Part Number: UCC28782 Hello,
I am currently creating a board using UCC28782 and checking its operation. However, there is a problem that prevents it from starting up properly. Attach the waveform. It switches for the first few cycles, but then stops switching…
Part Number: UCC28782 Hello,
The active clamp circuit of UCC28782 is disabled during LPM, SPB1, and SPB2 operation. Therefore, I am considering adding an RCD snubber circuit as a countermeasure against ringing during LPM, SPB1, and SPB2 operation. I plan…
Part Number: UCC28782 Hello,
I previously asked about LPM behavior in the thread below. Later, during the investigation, it was discovered that the oscilloscope probe was causing the problem. When measuring between SW and GND with a passive voltage probe…
Part Number: UCC28782 Hello,
I would like to ask you about the LPM behavior of UCC28782. During actual machine verification, switching operation may stop when transitioning from LPM to ABM. Therefore, we are measuring the waveform, but in LPM, the on time…
Part Number: UCC28782 Other Parts Discussed in Thread: ATL431
Hello,
I am checking the operation of UCC28782. There are situations where the switching waveform is not stable. Attach the waveform. When it becomes AAM, it is not stable as shown in the attached…
Part Number: UCC28782 Hello,
Please tell me about the Vx_SR setting on line 89 of "Begin Input here" in the Excel calculation tool. The FET I have selected is TK56E12N1. The figure below is a diagram of VDS and capacitance. What is the optimal…
Part Number: UCC28782 Other Parts Discussed in Thread: LMG2610 Hello,
I would like to ask questions regarding UCC28782. (Question 1) Regarding equation 10 of datasheet 8.3.12. You mentioned that CSW is the total capacitance of the switch nodes, but is it…
Part Number: UCC28782 Other Parts Discussed in Thread: LMG2610 Hello,
I checked the calculation of Csw when using LMG2610 using an Excel calculation tool. In the figure below of "Begin Input Here", the settings are made for LMG2610, but are my settings…
Part Number: UCC28782 Hello,
I would like to ask questions regarding UCC28782. I am checking the behavior of ZVS. The measured waveform is shown below. (question 1) Is the low-side current waveform operating normally? (Question 2) Low-side Vds waveform is not…
Part Number: UCC28782 Other Parts Discussed in Thread: UCC28780 Hi,
I'm hoping to get a better sense of if this flyback would be suitable for a DIN power application going from 120VAC to 24VDC. If there are alternate recommendations, please let me know…