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That helps a lot. Any clue what could be the cause? As the current flows into the capacitor, the output voltage starts to rise. The half of it is 2.

103aie nothing connected it is 28V what is modified to be. The control circuit then closes the switch, allowing current to flow from the high voltage side to the low voltage side. Now, suppose your output voltage keeps raising and reach 5. This will be explained in the et post.

As you want a specific voltage on the output low voltage sidethe feedback circuit tells the control circuit that the output voltage is below the desired voltage. Has anyone solved this problem? Let’s use a R2 as 1kOhm and calculate R1 103aw make our voltage divider. Already have an account? You should Sign Up. There are lots of resistors, how would we know which are the ones we are looking for?

Similar projects worth following. I’ll try to show in a very simplified way how a switch mode power supply works and how to change the feedback circuit so the power supply outputs the voltage you want. Nice, but how do we identify the voltage divider? Your Password Forgot your password? There’s an easy way to identify them. It will deliver up to ma of current with current limiting. Description This project was part of my Soldering Station project, but I’ve decided to make it a standalone project, as it’s a little more detailed than I intend to detail the rest of the Soldering Station project.


Having the datasheet of the comparator in hands always helps. These steps keep repeating, maintaining the output voltage at the desired value. Feedback circuit working like a charm. I’ve already identified the main parts on the feedback circuit. Else, if the value is lower than the voltage reference, the comparator tells the control circuit to keep charging the capacitor, because your output value is lower than the desired value. Now, with a basic understanding of how a SMPS works, there should be no problem modifying one to output our desired voltage.

The only problem I could think was the current flowing to the comparator through the optocoupler, so I changed the old Ohms resistor to a 1kOhms resistor and tested the the circuit again. We’ll need to datashet it, identify the feedback circuit and change the reference voltage divider. The feedback circuit notices this and, when the voltage is below the threshold, it tells the control circuit so, which closes the switch again. I wiped my webserver and the images got broken.

I connect the variable power supply to dtaasheet power supply I want to modify and measure the voltage at the optocoupler. Just when it’s about to reach 18V 19V 103auw 1Vthe voltage suddenly drops to 3V. The oscillating start only with load. When you turn on the power supply, the switch is open and the capacitor is discharged, at 0V.


Let’s first understand how a switching power supply works. The original values were 15kOhms for R40 and 2. The voltage divider divides the output voltage by a known constant and feed it to a comparator. There are two clear divisions on this circuit board, the rubber pads are even marking it, along with silkscreen and areas without components. When it reached around 23V, the output changed.

It was not that precise, but well, there it was.

AIW – ST – IC Chips – Kynix Semiconductor

The comparator will now tell the control circuit to stop charging the capacitor. You would be comparing the half of 4.

Suppose your output voltage was at 4. It’s easy to see where the inputs are. This is the feedback circuit telling the control circuit to stop charging the output capacitor.

Well, it’s actually pretty easy to identify each part. This finishes the explanation of how a SMPS works.

The comparator gets the value and compares it to the voltage reference. I think is DAP8A some protection. But how does this feedback circuit, which is the one we want to modify, actually works?