LMR60430-Q1: How does the chip recognize the output operating mode and configure?

Dear team,

As we known, the LMR60430-Q1 device can be configured to operate in either fixed or adjustable output voltage modes. For fixed output voltages, simply connect the output voltage rail directly to the FB pin. When other output voltages are required, a resistor divider between the output voltage rail and ground with the FB pin as the center point set the output. 

My question is: How does the inside of the chip identify the current operating mode and FB pin connection? How are the internal circuits configured in different modes?

Thanks!

Regards,

Nora

Daniel：

您好

如图所示内部存在相关设计，可以满足您固定和可调的需求。

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Nora Wan：

您好，这个内部设计图我在datasheet上已经找到，请问可以具体描述一下FB引脚是如何识别固定和可调的吗？

,

Daniel：

您好

如您看到的FB脚内部有相关设计，如果您直接将接到FB脚时，内部如图设计部分保证了固定电压的反馈分压。如果您在接到FB前进行电阻分压，那么在设计过程中变成可调部分，内部设计成分压的一部分。