Part Number: UCC39002 @John Griffin1 ,
The problem posted at the link ( https://e2e.ti.com/support/power-management/f/196/t/767243 is not answered yet. The previous link has now locked and I can't access it.
Is there anyway that we can do communication…
Part Number: PMP5236 Hi Team,
My customer would follow the PMP5236 design, but has two questions below, 1. Can this design operate normally to support 12V/2A output power if one of the source is failed or unplugged? 2. The PD in this design is TPS23754…
Part Number: UCC39002 My customer is working a dual POE power supply based on UCC39002 and PMP5236 .
So far , the problem is that the power supply oscillates between 2 power rails at light load and stops oscillating when the load goes up to 120mA.
Once…
Hi Kevin,
The TPS2372 is a .bt device which is backwards compatible with .at. For an .at two port reference design, you can switch out the class resistor of the TPS2372 to Class 4 and then use this solution for .at power levels.
Also, could you please…
Hello Kevin!
I hope you are well. The PMP5236 design requires the UCC29002 for current sharing. These parts monitor the current and control the feedback of the TPS23754. Without them, one of the TPS23754 devices would take over and it would not be 'balanced…
Hi Kevin,
Is customer looking for 50/50 current sharing ? If AT+BT then the max power with 50/50 current sharing is 51W before the AT switch exceeds its max power rating.
If so, I recommend looking at PMP5236 as a reference which uses current sharing controllers…
Hello,
This design more closely follows PMP5236
The EVM is a 5V sync flyback, and this design is a 12V diode flyback. That is why there are a lot of differences. This is definitely a DCDC problem if you have any experience with DCDC flyback design. …
Hi Terry,
In order to implement sharing, the system must actively be able to adjust the DCDC to match outputs such that the two channels share power equally. This can be done with two separate DCDC converters. Just to give an example, when we use two…
Hi Mark, On the non-working boards, could you check to see how much capacitance & if there is some leakage on the Vc pin? The 22uF you have on the schematic is true to the original PMP5236, but there may an assembly error. Also, I've reviewed your…
Hi Matthieu,
Since 4W max is still within the standard for PoE, why not use one PoE PD?
If current sharing is needed, you will need to implement two PDs and two converters that are sharing with current sharing controller on the feedback. Similar to…