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Original question:

Inverting regulator

LM27341: Simulating inverting configuration

Matt Bruensteiner
Prodigy 10 points
Part Number: LM27341

I am attempting to simulate the inverting configuration of the LM27341 buck regulator.

My goal is +3.3 V input, -9 V, 100 mA output.

However I am having trouble getting this configuration to simulate in PSpice for TI.

Even if I take the provided reference design and simply rename the ground node to "O2" and connect the ground symbol to what was the output pin, I see no output voltage developed in a transient simulation.

(Notice the scale of the inductor current is picoamps and the scale of the output voltage is 10x10^-24 V)

I believe this indicates there is an internal connection to the global ground node in the simulation model subcircuit that is producing unrealistic behavior.

Is there a way to simulate this IC in inverting configuration?

Thanks,

Matt