| 摘要 |
According to one embodiment, a design support apparatus determines one of a first impedance between a power plane and a ground plane in the printed circuit board at an ON time of a high-side transistor in the switching power supply, a second impedance between the power plane and the ground plane at an ON time of a low-side transistor in the switching power supply, and a third impedance in an intermediate range between the first impedance and the second impedance to be an impedance between the power plane and the ground plane, based on ON-time information indicative of a ratio of an ON period of the high-side transistor to a switching cycle of the switching power supply in an operation period of the device. The apparatus evaluates capacitor information included in design information of the printed circuit by comparing the determined impedance and a target impedance.
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