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求助,关于采用ucc28950的移向全桥整流dcdc输出大电流时驱动占空比不稳的问题

Other Parts Discussed in Thread: UCC28950, INA213

采用ucc28950芯片的移向全桥整流dcdc在输出电压390V,电流1A时,占空比很平稳,当设置输出电流为5A时,参与相移的驱动占空比忽大忽小,请问这种情况应该如何解决????

 

我电流采样电阻选择的是0.005Ω,然后经INA213芯片后在分压到EA-端口。和采样电阻阻值小有关吗?

下图中3为占空比不稳的驱动。