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The comparator will now tell the control circuit to stop charging the capacitor. If R2 is 1kOhm, you have: I managed to get up to 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.

Testing pin 3 I’ve 103aaiw 2. Let’s have a look at the open PSU: The image below is a real SMPS maintaining it’s output voltage.

This is the feedback circuit telling the control circuit to stop charging the output capacitor. When you turn on the power supply, the switch is open and the capacitor is discharged, at 0V.

It’s done, now your power supply outputs the desired voltage. Has anyone solved this problem? I think is DAP8A some protection. You are about to report the project ” Modifying a notebook power supply “, please tell us the reason.


Did’nt bother much more due to 103aw PCB being covered in thermal glue hiding the circuit.


But when I connect even very small load, it shuts off. This finishes the explanation of how a SMPS works. You should Sign Up. You want a 5V output voltage and have a 2. Grabbed my multimeter and tested the output: Wait at least one minute after disconnecting it from mains before handling it again while open.

Disconnected from the mains, put everything back into the case and tested again to make sure. 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.

Notice how it charges then discharges the capacitor.

AIW – ST – IC Chips – Kynix Semiconductor

Without load, voltage is stable??? Uploaded everything to hackaday. Any clue what could be the cause? As the current flows into the capacitor, the output voltage starts to datashet. Nice, but what is what on this power supply?

There’s an easy way to identify them. If we compare this voltage divider to the one at the previous post, R40 is R1 and R41 is R2. I have the same problem like David with modifying 20V Fujitsu Siemens laptop power brick.

Similar projects worth following. We’ll need to open it, identify the feedback circuit and change 103xiw reference voltage divider.

All good, but the capacitor starts discharging over time, and so the output voltage starts to drop.

The original values were 15kOhms for R40 and 2. This project was part of my Soldering Station project.


【103AIW ST】Electronic Components In Stock Suppliers in 2018【Price】【Datasheet PDF】USA

Now, with a basic understanding of how a SMPS works, there should be no problem modifying one to output our desired voltage. Your comparator will tell you if a value is higher or lower than 2. When the feedback circuit senses the output voltage is at the desired value, it tells the control circuit to stop charging the capacitor. 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.

Using the continuity test, I found the resistors to be R40 and R View all 3 project logs.

AIW Datasheet, PDF – Alldatasheet

It’s a great guide. A better view of the optocoupler: A simple variable power supply based on the LM Suppose your output voltage was at 4. 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. Et, delete it Cancel.

The voltage divider divides the output voltage by a known constant and feed it to a comparator.

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