SLVSD02D March 2015 – June 2019 TPS65982
The TPS65982 has an integrated active pulldown on VBUS when transitioning from PP_HV to PP_5V0, shown in Figure 36. When the PP_HV switch is disabled and VBUS > PP_5V0 + VHVDISPD, amplifier turns on a current source and pulls down on VBUS. The amplifier implements active slew rate control by adjusting the pulldown current to prevent the slew rate from exceeding specification. When VBUS falls to within VHVDISPD of PP_5V0, the pulldown is turned off. The load on VBUS will then continue to pull VBUS down until the ideal diode switch structure turns on connecting it to PP_5V0. When switching from PP_HV or PP_EXT to PP_5V0, PP_HV or PP_EXT must be above VSO_HV to follow the switch-over shown in Figure 35.