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TPS5430 不能实现短路打嗝

根据这电路是设计的,输入10V左右,输出设计的是6.9V。做短路测试不能进入打嗝状态,输入有0.4A左右的电流,芯片和电感发热严重,测试了输出波形,没有进入打嗝状态,看到只是占空比非常小。请问怎么解决!感谢!