Timeline for Problems with TL494 boost converter
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 24, 2021 at 14:49 | comment | added | Anton | Let us continue this discussion in chat. | |
| Dec 24, 2021 at 14:20 | comment | added | Andy aka | You should also read the data sheet notes about adding a compensation capacitor around R5 and R6 - you should then find that you can run with more precision because R6:R5 can increase and give you improved regulation. | |
| Dec 24, 2021 at 14:14 | comment | added | Anton | Side note: I found out that R5 and R6 are actually necessary. If I remove them and connect pins 2 & 15 directly to Vref, the same behavior happens as if the divider was after the LC filter. Although with R5 and R6 the output voltage drops slightly under load because pin 3 voltage decreases under load, and R5 and R6 act like a voltage divider. So, increasing their ratio is the way to go. | |
| Dec 24, 2021 at 8:01 | comment | added | Andy aka | That's great news. | |
| Dec 24, 2021 at 7:23 | comment | added | Anton | Great, thanks again for the tips. I forgot to mention it, but moving the divider worked just fine | |
| Dec 24, 2021 at 7:22 | vote | accept | Anton | ||
| Dec 23, 2021 at 21:55 | comment | added | Andy aka | Compensation is normally needed without the extra LC filter. I suggest you move the divider. | |
| Dec 23, 2021 at 21:12 | comment | added | Anton | I wasn't aware of the fact that my divider placement is incorrrect - thanks so much for pointing it out. Do I understand correctly that I need to compensate pin 3 with a capacitor in addition to R5 and R6, as well as use values closer to 510 Ohms and 51K given in the TI note I linked? If so, could you please suggest a value for the capacitor? | |
| Dec 23, 2021 at 20:45 | history | edited | Andy aka | CC BY-SA 4.0 |
added 382 characters in body
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| Dec 23, 2021 at 19:32 | history | answered | Andy aka | CC BY-SA 4.0 |