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LMZ34002 switching frequency

Other Parts Discussed in Thread: LMZ34002

Hi,

Reading the LMZ34002 datasheet I came to the  point where there are two switching frequencies to choose. At this point, the datasheet gives me the following information:

In my situation, I have a higher input voltage (>18) but I don't have a lower output voltage (I'm designing for -12V). In this case, the most recommended switching frequency is still 800kHz (where the RT pin is shorted to the A_VOUT)?

Regards,

João P. B. Figueiredo