I am using PoE PD module developed by our partner company.
Its PD interface chipset is TPS2372-3 and I am checking the schematic of the module for some reason.
The datasheet says a 49.9Kohm 1% resistor should be connected from REF to VSS but actually 5Kohm 5% resister
is connected. What would this bring unwanted side effect?
The symptom we are suffering is the capacitors in yellow colored area happen to fail short in 10% defect ratio
when connecting PSE to DUT during IQC.
BTW, there was no overvoltage in the VIN supplied by PSE when monitored by oscilloscope. The measured maximum
input voltage is around 57.2~57.4V. (FYI, the GDT is intalled in transformer side for surge protection)
I am trying to figure out the root cause but no clue yet.
Your advisement would be appreciated.