| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply controller having a protection range similar to that of a mechanical blowout fuse, with a simple configuration.SOLUTION: When an electrification path is in abnormal state, an electrification path protection circuit of a power supply controller prohibits electrification of a switch circuit by using a protection current temperature characteristic line Lpr set by a characteristic setting circuit. Data for adjusting the protection current temperature characteristic line is stored in a nonvolatile memory. The protection current temperature characteristic lines (Lpr1-Lpr3) have negative characteristics where the protection current amount is constant or decreases as the environmental temperature To increases. In a temperature region equal to or below the assumed maximum environmental temperature Tosumax in a place where electrification path is located, the protection current temperature characteristic lines (Lpr1-Lpr3) and an electrification path temperature characteristic line Lw have such a relation that the protection current value is equal to or smaller than the allowable current value by an electrification path temperature characteristic line Lw for the same environmental temperature To. |
