ZHCSJ10B September 2006 – November 2018 TPS2376-H
PRODUCTION DATA.
The IEEE 802.3af specification requires that the PD maintain a minimum load capacitance of 5 μF.
A PD can fail the dc MPS requirement if the load current to capacitance ratio is too small. This is caused by having a long input current dropout after a drop in input voltage. The PD should begin to draw input current within 300 ms of an abrupt 13 V input droop.
A particular design may have a tendency to cause ringing at the RTN pin during startup, inadvertent hot-plugs of the PoE input, or plugging in a wall adapter. It is recommended that a minimum value of 1 μF be used at the output of the TPS2376-H if downstream filtering prevents placing the larger bulk capacitor right on the output. When using ORing option 2, it is recommended that a large capacitor such as a 22 μF be placed across the TPS2376-H output.