The IMONOUT pin have two functions in reverse current operation. The first function is that the pin can be used to monitor the reverse current value when the average current limit feature is not enabled. In this case, a pulldown resistor is needed between IMONOUT pin and GND. The second function is that this pin is also used to provide a compensation to an average current limit loop to limit the reverse current. In this case, a compensation network is required at IMONOUT pin.