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LM3406Vsns不正常

Other Parts Discussed in Thread: LM3406

问题描述:我用四路LM3406驱动LED灯,从原理图到布局走线几乎都是一模一样,但是实际测试过程中,左侧两路能输出正常电流0.715A,右侧两路只有0.18A,示波器测Rsns两端电压不正常,见下图,我焊了两块板出现了同样的问题,LED灯没有问题,怀疑是否LM3406受干扰导致Vsns采样异常?

正常状态下Rsns两端波形:

非正常状态下Rsns两端波形:

实物图:

原理图: