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LM5085芯片BUCK电路与LM3485芯片BUCK电路级联问题

Other Parts Discussed in Thread: LM3485, LM5085

现有电压48V,需要用到24V和5V电压,搭了两个BUCK电路。一个用的LM5085芯片,将48V转成24V;另一个用的LM3485芯片,将24V转成5V。两个电路单独工作都没什么问题,但是两个电路连接起来后,出现24V的输出处只有17V左右,5V输出处正常,请问有人遇到过此类问题吗?有什么解决办法呢?