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UC3843升压过程中为什么一接负载电压就马上掉了2V

Other Parts Discussed in Thread: UC3843

我用UC3843做一个升压电路时由18V升到35V电路,没接负载时就是35多一些,然后一接负载电压就直掉2V,接的负载是一个很小的负载我测了下空载与负载的PWM波的波形。