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PWM控制器UC3825

推挽式的PWM控制器,例如UC3825,soft-start是怎么一回事啊?

  • 在电源启动时,输出电压一般为0。采集输出电压反馈进入反馈环的话会一直输出最大占空比,这样在输出达到理想值时电感电流会很大,形成输出电压过冲。 所谓soft start,一般就是在芯片侧连个电容,启动时对电容缓慢充电,用电容上电压作为REF,从而使得启动时输出波形平滑。