| Electronics > Beginners |
| Understanding a flyback circuit PWM controller |
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| gkmaia:
I got a power supply with feedback circuit that does not feature an optocoupler and has been reverse engineered on my coloured sketch. Attached there's another circuit, similar that makes use of a TOP100. I my case my circuit uses a Panasonic MIP 2E3DMY PWM Switch. On 2E3DMY Control voltage is 10V. If on both cases when the voltage on the control capacitor exceed the PMW control voltage the current will flow into the control pin that will set decrease the duty cycle. With that in mind I have a question. What would happen if I replace my PMW by one with a control voltage off 8v? |
| Wimberleytech:
Your schematic makes my head hurt. |
| gkmaia:
--- Quote from: Wimberleytech on February 10, 2019, 11:30:28 pm ---Your schematic makes my head hurt. --- End quote --- there you go! |
| Yansi:
Yes, the schematic is childish. But, to answer your question: Replacing it with an IC with lower reference would (surprise!) result in lower output voltage, proportionally. But... do NOT! swap those ICs, as they may and will have different peak current limits and frequency of operation. |
| gkmaia:
--- Quote from: Yansi on February 13, 2019, 02:01:51 am ---Yes, the schematic is childish. But, to answer your question: Replacing it with an IC with lower reference would (surprise!) result in lower output voltage, proportionally. But... do NOT! swap those ICs, as they may and will have different peak current limits and frequency of operation. --- End quote --- The reason the schematic looks like that is it because it is just an x-ray overlay of the current circuit made with Sketch (UI tool). Colours are just to help identifying the nodes. I could then translate it to a proper schematic using a proper EE tool but is it worth the time?! No I wont swap those. I was just trying to understand if my logic was right. When you say different frequencies what you mean? They both output at 100Khz. Are you talking about the restart frequency which is 2 and 1.2hz? Thanks for the help! |
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