LMZ14203H Inverting Design

Hi,

I'm using a LMZ14203H Simple Switcher to generate a 15V output voltage for an ADC. But this ADC needs a voltage of -15V too, and I want to use this same Simple Switcher to generate this voltage, because I have some of them in stock.

I used the SNVA556 and AN-2027 as reference and tried to simulate the circuit on PSpice, using the exactly circuit presented on the references. But the output stayed on 0V with a little oscillation between - 2mV and +2mV. I think this may be a limitation in PSpice model.

Has anyone simulated or tested this design? It really works?

Thanks.