Other Parts Discussed in Thread: TIDA-00443,
HI,
we are currently working on the TIDA 00443 PFC. while testing we observed some undesirable Vsense and Isense Waveforms. herewith i attached the respective waveforms for your reference.
test condition:
Fixed Output Boost PFC configuration
input AC 187V
output DC 200V
output current 0.92A
waveforms without mosfet
vsense and input current
Isense
dc input
schematic diagram (Isense &Vsense)
1. Why the Vsense waveform is not identical to the output DC voltage waveform? what is the reason for that spike?
2. What is the reason for the Positive Isense waveform?
also we observed that, after few minutes Isense and Vsense pins goes to some negative values like -320mV or -200mV (without input power). herewith i attached that waveforms also.
Vsense (without input)
Vsense (input ON)
Isense( without input)
Isense (input ON)
now the Isense Looks like a positive and negative half cycles. in the previous waveforms it looks fully positive. what is the reason for this? is there any ground issue? then how to resolve the issue?
help us to solve this issues.
thanks
Kalyan