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LM5176: LM5176 Circuit check

Part Number: LM5176

Dear E2E member,

I use webench and simulate it, the circuit as below.

Could you let me know what function of D39 and D40?

Because the mos had body diode, so i want to know the diode which is MUST or OPTION? Thanks!

  • These diodes are optional. If placed properly (namely right across the MOSFET D-S), they can prevent the use of the body diode. These are Schottky diodes usually have lower VF and no reverse recovery, saving some power dissipation by the body diode, and also the switching ringing usually resulted from the body diode reverse recovery.