TL2843B - the oscillator frequency

Hi all,

Would you mind if we ask TL2843B?

<Question>
If the value of RT is less than  5kΩ(5kohm < Rt), how much of the coefficient will be?
The datasheet shows 1.76.(f ≈ 1.72 / R T C T)

Furthermore, our customer confirmed measured value and calculated value.
And they are compared followings;

1. Ct=1000pF, Rt=4.9kΩ
-measured value: 310kHz
-calculated value: 350kHZ
As the result of the measurment, the coefficient was 1.50.

2. Ct=1000pF, Rt=3.2kΩ
-measured value: 460kHz
-calculated value: 540kHZ
As the result of the measurment, the coefficient was 1.45.

Our customer guessed that the range of the coefficient will be changed from 1.4 to 1.5 ,in case of Rt 3～5kΩ.
So, our recognition is correct?

Kind regards,

Hirotaka Matsumoto