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。
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