系统输入电压是24V，我们打算用TPS5430将其转为5V，再用这个5V供给TPS65218以带动am4378及其最小系统。
这种两级降压，是不是不用怎么考虑第一级开关电源的输出纹波？或者虽然要考虑，但是具体到本方案依然可行的，因为TPS65218对输出电压的要求比较糙?
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