SLUS829G August 2008 – February 2020 UCC2897A
PRODUCTION DATA.
This pin is internally connected to an approximately 2.5-V DC source. A resistor (RDEL) to GND sets the turn-on delay for both gate drive signals of the UCC2987A controller. The delay time is identical for both switching transitions between OUT turning off and AUX turning on, as well as when AUX is turning off and OUT is turning on. The delay time is defined in Equation 1.
For proper selection of the delay time refer to the various references describing the design of active-clamp power-converters.