Other Parts Discussed in Thread: TL431,
Dear TI Technical Team,
I am writing to seek clarification on two aspects of a design using the TL431 for feedback and the UCC28742 controller.
TL431 Feedback Circuit:
I have simulated the circuit in LTspice and am concerned about the current flowing through the optocoupler diode. My simulation shows a current of approximately 1.3A, which seems excessively high. Could you please help me identify potential issues in my design that might be causing this high current?
UCC28742 Switching Frequency:
The WEBENCH design for this circuit specifies a switching frequency of 100 kHz. However, the UCC28742 datasheet lists a maximum switching frequency limit. Could you clarify if the 100 kHz switching frequency is appropriate for the UCC28742, and if not, what would be a more suitable frequency for my design?