Finding F(sw) of L5991 SMPS?

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Hi, Page 9 of the L5991 (SMPS controller) datasheet gives the switching frequency as in (1) on page 9

We have RA//RB = 68.1K and CT = 220p.
According to equation (1) on page 9 of the datasheet, this means a frequency of 11.1 milliHertz which cant be right.
Do you know the proper equation for fsw?
 

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You may want to ask for a corrected datasheet, original equation (1) is missing the closing paranthesis. KlausST apparently supplemented it by applying common knowledge.
 
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