| Electronics > Projects, Designs, and Technical Stuff |
| Disable or trick pulse-skipping/skip-cycle/eco-mode |
| (1/3) > >> |
| b_force:
I have here a power supply with a NCP1239. I am pretty happy with the overall design around this chip, except for the fact that it goes into some kind of "eco-mode" with light loads. Unfortunately this is causing all kinds of noise issues in my design (which has a dynamic load). Before I go for a different power supply, I was wondering if this mode can be tricked somehow? I am fine trading in some efficiency for this obviously. I have been searching and looking around for a bit, but can't really find any satisfying solution so far. (for the record, I am skilled in working with main voltages and designing similar designs myself, so I am only just asking for a solution to disable this mode) |
| Wimberleytech:
--- Quote from: b_force on May 22, 2019, 02:47:11 pm ---I have here a power supply with a NCP1239. I am pretty happy with the overall design around this chip, except for the fact that it goes into some kind of "eco-mode" with light loads. Unfortunately this is causing all kinds of noise issues in my design (which has a dynamic load). Before I go for a different power supply, I was wondering if this mode can be tricked somehow? I am fine trading in some efficiency for this obviously. I have been searching and looking around for a bit, but can't really find any satisfying solution so far. (for the record, I am skilled in working with main voltages and designing similar designs myself, so I am only just asking for a solution to disable this mode) If you are willing to sacrifice some efficiency, just add a fixed load. Not so pretty, but it will address the problem. Most likely you have thought of this and have reason not to do it. --- End quote --- |
| b_force:
--- Quote from: Wimberleytech on May 22, 2019, 03:15:30 pm --- --- Quote from: b_force on May 22, 2019, 02:47:11 pm ---I have here a power supply with a NCP1239. I am pretty happy with the overall design around this chip, except for the fact that it goes into some kind of "eco-mode" with light loads. Unfortunately this is causing all kinds of noise issues in my design (which has a dynamic load). Before I go for a different power supply, I was wondering if this mode can be tricked somehow? I am fine trading in some efficiency for this obviously. I have been searching and looking around for a bit, but can't really find any satisfying solution so far. (for the record, I am skilled in working with main voltages and designing similar designs myself, so I am only just asking for a solution to disable this mode) --- End quote --- If you are willing to sacrifice some efficiency, just add a fixed load. Not so pretty, but it will address the problem. Most likely you have thought of this and have reason not to do it. --- End quote --- Obviously I have, the problem is that this fixed load has to be pretty big to get out of this eco mode. Wasting around 1A around 24V. A little bit to big to my liking, so I was wondering if there other ways to do this? |
| Wimberleytech:
Going into skip mode below 1A doesn't feel right. 1A is not "light load" |
| b_force:
--- Quote from: Wimberleytech on May 22, 2019, 03:33:01 pm ---Going into skip mode below 1A doesn't feel right. 1A is not "light load" --- End quote --- Well, around 1A it goes into a lower frequency, around 20kHz which is causing a lot of noise issues. Going down to around 500mA and this frequency is even lower. With no load it's completely unusable, go to around 4-5kHz or thereabouts. This power supply can deliver around 150W, so I guess 24W is considered a light load? |
| Navigation |
| Message Index |
| Next page |