does anyone have some hints on what is going wrong in the following circuit? I want to build up a boost converter that boosts my 4VDC to approximately 16VDC. To do so I use the TPS61040 from TI (http://www.ti.com/product/TPS61040).
As can be seen in the first two pictures, the circuit is working just fine as desired.
But if I now add an additional voltage source betwenn GND and the node OUT-, the circuit does not work anymore (see pictures 3 and 4). But I do not understand why... as all my signals of the boost circuit are referenced to the node OUT-, the boost circuit should not see a difference between the two scenarios? Or what am I getting wrong here?
I also simulated the same circuit using a similar LinearTechnology device (LT1615) on a different simulation software (you can guess which one) and there it works perfectly fine if I add additional sources of whatever value...
Thank you very much for your help!
With best regards