| 摘要 |
PROBLEM TO BE SOLVED: To shorten the test time of an output voltage switching test of a voltage regulator.SOLUTION: A register 3 outputs a digital output voltage switching signal Dp to a D/A conversion circuit 9 of a voltage regulator 8. A stabilization wait circuit 4 inputs the output voltage switching signal Dp as a digital voltage signal S10 via the D/A conversion circuit 9 and A/D conversion circuit 10; determines whether or not the digital voltage signal S10 is stabilized within a maximum stabilization wait time; outputs, if the digital voltage signal S10 is stabilized within the maximum stabilization wait time, a digital voltage signal Da at the stabilization timing; and outputs, if the digital voltage signal S10 is not stabilized within the maximum stabilization wait time, the digital voltage signal Da when the maximum stabilization wait time has elapsed. When the digital voltage output signal Da does not match the output voltage switching signal Dp, a test control circuit 6 outputs a test result signal S6 indicating the voltage regulator 8 does not operate correctly. |
