mtwieg
Advanced Member level 6
What we're saying is that while you could ground the SW nodes from the controller and then implement your own level shifters externally, there is a simpler and equally effective way. You connect the controller as normal, but instead of using the TG gate driver to drive each FET directly, you use it as a logic signal to drive a simple gate driver IC (the type suitable for low-side driving, not a bootstrapping one) which is also referenced to the SW node, no extra level shifter required. The gate driver IC will be powered by your isolated supply, which is also referenced to the SW nodes, and it can be higher than 6V. This should get your desired result with minimal tampering with the controller itself.