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LM5175高端MOS驱动问题求教

Other Parts Discussed in Thread: LM5175

本人现在在使用LM5175做一个buck-boost电路,12V~42V输入,20V输出,接了十来欧姆的负载,开关频率300k。升压的时候,右边高端管可以常通(驱动波形是一条直线);但降压的时候,左边高端常通管却不能常通(每两个周期驱动信号要往下掉一小段时间,然后再升回去),是因为bootstrap电容不够电了要充电么?这已经影响到SW节点波形以及电感电流形状了。