Step down converter frequency (AZ34063UP-E1) 180Khz ?

[tsachi]

Hi,

I was looking on AZ34063UP-E1, and it's spec at :
http://www.mouser.com/ds/2/115/AZ34063U-271663.pdf

which stated that it's a 180Khz switching regulator, and then I stumbled on fOSC spec being between 30-45 Khz.
Am I missing something ?
i.e. does this switching regulator works at 180Khz ( with corresponding capacitor ), or does it work in the 30-45Khz range ?

Tsachi

[rob77]

30-45Khz is specified for 1nF timing capacitor (more acurately VPIN5=0V, CT=1.0nF, TA=25oC) . you can use smaller capacitor for higher frequency. but considering the fact it's a standard 34063, i wouldn't go higher than that 30-45Khz.

[tsachi]

Oh... I see. The frequency was calculated based on the capacitor value in the example.

thanks for the clarifications !

Tsachi