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LMR33630: LMR33630 work as invert DC/DC

Part Number: LMR33630

Hi team,

Our customer need an invert DC/DC(12V to -12V@1A), when I simulated in WEBENCH, and got an design as below:

the question is: why need to add an  small diode(D1) at the output?

The diode is DB2S31600L, and it`s an only 100mA diode, do we must need to add this diode?

Thanks very much.

Regards, Sunny