Timeline for LM7805 decoupling capacitors
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 9, 2022 at 11:20 | vote | accept | Erick.87 | ||
| Sep 7, 2022 at 16:45 | history | edited | ocrdu | CC BY-SA 4.0 |
added 8 characters in body
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| Sep 7, 2022 at 13:56 | answer | added | rdtsc | timeline score: 2 | |
| Sep 7, 2022 at 13:50 | answer | added | Tony Stewart EE75 | timeline score: 2 | |
| Sep 7, 2022 at 13:48 | comment | added | user263983 | 7805 is pretty stable and it will work. Output capacitor big value need to compensate load current change. If load stable, value can be lower. Input capacitor need to reduce pulsation, min voltage should not be under approximately 8V, so the value depends on max load current. | |
| Sep 7, 2022 at 13:41 | comment | added | Gil | What data sheet are looking at, the ones I see typically show them. Some state:". All characteristics are measured with a 0.33-µF capacitor across the input and a 0.1-µF capacitor across the output". My recommendation is to follow the manufacturer's data sheet. If you will use other brands put them in. | |
| Sep 7, 2022 at 13:33 | review | Close votes | |||
| Sep 9, 2022 at 3:53 | |||||
| Sep 7, 2022 at 13:29 | comment | added | jonk | Without taking time for analysis, I can just say that higher ESR electrolytics may have important zeros in the transfer function that help control the gains in certain terms. That more applies to LDO types. The 7805 is an NPN type regulator and doesn't require input or output capacitors (memory serving.) It's stable under almost any condition as it uses a Darlington emitter follower arrangement with voltage gain near unity and the current gain high, which doesn't introduce any low freq poles into the loop gain. Dominant pole compensation is really easy so external compensation isn't needed. | |
| Sep 7, 2022 at 13:15 | comment | added | Marcus Müller | MAX485 sounds like the opposite of "minimal consumption"? RS485 implies a rapidly changing, many-mA bus draw? And at the price of a single MAX485, why are you eager to save 4ct on ceramic capacitors? | |
| Sep 7, 2022 at 13:05 | history | asked | Erick.87 | CC BY-SA 4.0 |