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This finishes datasueet explanation of how a SMPS works. Your Password Forgot your password? If R2 is 1kOhm, you have:. We’ll need to open it, identify the feedback circuit and change the reference voltage divider.

Let’s first understand how a switching power supply works. Consider the output voltage at 19V and calculate the divider, you get around 2. I wiped my webserver and the images got broken. Did’nt bother much more due to the PCB being covered in thermal glue hiding the circuit.

Having the datasheet of the comparator in hands always helps. These steps keep repeating, maintaining the output voltage at the desired value. When the feedback circuit senses the dataheet voltage is at the desired value, it tells the control circuit to stop charging the capacitor. The comparator will now tell the control circuit to stop charging the capacitor.

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It’s easy to see where the inputs are. Become a member to follow this project and never miss any updates Become a member. The image below xatasheet a real SMPS maintaining it’s output voltage. Using a voltage divider. There was one problem, though: Let’s use a R2 as 1kOhm and calculate R1 to make our voltage divider.


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If the value is higher than the voltage reference, the comparator tells the control circuit to open the switch, as your output voltage is over the desired value.

View all 3 project logs. Test the power supply with a variable voltage power wt.

I managed to get up to As datashheet 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. Using the continuity test, I found the resistors to be R40 datashete R I reconnected the variable power supply and changed the voltage while measuring the output at the optocoupler. Already have an account? Yes, delete it Cancel. It will deliver up to ma of current with current limiting.

The feedback circuit notices this and, satasheet the voltage is below the threshold, it tells the control circuit so, which closes the switch again. When nothing connected it is 28V what is modified to be. Nice, but what is what on this power supply?

This project was part of my Soldering Station project. The part closest to the AC power cord is the input high voltagethe middle part is the control circuit high voltage and the part closest to the DC output is the feedback circuit low voltage.

Any clue what could be the cause? Notice how it charges then discharges the capacitor. That helps a lot. Suppose your output voltage was at fatasheet. I connect the variable power supply to the power supply I want to modify and measure the voltage at the optocoupler.


A simple variable power datashwet based on the LM I’ve replaced the 22k with 27k since I did not have 28k available and the output voltage is a bit above 23V which is enough for me.

This is the feedback circuit telling the control circuit to stop charging the output capacitor. The half of it is 2. All good, but the capacitor starts discharging over time, and so the daasheet voltage starts to drop. SMPS are much more complex, but this is enough to give a good understanding on the theory of operation. There are two clear divisions on this circuit board, the rubber pads are even marking it, along with silkscreen and areas without components.

It was not that precise, but well, there it was. Does this project spark your interest?

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There are lots of resistors, how would we know which are the ones we are looking for? Grabbed my multimeter and tested the output: The Hackaday Prize. Your comparator will tell you if a value is higher or lower than 2.

There’s an easy way to identify them.