Other Parts Discussed in Thread: UCC28180, UCC28951, UCC28950,
Hi,
I have designed PFC stage according to TIDA-00779 using UCC27531D.
I am testing the circuit without AC Input. I have connected a DC source to Vsense to simulate HVDC Bus. While Vsense between 1.2V and 5.2V I can get the output signal from gate of PFC Controller (UCC28180) also I can see the sam signal at input of UCC27531D. But at the output of the UCC27531D I can see just only VDD signal. When I change Vsense to <1.2V and 5.2> output will be switched back to GND. When I isolate output signal from rest of the circuit result was not changed.
Question is why I could not see the same input signal at the output of the UCC27531D?
Please find schematics and waveforms below.
Beside that I have looking for a step by step debug process for UCC218180 like UCC28951, but I could not find. Do you have any resource to make circuit running step by step?
Input of UCC27531D:
Output of UCC27531D: