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TPS54335A,12V输入,3.3V/3A输出有拉钩现象

Other Parts Discussed in Thread: TPS54335A

使用TPS54335A做一个12V转3.3V给LTE模块供电(峰值需求电流在2.5A左右),设计参照TI提供的设计,电感为15uH,COMP的参数与参考设计一样。测试发现在输出带载和关掉负载时都有拉钩现象,将输出电容增加到100uf(全部贴片)情况还是一样。请问有什么什么解决的办法。