SLUS829G August 2008 – February 2020 UCC2897A
This high-current output drives an external N-channel MOSFET. The UCC2897A controller uses an active-high drive signal for the main switch of the converter.
Due to the high-speed and high-drive current capability of these outputs (AUX, OUT) the parasitic inductance of the external-circuit components connected to these pins should be carefully minimized. A potential way of avoiding unnecessary parasitic inductances in the gate-drive circuit is to place the controller in close proximity to the MOSFETs and by ensuring that the outputs (AUX, OUT) and the gates of the MOSFET devices are connected by wide overlapping traces. TI recommends connecting a 10-kΩ resistor from this pin to PGND pin to reduce a possible parasitic effect from layout.