Other Parts Discussed in Thread: TPS23753, PMP8803,
Tool/software:
I try to implement device with PoE using TPS23753. As reference I took PMP8803 design.
It start, I able to see 12V on output but it is not stable. It looks like TPS constantly restart.
It not related to MPS, output loaded with 150 Om resistor. It should load with ~1W. I see stable 47V from switch.
VC only 7-8V
Yellow - upper side of current sense resistor
Blue - CTL
Output:
I don't see expected PWM on GATE as on reference board (I have TPS23753AEVM-004 board), only spikes.
I expect 4uS between spikes, but it is not always true:
Schematic:
I didn't find any issues with components nominals.
What I should check to find issue?
