Tool/software: WEBENCH® Design Tools
Hello I am trying to simulate a boost converter that is designed such that the bias voltage going to the Vin pin of the PWMIC TPS43061 is above the UVLO threshold but the input voltage is below it. The idea is useful for operating with a single lithium ion battery. A full explanation of the design idea come from the enclosed ap note from TI -
"Split-rail approaches extend boost converter input-voltage ranges" The Ap Note comes from the Analog Applications Journal.
The problem I have is that the transient model of the TPS43061 will not allow me to split the voltage between the Vin pin of the TPS43061 and the input to the boost. The circuit is in the enclosed pdf. Whenever I try to run a transient I get the following error message: Irregular circuit - current of component V1. V1 is a VCVS tied to the Vin pin of the TPS43061. I can't check what is going on at the Vin pin because the model is encrypted. I tried adding an input resistance to reduce the current, however the Vin voltage never goes above 3V. I suspect there is an ideal component inside the TPS43061 transient model that forces the Vin pin of the PWMIC to be the same as the Vin of the boost converter.Split Rail Boost Issue.pdf
Any ideas on how to accomplish the split rail simulation would be greatly appreciated.
Thanks,
Chuck Sampson
