Timeline for Are activated open-collector and open-drain circuits wasting energy?
Current License: CC BY-SA 4.0
14 events
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| Mar 2, 2019 at 22:20 | comment | added | D.A.S. | I suspect the upper limit of 3k ensures the Coss*R meets TpLH spec | |
| Mar 2, 2019 at 22:14 | comment | added | DKNguyen | Yeah, higher speed of a low R the balancing criteria that balances out against lower power consumption of a high R in this case (which I suppose is no different from most everything else). Otherwise you could just always use a 1 megaohm pull-up resistor. | |
| Mar 2, 2019 at 22:13 | comment | added | D.A.S. | The important thing for OP to learn was in both answers impedance vs Toff are dependant on source impedance and C load (internal and external) for open collector on input and open drain on output | |
| Mar 2, 2019 at 22:11 | comment | added | DKNguyen | NP. It took me a while to figure out what angle you were reading the question from. | |
| Mar 2, 2019 at 22:10 | comment | added | D.A.S. | OK I re-wrote it, TY @Toor | |
| Mar 2, 2019 at 22:10 | history | edited | D.A.S. | CC BY-SA 4.0 |
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| Mar 2, 2019 at 22:04 | history | edited | D.A.S. | CC BY-SA 4.0 |
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| Mar 2, 2019 at 21:52 | comment | added | DKNguyen | Again, your comments seem completely off-base from what the question is asking. He's asking about the OUTPUT of the optocoupler whereas you're weirdly focused on the LED drive at the input and the photoreceiver. His question is about open-collector outputs in general, not optocouplers. Perhaps you mistook him for wanting to ask about the open emitter or collector drive of the LED (something that is neither shown nor implied in his schematic)? | |
| Mar 2, 2019 at 21:42 | history | edited | D.A.S. | CC BY-SA 4.0 |
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| Mar 2, 2019 at 21:42 | comment | added | DKNguyen | It's almost like you're reading a different question. | |
| Mar 2, 2019 at 21:38 | history | edited | D.A.S. | CC BY-SA 4.0 |
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| Mar 2, 2019 at 21:36 | comment | added | Gearoid Murphy | "An emitter follower, for example, will not pull any current to anode LED". What do you mean by that? (For the record, I'm an electronics novice and always appreciate the time people take to provide their insight, even if it isn't always on the mark). | |
| Mar 2, 2019 at 21:33 | comment | added | DKNguyen | I think maybe because it didn't answer OP's question. He's just asking if pull-up resistors and open-collector outputs consume current when outputting a LO. | |
| Mar 2, 2019 at 21:25 | history | answered | D.A.S. | CC BY-SA 4.0 |