Reverse current in dc dc converter

[balamanikandan]

Hi,

Let us consider a circuit with step down dc- dc buck converter (with synchronous MOSFETs)

Let us assume reverse current passes through the synchronous MOSFET.

1. In what situations, reverse current can damage the circuit.

2. How can we inhibit this?

3. Will dummy load concept help here since dc dc converter has MOSFETs?

Please guide me.

 

[Prototyp_V1.0]

Hi.

1. Consider this question: Do you need a fast diode?
2. answer to your first question will lead to this answer.

3. Where do you plan to connect this dummy load then? Is power loss a problem?

 

[mtwieg]

Why would you want to inhibit reverse current in the FETs? The ability to conduct current in both directions is one of the good qualities of a synchronous converter. Reverse current isn't any more likely to harm the FETs than forward current. Though it can cause issues with current mode controllers (if they're not meant to sense negative current).