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TINA/Spice/TPS62122: Inverting Buck Boost Simulation

Mihir Gupta65
Intellectual 2155 points
Part Number: TPS62122
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hi Team,

I have a customer who is trying to use the TPS62122 as an inverting buck boost to go from +3.3V to -3.3V (50mA). I took a look at this application note (SLVA478B) as well as PMP9752 and tried to simulate both the circuits in TINA. I've attached my simulation.

tps62122 inverting.TSC

However, my output voltage constantly stays 0V and I see a ripple on the output.

Could you comment on this? What am I doing wrong?

Thanks and Regards,

Mihir Gupta

FAE - South Germany