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TL494: Timing resistor value

Part Number: TL494

Hi team,

I would like to increase duty cycle keeping switching frequency constant, then I want to increase capacitance and decrease resistance. 

I selected Rt=1.8kohm and Ct=0.015uF then Duty Cycle becomes 45%. 

#1. Is there any way to increase Duty cycle more? 

#2. Rt resistor value is specified to select between 1.8kohm to 500kohm in the EE table. 

How does TL494 behaves if Rt is less than 1.8kohm?

regards,