So I designed a generic buck converter (with microcontroller feedback) for battery charging application. I also added voltage and current sensors. My concern is that when I don't apply any input to my buck converter and then attach the 12 V lead acid battery to the output, the battery voltage can be measured at the buck converter input even when the MOSFET is off!
It's like the output is going to the input. However, when I apply like 20 volts to the input and run the algorithms such as constant voltage and constant current, the circuit behaves as it should, meaning I can supply the battery with constant current or constant voltage.
Even though this is working... my concern is that the output voltage that is being transferred to the input voltage (when no input is applied) may damage some ICs, specifically the output current sensing IC since that is the only one giving me funky values. So is this normal or is something wrong with my design?
I can supply the circuit schematic but even though it's not a big circuit, it's still spread out in like 5 pages. Let me know what other info you guys might need.
It's like the output is going to the input. However, when I apply like 20 volts to the input and run the algorithms such as constant voltage and constant current, the circuit behaves as it should, meaning I can supply the battery with constant current or constant voltage.
Even though this is working... my concern is that the output voltage that is being transferred to the input voltage (when no input is applied) may damage some ICs, specifically the output current sensing IC since that is the only one giving me funky values. So is this normal or is something wrong with my design?
I can supply the circuit schematic but even though it's not a big circuit, it's still spread out in like 5 pages. Let me know what other info you guys might need.