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This is a typical "boost" supply. Normally this is a +12 to +24 supply. But I changed to -12 to +12V.
This is not right because it is trying to make 24V from -12 to +12V. If Vin is -11V then the out put will be 13V.
Below I changed the feed back circuit. Below it is trying to make +12. If Vin is -11V then the output will be 12V.