我看到许多论文介绍UC3842电压反馈回路的接法为:
可是根据UC3842的芯片资料UC3842误差放大器的拉电流最大只有1mA。加上芯片内的1mA恒电流源也仅仅能提供2mA的拉电流。PC817不可能正常工作啊!
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我看到许多论文介绍UC3842电压反馈回路的接法为:
可是根据UC3842的芯片资料UC3842误差放大器的拉电流最大只有1mA。加上芯片内的1mA恒电流源也仅仅能提供2mA的拉电流。PC817不可能正常工作啊!