LOAD-PROTECTION CIRCUIT USING AN FET IN A DISK DRIVE USING MULTIPLE POWER, SPECIALLY CORRELATED TO REDUCING THE SIZE OF A DISK DRIVE BOARD BY PROTECTING A LOAD FROM AN EXCESSIVE VOLTAGE BY USING A LOW-PRICED FET

摘要

PURPOSE: A load protection circuit using an FET in a disk drive using multiple power is provided to protect a load from an excessive voltage by using a low-priced FET when the excessive voltage is applied, thereby reducing an increase in the unit cost while decreasing the size of a disk drive board. CONSTITUTION: The first and second power input terminals receive the first and second powers. When the second power is applied through the first power input terminal, a power controller controls the applied power to supply a power which is less than the first power to a load. The first power input terminal is connected to a drain terminal of an MOS FET, while the second power input terminal is connected to a gate terminal of the MOS FET. The load is connected to a source terminal of the MOS FET.