Just to confirm, are you using the TI EVM PCB modified for 5V out or your own PCB? By changing R22 to 2k, you lower the loop gain. It is possible that the circuit was unstable (maybe due to some other factor) and by reducing the gain, you were able to…
Hi Lan,
1) Yes, you can probably modify this EVM for your testing.
2) The TPS23753A EVM and PMP6584 are different topologies. Since SLVA305C is a design for Flyback with diode rectifier, you can modify the EVM (flyback with diode rectifier) to see…
TI can furnish the UNH Clause 33 test report for almost any PD controller that TI makes. This test report summarizes the requirements of the IEEE 802.3.
TI also has many PD+DC/DC controllers for POE (TPS23750, TPS23753A, etc.). A good starting point…
I do not have EMI test data for the PMP9175 design. The TPS23753AEVM-004 is a similar design.
www.ti.com/.../toolssoftware
The user guide contains a preliminary measurement of the conducted EMI. Note that it was measured with the output ground floating…
Other Parts Discussed in Thread: LM5071 , TPS23754 , TPS23753A , TPS23753 Can you provide guidance by way of an app note, reference design, design tool or other on selecting a suitable flyback transformer to be used with the LM5071 in a POE PD design…
Please examine the layout difference between the previous working design and this PCB design especially with respect to routing of the CTL pin trace (pin 1 of TPS23753A). If the CTL trace is routed too closely to noisy switching signals then the loop…
Other Parts Discussed in Thread: ISO7421 What would be the tradeoff to use the ISO7421 in the PMP8896 instead of optocouplers?
Related forum post: Could TPS23753A be used with ISO7421 instead of optocouplers?
Hi Naser,
Here is a 5V/1.4A reference design using TPS23753A. I have attached the schematic & BOM for your comparison.
- Tom
PMP5314_RevB_SCH.pdf
PMP5314_RevB_BOM.xls
Part Number: TPS23753AEVM-004
Hi,
Here’re some questions from customer about TPS23753A-004EVM.
1. For the original EVM which is synchronous MOS at secondary side, why it will be CCM even load=0A? What’s the gate turn on/off criteria? When…
