‘高端’电流检测的必要性？

只看该作者 · 2012-9-7 23:45

The LMP8645 is the right choice in the applications which re-
quires high side current sense, such as High Brightness LED
for automotive where the LED's cathode has to be connected
to the case (ground) of the car. In this case the classical low
side current sense with a shunt resistor connected between
the LED's cathode and the case doesn't guarantee the ground
connection.
请问这种场合下LED负极为什么须要接地？
为什么高端电流检测是必要的？