I am using the SI3402 chip to use POE.
But it does not work properly.
The circuit I have constructed is as follows.
POE: SI3402 (non-isolated)
Ethernet Transceiver: H2019NL
When POE cable is plugged in, it charges for the first time but it becomes impossible to charge soon. I think that the POE side circuit is a problem because I operate normally when only 5V is applied to the charge IC.
Since it is confirmed that 5V is output from the output terminal, it is not a voltage problem.
I attach the schematic that I composed with PDF.
Please make sure that there is something strange in my circuit.
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We have an isolated PoE PD test board with an Si3402-B on board, using a Coilcraft FA2732 transformer to create an isolated +12V at the output.
Class detection works fine, but when starting the PSE, the output ramps to approx. 8V and then it aborts; the PSE reports OVL.
Do you see any obvious issue in the enclosed schematics? Can the opto-coupler have a significant influence on the boot-up process?
Thanks for your help.
I am using the SI3402-B chip to use POE（isolate）.
But it does not work when loading exceed 5V/1.3A.
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What is the difference between Si8655BA-B-IU and Si8655BA-C-IU
If it's in the datasheet , I really can't see it.
Extra credit: Why is the small-pitch package called a "QSOP?" I expected pins on four sides.