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

The comparator will now tell the control circuit to stop charging the capacitor. There are two clear divisions on this circuit board, the rubber pads are even marking it, along with silkscreen and areas without components. SMPS are much more complex, but this is enough to give a good understanding on the theory of operation. You now have a voltage divider which halves your voltage.

Modifying a notebook power supply

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. It’s a great guide. 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.

Just when it’s about to reach 18V 19V – 1Vthe voltage suddenly drops to 3V. I’ve then put two 10kOhms resistors and one 1.



Your Password Forgot your password? Without load, voltage is stable??? It was not that precise, but well, there it was. Similar projects worth following. If we compare this voltage divider to the one at the previous post, R40 is R1 and R41 is Datsaheet. Let’s first understand how a switching power supply works. Become a member to follow this project and never miss any updates. It’s easy to see where the inputs are. The control circuit then closes the switch, allowing current to flow from the high voltage side to the low voltage side.

There was one problem, though: 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 datasheft circuit again. Almost every SMPS feedback circuit works by dividing the output voltage using a voltage dividerthen comparing the divided voltage with a reference voltage. The idea behind it is modifying a 19V 65W notebook power supply to output 24V.

For a step down power supply, that is, a power supply which outputs a lower voltage than you have on the input, you have a switch and a capacitor. This is the feedback circuit telling the control circuit to stop charging the output capacitor.

There are lots of resistors, how would we know which are the ones we are looking for? You want a 5V output voltage and have a 2.

AIW Datasheet, PDF – Datasheet Search Engine

Well, it’s actually pretty easy to identify each part. No blue magic smoke. Suppose your output voltage was at 4. I reconnected the variable power supply and changed the voltage while measuring the output at 10aiw optocoupler. Sign up Already a member? The oscillating start only with load.


Consider the output voltage at 19V and calculate the divider, you get around 2. As the current flows into the capacitor, the datasheeh voltage starts to rise.

There’s an easy way to identify them. View all 3 project logs.

It’s done, now your power supply outputs the desired voltage. But when I connect even very small load, it shuts off.

The images below are purely educational. Disconnected from the mains, put everything back into the case and tested again to make sure.

Testing pin 3 I’ve read 2. The voltage divider I wanted was connected to pin 2 of the comparator IC. Et the power supply with a variable voltage power supply. Now, suppose your output voltage keeps raising and reach 5. The Hackaday Prize. We’ll need to open it, identify the feedback circuit and change the reference voltage divider. How would you do this? Your comparator will tell you if a value is higher or lower than 2.