SLUSDB2A August 2018 – December 2021 UCC28951
If the converter is commanding a duty cycle lower than TMIN, then the controller will go into Burst Mode. The controller will always deliver an even number of Power cycles to the Power transformer. The controller always stops its bursts with an OUTB and an OUTC power delivery cycle. If the controller is still demanding a duty cycle less than TMIN, then the controller goes into shut down mode. Then it waits until the converter is demanding a duty cycle equal or higher than TMIN before the controller puts out TMIN or a PWM duty cycle as dictated by COMP voltage pin.