Timeline for Isolated DC/DC Primary ON/OFF
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 12, 2017 at 13:20 | vote | accept | Shreyas | ||
| Dec 11, 2017 at 16:38 | comment | added | Shreyas | Actually, that's a very nice idea, thank you! This is a one-time board and will be used only by us, and replacing the relays is not a big deal (especially since we need at least one anyway, to cut off all input to the converters). Also, the reed relays I was looking at have way too large of a lifetime to even matter. Nevertheless, I should try to use more things and expand my horizons; thanks for the useful input! | |
| Dec 11, 2017 at 14:41 | comment | added | Randy Nuss | If you don't want to tie the control circuit GND to -Vin, a PS2501 opto-isolator will isolate your RC pin GND (-Vin) from the control circuit GND. In general, we try not to use mechanical relays due to the lower reliability of moving parts. | |
| Dec 11, 2017 at 9:48 | comment | added | Shreyas | - individual relays too. I do have the PMBUS version, but the datasheet clearly says that I should not use the PMBUS enable/disable features ever in a parallel current sharing setup! | |
| Dec 11, 2017 at 9:46 | comment | added | Shreyas | I have separated isolated converters that power a lower voltage 3v3 and 5V control circuits. This part of the circuit is high power and is supposed to be fully under control of the microcontrollers. I know I could just slap on a MOSFET and tie the grounds to -Vin, but this defeats the purpose of the isolation. Which is why I was thinking that I'd use a miniature relay. As for the P suffix modules, in most cases, they are ON when left open, and turn off when pulled low. I already have a relay controlled by the MCU that controls the overall input, but it seems I would need - | |
| Dec 10, 2017 at 23:30 | review | First posts | |||
| Dec 11, 2017 at 0:17 | |||||
| Dec 10, 2017 at 23:28 | history | answered | Randy Nuss | CC BY-SA 3.0 |