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关于TL494为什么脉宽一直很大而无法改变的问题?



为何一上电输出占空比达到最大,测得为87%,当外部电压加到第2引脚时没有输出PWM波,只有2脚电压达到约5V时才输出PWM波,且为最大占空比,升高2脚电压,占空比维持不变。