TI中文支持网Part Number:TPS54202
The under voltage lock out (UVLO) can be adjusted externally using R4 and R5. The EVM is set for a start voltage of 6.74 V and a stop voltage of 5.83 V using R4 = 510 kΩ and R5 = 105 kΩ.
上面是英文PDF内容当要求8V使能时，Vstart与Vstop是怎么确定的？
FRANK1：
感谢您对TI产品的关注！关于你的咨询， 你用下面帖子里的excel计算下。
e2e.ti.com/…/tps54202-uvlo-calculation-help-for-en-pin
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? ?：
感谢您的回复，我也是用EXCEL进行计算的，但不明白的是为什么输入电压是8V时，Vstart=6.74 V，Vstop=5.83
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FRANK1：
这可能与当初EVM设计时，设定的典型值有关。并不是特定的。
下面是我找到的一些信息。
I did not personally design that EVM, but it is not uncommon to have restricted input voltage range. In this particular case, it has to do with the external UVLO set by R4 and R5. The typical start voltage is 6.74 V and the stop voltage is 5.83 V typical. So once the circuit is started ,the input voltage can drop down below 6 V (see the line regulation chart of figure 4). So with tolerances, and those particular UVLO settings, an 8 V input voltage minimum specification seems reasonable. You can modify the EN resistors R4 and R5 to lower the input voltage range.
the ULVO has been externaly fixed on the EVM.
