Hello Team.
I am considering using LM5069-2 as an electronic switch with short circuit protection.
The voltage to be switched ON/OFF is 24VDC (16...32VDC)
The maximum current absorbed by the load is approximately 20A.
The load consists of an inverter for a three-phase asynchronous motor (2200uF bus electrolytic + three-phase MOSFET bridge).
The motor will be started with a certain delay (>500msec) from the OFF-ON switching of the supply voltage.
The electrolytic will be pre-charged with max 1A from a separate and dedicated circuit before switching LM5069-2 ON; pre-charge will start some100msec in advance with reference to OFF-ON switching of the supply voltage.
I will implement the short-circuit protection by mounting a 2mOhm on Rs (threshold current: 24..30A) and a 0.47uF on Ct (22msec of exceeding the threshold current is required to pass to the hiccup phase).
I will switch LM5069-2 ON-OFF by setting UVLO input above/below 2.5V thereshold by a logic gate.
Output PGD will be connected to microprocessor to have some diagnostic feature.
Worst case of use cycle will be more or less as follow: 24V OFF-ON, then inverter starts and runs for 5..10minutes, then inverter stops, then 24V ON-OFF, then 5..10minutes idle, then cycle restart.
The question is: I'm doing everything well? Or I'm missing something important?
Thanks
Bye
Marco
