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MC33063外置NPN三极管如何使其压降最小



在使用MC33063降压模式下,最小收入电压为21V 额定输出15V 在不外加三极管使 可以带负载0.5A  输出电压为14.87V 。外置三极管带0.6A负载,输出电压反而小于14V,应该是三极管的压降太大,请问如何减小三极管导通的压降呢,然后分析这个电路,三极管使没有办法进入深度饱和区的