Other Parts Discussed in Thread: TPS2373-4EVM-758,
Tool/software:
Hi There,
I have recently designed a PoE module based on the TPS2373-4EVM-758 Evaluation Module(5V/14A), which is working fine. The output voltage and current are as expected, though I have not checked its performance at maximum current.
Due to some application requirements, I need to design a 12V-6A version based on PMP21318 design guidelines, but the output voltage is not stable.
I have measured the voltage across several points on the PCB without a load connected. Schematic is attached for your reference.
• The first image shows the voltage across J2, which is the output voltage.
• The second image shows the voltage across transformer (T1) pins 2 and 5.
• The third image shows the voltage across the feedback loop FB1 and GND.
• The fourth image shows the voltage across PWM1 and PGND and zoomed-in version of the same.
I am clueless about what the problem might be. If you have encountered such problems, your help would be appreciated.
Merry Christmas and happy new year.
Best regards
Shrawan
e2e.ti.com/.../PoE_2D00_12v_2D00_6A.PDF