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Tool/software:
Hello expert,
Please let me confirm how to set Switching Frequency for TPS61178.
※The data sheet contains the following description:
How are "k" and "CFREQ" derived in the above figure?
(CFREQ is for pattern capacity?)
I could not find a description of those parameters in the datasheet.
Regards,
Ryoma Miyazawa
Hi Ryoma,
The parameters are inside the device.
Please see device Functional Block Diagram below.
The device uses external Rfreq to change the charging current of the capacitor,
when the voltage reaches a typical value, it triggers the comparator and generates the Clock.
Cfreq is the inner charging capacitance, and Tdelay is the delay time of the Comparator.
Best Regards,
Fergus
Hi Fergus,
Thank you for your prompt reply.
I missed the block diagram.
I understand about parameter "CFREQ".
On the other hand, is the parameter “k” always k=3?
I apologize that my comprehension is lacking.
Regards,
Ryoma
Hi Ryoma,
Yes, the K is always 3 for the frequency calculation formular.
Best Regards,
Fergus
Hi Fergus,
I understand about parameter "k".
Thank you so much for your help.
Regards,
Ryoma