利用TL494设计的升压电路
15脚通过两个10K电阻分压Vref，则15脚的输入为2.5V
16脚为输出电压反馈，通过150K和7.5K分压，实测输出电压为32V，实测16脚的输入电压为1.5V
那既然误差放大器（无负反馈）的两端不一样，那误差放大器的输出该很大吧，应该是多少，输出占空比我怎么就算不明白了呢
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