LNK626 ON TIME EXTENSION MODE and switching frequency
1\As the note in datasheet, "When the duty cycle exceeds DCMAX the LinkSwitch-CV operates in on-time extension mode." , what would the switching frequency be in on time extension mode?
2\we found the switching frequency is around 80khz, far below 100khz when duty cycle didn't exceed DCMAX, do you know why?
INPUT VOLTAGE AROUND 100VDC, LP 900UH;
THANKS A LOT;