MOTOR DRIVE CIRCUIT, COOLING DEVICE EMPLOYING THE SAME, AND ELECTRONIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To set a relation of input and output duty ratios while suppressing increase in cost and area.SOLUTION: A PWM input terminal receives an input PWM signal Shaving an input duty ratio INDUTY. A duty/digital converter 102 converts the input PWM signal Sinto a first digital value Dcorresponding to the duty ratio INDUTY. An inclination setting terminal SLP receives information indicating an inclination SLP of an output duty ratio OUTDUTY of a motor drive circuit relative to the input duty ratio INDUTY. An inclination acquisition section 104 acquires a second digital value Dcorresponding to the information indicating the inclination SLP. A duty calculation section 108 generates a duty command value Dthat linearly increases the first digital value Dwith the inclination corresponding to the second digital value D. A digital pulse width modulator 110 generates a control pulse Shaving the output duty ratio OUTDUTY corresponding to the duty command value D.