The specified input voltage value of the EN (CTRL) pin will not be the same since it is dependent on the supply voltage. When using with IN=3.3V refer to the following graphs in the datasheet. BD6520F and BD6522: Control Input Voltage vs Supply Voltage, BD6524HFV: EN Input Voltage vs Ambient Temperature, and for other models: EN, /EN Input Voltage vs Supply Voltage.
After overcurrent is detected the output switches to a current limited state and the restricted current is output. The output voltage at that time is calculated by 'Overcurrent Limit Value (Short-Circuit Output Current) x Load Resistance Component'. If this condition continues the chip temperature will increase and the thermal shutdown circuit will operate to switch OFF the output. Thermal shutdown is cancelled when the temperature decreases. For the following latch-type models, after overcurrent detection the outgoes to a current-limited state and limited current is output. If this condition continues and the time specified by the /OC output delay time comes, the latch turns OFF and no current is output.
If the switch is turned ON while connected to a load exceeding the overcurrent limit value (short-circuit output current), the output current is limited to the overcurrent limit value and not the overcurrent detection value. Turning ON the load after turning ON the switch makes it possible to output a current over the overcurrent limit value.
. With backflow models, if a higher voltage is supplied to OUT vs IN when the switch is OFF (EN=OFF), current may flow (i.e. through a parasitic diode), which can lead to deterioration and breakdown. If applying a higher voltage to OUT than IN, please use a model that can prevent backflow. Applicable models are described as providing 'reverse current protection while the switch is OFF' in the datasheet.Related Link：Technical Document