Modern motor control technology has developed fast and made rapid progress these days. Actuators driven by DC motors are widely used in R&D processes of series projects in which the author participated. In these projects,the pulse width modulation(PWM)mode has played an important role in DC motor control. In this article,several working conditions of PWM driver chip UC2637 used in electrical actuator are discussed. Its flexible application in similar occasions is expected .% 现代电机控制技术日新月异，发展很快。在从事研制开发的多个型号课题中应用了直流电动舵机，而其核心部分直流电机控制方式又多采用脉冲调宽方式，对电动舵机脉冲调宽驱动芯片UC2637工作方式中的几种情况给予讨论，希望对其能够灵活运用，并可推广到其他的使用情况中去。
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