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LMR33640: Inverting Buck-Boost +12v to -5v

Part Number: LMR33640

Tool/software:

Hi all,

I am trying to recreate the inverting buck-boost converter with the lmr33640 as shown in application note "Working With Inverting Buck-Boost Converters", snva856b. But i am having a hardtime getting no negative voltage output of the converter. This is my first time using PSpice, so it may be something wrong with my setup but i do not think so. Simulation is setup very standard with Time Domain, 1000ns run to time.

I usually just use Webench, but it seems to not support inverting converter for LMR33640.

Any one that could point me in the right direction? (Whenever i get this going, what i am actually are looking for is +12v to -15.5v @ 1.5A)