Electrical load driving device

摘要

An electrical load driving device is constructed to accurately detect an over-current state in either a high-side output mode or a low-side output mode irrespective of voltage fluctuations of a load power supply. The over-current is detected by a detection voltage which decreases from a battery voltage in proportion to a current flowing through an output transistor being compared with a determination voltage in the high-side output mode. It is detected by a second detection voltage which increases from a ground potential in proportion to the current flowing through the output transistor being compared with a determination voltage in the low-side output mode.