LTC4291 Port Power deliver

Hello,

RSIG too Low means exactly that the signature resistance is too low. IEEE requires PDs to present 25kOhms (with limited capacitance) to be considered a valid PD. The PSE is reporting that this PD is drawing too much current during detection, so it looks like its impedance is less than 17kOhms but more than short circuit. 

Is this IP camera IEEE 802.3-compliant? You can refer to the LTC4291-1 software documentation for strategies for when non-standard or legacy PDs are connected.

Best Regards,

Eric

Hello,

I Check this IP Camera With POE Switch it Work Well. I Check IP Camera Technical Details it is Working with PoE (802.3af) so it is ok for  LTC4291IUF-1#PBF & LTC4292IUj#PBF Testing.

Thank You

What is the make and model of the IP camera?

Please order from ADI the DC2685B-KIT, LTC4291-1/LTC4292 demo board so we have a known PSE.  Connect the IP camera to this and report the results.

Hello,

We Use https://cctv.dlink.co.in/product.php?ref=DCS-F4612 Camera.

Hello,

We Use https://cctv.dlink.co.in/product.php?ref=DCS-F4612 IP Camera.

Hello,

We Order DC2685B-KIT,LTC4291-1/LTC4292 demo board it work well with this IP Camera.

When IP Camera Disconnect.

When IP Camera Connect

Great.  The next steps are to look at the hardware implementation and environment of the LTC4292/LTC4291-1 in your system.  Please make sure your application matches the demo board.  Also check to see if there could be any ground leakage paths with any test equipment that could be connected during your tests.

Hello,

I check Schematic with DC2685B-KIT it is almost same for your reference I attached Schematic.

Is there any software requirement for auto mode ?

Hello,

When We connect more then 2K Series resistor at out pin then detection status is Detect Good but it assign wrong class.

The OUT pin is not to have series resistance on this part; as you saw it can affect classification.  There is resistance in your system in parallel with the PD that is causing the signature resistance to appear low.  Please test the PD with the LTC4292/LTC4291-1 demo board and verify this PD is valid.

The OUT pin is not to have series resistance on this part; as you saw it can affect classification.  There is resistance in your system in parallel with the PD that is causing the signature resistance to appear low.  Please test the PD with the LTC4292/LTC4291-1 demo board and verify this PD is valid.