103AIW ST DATASHEET PDF
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When it reached around 23V, the output changed. You want a 5V output voltage and have a 2.
Now, suppose your output voltage keeps raising and reach 5. It’s now time to actually modify the notebook PSU. That’s pretty close to the 2.
A simple variable power supply based on the LM These steps keep repeating, maintaining the output voltage at the desired value. Nice, but what is what on this power supply? As the current flows dztasheet the capacitor, the output voltage starts to rise. If R2 is 1kOhm, you have: The voltage divider I wanted was connected to pin 2 of the comparator IC. This is the feedback circuit telling the control circuit to stop charging the output capacitor. 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.
Almost every SMPS feedback circuit works by dividing the output voltage using a voltage dividerthen comparing the divided voltage with a reference voltage.
103ai a member to follow this project and never miss any updates. Does this project spark your interest? Well, it’s actually pretty easy to identify each part.
S9012 . Datasheet. Equivalente. Reemplazo. Hoja de especificaciones. Principales características
Did’nt bother much more due to the PCB being covered in thermal glue hiding the circuit. Without load, voltage is stable???
Modifying a notebook power supply Modification of a notebook power supply to output a desired voltage. Nice, but how do we identify the voltage divider?
I wiped my 103aie and the images got broken. The comparator gets the value and compares it to the voltage reference. This finishes the explanation of how a SMPS works.
TSMWAIDT=AIW – ST – IC Chips – Kynix Semiconductor
It’s done, now your power supply outputs the desired voltage. No blue magic smoke. Yes, delete it Cancel. But when I connect even very small load, it shuts off.
Any clue what could be the cause? Become a member to follow this project and never miss any updates Become a member.
Modifying a notebook power supply
About Us Contact Hackaday. Now, with a basic understanding of how a SMPS works, there should be no problem modifying one to output our desired voltage.
Grabbed my multimeter and adtasheet the output: There’s no real secret to that. It’s easy to see where the inputs are. 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.
Using the continuity test, I found the resistors to be R40 and R