Patent ID: 7639050

Claim:
A load-drive controller for controlling a drive of a load by setting a load current to be a desired current to be applied to the load, said load-drive controller comprising: a voltage source for obtaining a reference voltage which is equivalent to a setting current of the desired current; an H bridge circuit comprised of output transistors for controlling the drive of the load; a first comparing unit for comparing a value of a load current supplied from the H bridge circuit and the desired current value of the setting current; a PWM control unit for generating a control signal to control the load current; an output drive unit for driving and controlling the output transistors of said H bridge circuit based on the control signal; and a load current monitoring unit for determining which is larger: a level shifted value of the setting current or a peak hold value of the load current, wherein said PWM control unit controls increase or decrease of the load current based on a comparison result of the first comparing unit and a determination result of the load current monitoring unit.