TI中文支持网TPS54340的datasheet只提到进入ECO-mode模式并且没负载情况下的VIN脚电流是237 μA ,却没提到有轻度负载的情况。请问，假如5.0V输出负载是600uA时，那么VIN脚输入电流是多少？
8.2.1.2.11 Discontinuous Conduction Mode and Eco-mode™ Boundary
With an input voltage of 12 V, the power supply enters discontinuous-conduction mode when the output current
is less than 342 mA. The power supply enters Eco-mode when the output current is lower than 31.4 mA. The
input current draw is 237 μA with no load.
During Eco-mode operation, the TPS54340-Q1 device senses and controls peak switch current, not the average
load current. Therefore the load current at which the device enters Eco-mode is dependent on the output inductor
value. The circuit in Figure 34 enters Eco-mode at about 31.4-mA output current. As the load current approaches
zero, the device enters a pulse-skip mode during which it draws only 146-μA input quiescent current.
Randy Wang：
你好，
可以看到数据手册上我们测得的最小输出电流在1mA，根据输入电压不一样，效率在25-45%，所以你可以估计600uA的时候效率肯定比这个要更差，因为很多仪器已经很难获得这么小的电流，所以一般要用电阻才行。
