Current limit in boost converter
With this topology, it's not possible to implement a current limit. See the current path? It's from the Vcc power source through L1 and D1 into the load.

There is no switched element in that path.

To add a current limit, you'd had to add a switch in the current path. Because a conducting MOSFET has lower losses than a diode, it is adviseable to put another MOSFET in instead of the diode D1.







simulate this circuit &ndash; Schematic created using CircuitLab

The path over R_limit and the diode is for preventing T1 and/or T2 to be shot by overvoltage if T1 is opened while current is flowing through L1 and T2 is not opened because of the current limiting function.