network profile
| bio | website | |
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| age | ||
| visits | member for | 1 year, 1 month |
| seen | Apr 12 '12 at 5:10 | |
| stats | profile views | 6 |
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Apr 26 |
awarded | Popular Question |
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Apr 12 |
comment |
Need help driving N FET gate from LM393 comparator output Thanks for the suggestions, no scope but i will try the cap at the comparator output. Great idea thanks. I need to simulate this circuit....anyway thanks again, i will update |
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Apr 11 |
awarded | Commentator |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output I hear ya. Thanks. Im gonna try amplifying the output of the chip bc it seems to otherwise work. |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output Well how do i 'fix' it jason? Im going for a pseudo switching supply here.....works other than the gate voltage being too low and causing heating and waste. This occurs even with a low battery and therefore with a significant difference between the voltages at the comparator's inputs. The fet remains on as expected when connected to a lead acid battery but again Rds is too high due to gate voltage. Correct me if im wrong but hysteresis would have no bearing there. Right? |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output Frustrating......i just connected this circuit without changing it, battery for a load and panel for input.....it does switch on and off and does regulate the voltage. When i connect it to a dead lead acid the comparator output does go high (if not connected to anything other than the pull up resistor) close to supply voltage. When the comparator output is tied to the gate it never reaches 4v. When i feed 5v into the gate manually using a pot, with comparator output disconnected, current flows through the fet with little impedance ; almost no heat in spite of several amps. Sigh |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output Awesome answer! Thanks. As i said I will post any updates. |
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Apr 11 |
awarded | Student |
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Apr 11 |
comment |
Need help driving N FET gate from LM393 comparator output If by linear you mean the fet would be partially on at times, i want to avoid that. I want it full on or off to avoid a lot of heat dissipation. I figured the circuit would just switch however fast it needed to....im not exactly clear on why the fet gate voltage is low though. |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output Thank you very much. I will post any updates. Also how am i reinventing the charge controller exactly? Is there an easier way to go about this without buying a controller? |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output I tried a resistor from out to gnd. Thing is the lm393 outputs low only, that is when the output is high the only source for positive voltage is the pull up resistor. So the gate gets grounded everytime the output is low. |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output Thanks everyone. One thing: I didn't think i was 'reinventing' anything. Perhaps someone could enlighten me on another way to do this without using a dummy load. |
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Apr 11 |
revised |
Need help driving N FET gate from LM393 comparator output added 21 characters in body |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output I tried an RL2203N as well as a RFP50N06, I have a ton of em. |
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Apr 11 |
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Need help driving N FET gate from LM393 comparator output Thanks steven, link should work now. Is there any harm in waiting until i get the fet turning on all the way first? Also whats the best way to add hysteresis? Im a little new with comparators. |
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Apr 11 |
revised |
Need help driving N FET gate from LM393 comparator output deleted 8 characters in body |
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Apr 11 |
awarded | Editor |
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Apr 11 |
revised |
Need help driving N FET gate from LM393 comparator output added 17 characters in body |
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Apr 11 |
asked | Need help driving N FET gate from LM393 comparator output |
