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TLK105L: Pfbout voltage drop to 0V

Part Number: TLK105L

When using the tlk105l, we found that sometimes when powered on, the pfbout pin(pin 15) voltage will fall to about 0V, and the tlk105l does not work normally. At this time, even trigger reset pin it has no effect. What is the reason for this problem?

The following figure 1 is our circuit schematic , and the blue line in Figure 2 is the waveform of PFBOUT  pin.

Best regards!