ZHCSNB6A April 2021 – February 2022 TPS23882B
PRODUCTION DATA
Although the supported VPWR supply voltage range is 44 V to 57 V, as with the 802.3at standard for Type-2 PoE, a 50-V minimum supply is required to comply with 2-Pair Type-3 (up to 30W) IEEE requirements. The TPS23882B requires approximately 10-mA typical and 12-mA maximum from the VPWR supply, but the total output current required from the VPWR supply depends on the number and type of ports required in the system. The TPS23882B can be configured to support either 15.5 W, or 30 W per port and the power limit is set proportionally at turn-on. The port power limit, PCUT, is also programmable to provide even greater system design flexibility. However, size the VPWR supply accordingly to the PoE Type to be supported. As an example, TI recommends a 130-W or greater power supply for eight type 1 (15.5 W each) ports, or TI recommends a 250-W or greater power supply for eight 2-pair type 3 (30 W) ports, assuming maximum port and standby currents.
In IEEE complaint applications, only 4-pair configured ports are capable of supporting power levels greater than 30 W.