| 摘要 |
PROBLEM TO BE SOLVED: To suppress pulsation of load current by performing accurate current control when constant current control is performed by repeating charge/ discharge of a current for a reactance load through an H bridge circuit mounted on an IC. SOLUTION: The semiconductor integrated circuit comprises an H bridge circuit for driving a coil load L being connected with a pair of external output terminals 15 and 16, a PWM control circuit 20 for driving the switching of output switch elements 11-14 in the H bridge circuit with a PWM signal and setting a charge mode, a low speed attenuation mode or a high speed attenuation mode of the H bridge circuit selectively for the load, a first current detection circuit 21 for detecting a load current dropping below a first set level in high speed attenuation mode for the load, and an output control logic circuit 23 for controlling a PWM control circuit by receiving a detection output from the first current detection circuit 21 and generating a control signal for making a switch to the low speed attenuation mode. |
