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Similar projects worth following. 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. We’ll need to open it, identify the feedback circuit and change the reference voltage divider.

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But how does this feedback circuit, which is the one we want to modify, actually works? Some undervoltage protection, or??? A simple variable power supply based on the LM The half of it is 2. Using the continuity test, I found the resistors to be R40 and R I didn’t have any good values to change only one resistor of the divider, but I’ve found that R42 and R43 unpopulated at the time were in parallel to R Now, with a basic understanding of how a SMPS works, there should be no problem modifying one to output our desired voltage.



Modifying a notebook power supply

Now that we’ve found our feedback circuit, it’s time to search for the voltage divider we want to modify. 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. You can see the positive and negative outputs, the main controller comparator and reference voltage and the connection to the control circuit, through the optocoupler.

Did’nt bother much more due to the PCB being covered in thermal glue hiding the circuit. The name “switching” comes from this switch. The voltage divider divides the output voltage by a known constant and feed it to a comparator. I wiped my webserver and the images got broken.

When the feedback circuit senses the output voltage is at the desired value, it tells the control circuit to stop charging the capacitor.

Having the datasheet of the comparator in hands always helps. It’s now time to actually modify the notebook PSU.

AIW(ST,SOP8), DataSheet|Picture – Electronic Parts – Censtry Electronics Co.,Ltd.

I have the same problem like David with modifying 20V Fujitsu Siemens laptop power brick. Notice how it charges then discharges the capacitor.

Become a member to follow this project and never miss any updates. Also, when I changed the voltage on the variable power supply, I could see the voltage on pin 2 changing according to it.


TSMWAIDT=AIW – ST – IC Chips – Kynix Semiconductor

I’ve already identified the main parts on the feedback circuit. If we compare this voltage divider to the one at the previous post, R40 is R1 and R41 is R2. The oscillating start only with load. Your comparator will tell you if a value is higher or lower datsheet 2. You should Sign Up. You want a 5V output voltage and have a 2.

Well, it’s actually pretty ratasheet to identify each part. As the current flows into the capacitor, the output voltage starts to rise. 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. Let’s first understand how a switching power supply works.

Modifying a notebook power supply Modification of a notebook power supply to output a desired voltage. Testing pin 3 I’ve read 2. When nothing connected it is 28V what is modified to be.

This project was part of my Soldering Station project. When it reached around 23V, the output changed.