBUFDSI | This answer is extremely helpful, thank you very much! | |
| Aug 5 at 12:52 | comment | added | Rohat Kılıç | +1 for the answer and the excessive work on the existing image. One other thing worth to note is the reverse polarity: VT2's body diode will be forward-biased (ignoring the D diode in your circuit) so the incandescent bulb will still light up but there won't be any current limiting or S/C protection. | |
| Aug 5 at 12:44 | history | answered | Tim Williams | CC BY-SA 4.0 |