LDO与DCDC问题（Some questions about LDO and DCDC）

大家好：

        DCDC和LDO用作电源芯片时，DCDC和LDO的可调版本（ADJ）都是通过电阻分压来获得反馈引脚的电压，但是为什么两者的计算方式不一样呢。

Vout=Vref*（1+R1/R2）

对于DCDC而言，R2是对地电阻；对于LDO而言，R1是对地电阻。

谢谢。

Hello everyone:

         When DCDC and LDO are used as power chips, the adjustable versions of LDO ， DCDC  are all voltage dividers to obtain the feedback pin voltage, but why both are calculated in different ways.

Vout=Vref*(1+R1/R2)

For DCDC, R2 is the resistor connected to GND; for LDO, R1 is the resistor connected to GND.

Thanks.