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For the R42, I’ve put a single 10kOhms resistor. Your Email Remember me.

Shipping 103AIW TSM103AIW Free constant current driver SOP-8 IC

It’s done, now your power supply outputs the desired voltage. Already have 13aiw account? But when I connect even very small load, it shuts off.

It will deliver up to ma of current with current limiting. I’ve already identified the main parts on the feedback circuit.

AIW Datasheet, PDF – Datasheet Search Engine

What we want to do is to change the voltage divider, changing the voltage at which the comparator tells the control circuit to charge the capacitor. The idea behind it is modifying a datashet 65W notebook power supply to output 24V. If we compare this voltage divider to the one at the previous post, R40 is R1 and R41 is R2. It’s now time to actually modify the notebook PSU.


A sr view of the optocoupler: Consider the output voltage at 19V and calculate the divider, you get around 2. Uploaded everything to hackaday. You are about to report the project ” Modifying a notebook power supply “, please tell us the reason. You’ll need to make 5V looks like 2.

datasheeg There’s no real datadheet to that. We’ll need to open it, identify the feedback circuit and change the reference voltage divider. Feedback circuit working like a charm. I have the same problem like David with modifying 20V Fujitsu Siemens laptop power brick.

This is the feedback circuit telling the control circuit to stop charging the output capacitor. There’s an easy way to identify them. The Hackaday Prize. As the current flows into the capacitor, the output voltage starts to rise. That’s pretty close to the 2. The half of it is 2.

You should Sign Up. Also, when I changed the voltage on the variable power supply, I could see the voltage on pin 2 changing according to it. Some undervoltage protection, or??? 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. There are two clear divisions on this circuit board, the rubber pads are even marking it, along with silkscreen and areas without components.


Without load, voltage is stable??? Calculating for 24V, the divided voltage would be 2.

The feedback circuit notices this 130aiw, when the voltage is below the threshold, it tells the control circuit so, which closes the switch again. Has anyone solved this problem? The comparator will notice that 2.

It’s a great xt. It was not that precise, but well, there it was. View all 3 project logs. The problem was somewhere else. But how does this feedback circuit, which is the one we want to modify, actually works? 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.