Part Number: TPS23758EVM-080 Hi Genius Folks!
In reference to the TPS23758-EVM, I'm making a board that pretty much follows the design.
I'm curious about how to understand the operation of Q1 (what is the role, and how do all those diodes drive the…
Hello Borge,
Currently our TPS23755 and TPS23758 (type 1 PDs) have this feature. We can discuss more options offline.
As for other suggestions, this following app note has suggestions for reducing EMI in an isolated PoE system:
http://www.ti…
Hello,
Yes this is possible.
However, the first PSE would have to supply enough power for both devices (30W + 15W = 45W). Then the first PD must also be able to pass all 45W- 30W to the DCDC and 15W to the next PSE. So I would recommend our TPS2372…
Part Number: TPS23750EVM-108 Other Parts Discussed in Thread: TPS23750 , TPS23755 , TPS23753A , TPS23758 , PMP8803 , TPS23755EVM-894 , TPS23753 I have TPS23750 Flyback-Converter Evaluation Board(HPA108).
This Board is 3.3V Output. I woud like to change…
Part Number: TPS23755 Hi team,
What role does Q1 play in the non-isolated circuit shown in Figure 8.2 of the datasheet and on the following page?
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/886876…
Hello,
I am assuming "the waveform" is PoE+ and PoE-. This looks like the basic waveform on the cable while the PSE is waiting for a valid detection. So your device is not giving a valid detection.
Another check you can do is to power your board…
Hi Julian,
Note the square wave from the gate2 pin is capacitively coupled to the data transformer then to the gate of the FET. U5 will clamp the negative pulse to close to secondary ground. The diode should at least be rated 2x the bias winding voltage…
Hi Jerry,
For 13W applications an EP10 core will be too small. Thermal performance would not be good.
For the 5V solution we recommend a synch flyback in order to have good regulation. Therefore for 5V solution using primary side regulation, TPS23758…
Part Number: TPS2372 Other Parts Discussed in Thread: TPS2378 , PMP11012 , TPS23757 , TPS23757EVM , TPS23758EVM-080 , TPS23753A , TPS23758 i am planning to use POE PD interface chip to get power about 15W from ethernet, but I found that all POE PD interface…
If wanting to OR at the secondary, you can take the 12V input and buck down to 5V and use TPS2120 to mux the 5V rail. The 5V solution I recommend on the PoE side is the TPS23758 in which you can copy the EVM design.
If wanting to OR at the primary…
