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TPS54231 无法让12V的硬盘电机转动....

Other Parts Discussed in Thread: TPS54231, TPS54160A

你好:
我使用一个24V5A的开关电源.当做电压输入, 送入TPS54231 的电路(如下)..输出电压约为11.89V

接入3.5寸7200rpm的硬盘12v 在用另外一棵5v2a的开关电源送出5v输入到硬盤的5v

但硬盘无法转动....

但替换掉tps54231,改用另一棵12v2a的开关电源送入硬盘..可顺利启动硬盘转动并且正常读取.

请问这是什么原因呢?

以下为tps54231电路: