This NTC temperature protection circuit is working in reverse?
Hi, I need help adding external NTC to this charging board I bought here , and the seller is not being really helpfull.
He told me to "desolder" a(?) resistor and connect a 10k NTC, but I think they were talking about a previous model board, so I‘m not sure how to modify my board :
I connected a 10k NTC and it doesn‘t work.
I could not find the IC after hours of searching, and of course the seller said the IC model is trade secret...
After some multimeter probing, I guess it‘s that type of circuit with a constant Vref of 5v.
here is the board behaviour :
Can you see how to modify the circuit to make the NTC work properly? Do you recognise this IC?
Posted Mar 8, 2025, 12:55 PM UTC
10