Dear TI and to whom it may concern.
I'm trying to simulate the model of the LMR36006 (buck synchronous) you provided on your site in the steady state transient mode on PSpice. With positive voltages, and in normal configuration (as on datasheet) it works fine. I'm trying to use it instead as a boost for negative input to a more negative output voltage, as in the schematic in the attachement. I can't manage to make it work, it seems like the PSPICE model doesn't like "negative ground voltages" for VHDL control and it stops switching, even if the topology seems good. I tried every configuration, with schottky diodes and not. On LTspice the same configuration with similar buck converters works fine, on PSpice TIs one don't. Also normal simulation with just a N-MOS, inductor and diode in the same configuration work fine, the problem is in the converter block.
Can you help me with this? Is it a configuration problem not fitting with the applciation, or am I right about the model doesn't like negative volateges (less than 0V, as it sees only logic 0-1 in the internal logic)?
Or do I have to handle grouds differently? Or the feedback has to be inverted?
Thank you,
I hope you can help me, i'm getting mad about that,
Pier