SLUSBX9I March 2014 – July 2019 TPS23861
The recommended VPWR supply voltage requirement is 44 V to 57 V. A power supply with a nominal 48-V or 54-V output can support both type 1 and type 2 PD requirements. The output current required from the VPWR supply depends on the number and type of ports required in the system. The TPS23861 can be configured for type 1 and type 2 ports and the current limit is set proportionally. ICUT for a type 1 port is 374 mA , ±5%, and for a type 2 port is 645 mA, ± 5%. Size the VPWR supply accordingly for the number and type of ports to be supported. As an example, the VPWR power supply rating should be greater than 3.2 A for eight type 1 ports or greater than 5.5 A for eight type 2 ports, assuming maximum port and standby currents.