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UCC28C54: Operational frequency

Part Number: UCC28C54

Tool/software:

Hi Team, 

in DS at table 7-1 it seems that the UCC28C54DR can work with a low frequencies as low as 10kHz. 

in our design we are using 2.2nF and around 70kOhm resistor but when playing around with the resistor values we are experiencing issues working below 20kHz. 

is there a problem working at such low frequencies?