Hi
Our customer is considering about the IKFF at low frequency.
IKFF= (Vin_min-VKFF)/RKFF=1/(58.14*Rt+1340)
The IKFF is 16.8uA when the Fsw=55kHz(RT=1Mohm).
The IKFF is out of spec on the datasheet at that condition. Is that OK?
Is it there any limitation for IKFF at low frequency?
We have a abnormal operation when the IKFF is low current (<20uA) at low freqeuncy.
Please let me know if you have any question.
Regards,
Koji Hamamoto