Other Parts Discussed in Thread: CSD18532KCS, CSD18502KCS, UCC27211, CSD18502Q5B, CSD18532Q5B, CSD18540Q5B, CSD18531Q5A
I am trying to implement a slightly different version of the TIDA-0120 charge controller that will support up to 40A charging current and I have some questions I hope someone can help me with.
- What actually defines the max charging current? Is there a current limiting mechanism in the MSP430 FW that defines the max charging current?
- You have a hint in the board description that although the design is for 20A, up to 40A could be possible by choosing a different MOSFET package. I thus intend to use CSD18532KCS and CSD18502KCS in TO-220 case, but with heatsinks. Do you find this a good enough choice?
- Apart from the MOSFETs I also have some concerns regarding the two 10uH inductors, L1 and L2. If I understand the circuit correctly, these should also be exposed to the full extent of the charging current. I guess I have to change the inductors as well, and choose some that can go up to 40A? Problem is of course that I cannot find 10uH / 40A inductors. Perhaps I could decrease the inductance and then increase the capacitance of the filter (C3, C9, C8)?
- What about R2 (and R1 potentially)? Don't I have to find another sense resistor that doesn't overheat with 40A? If I'm not mistaken, the existing one is right at the border.
- Any other component I should consider with the increased current?