TPS92691 Small signal mode parameters

I ran this by the systems engineer and he said those equations are correct for a current mode converter. If you would like more information on small signal modeling of current mode converters both Middlebrook and Ridley have very comprehensive documents you can easily find on the web.

Hi Clinton,

Thanks for your confirmation.

Could you specify one or more documents regarding this case for reference, please?


Best regards,
Bell

middlebrook2.pdfThis is the only document I have from Middlebrook. But I'm guessing if you search the web you could find something newer and easier to understand.

Hi Clinton,

Thanks for your sharing.

For the Small signal mode parameters equations I attached before, Could you help check whether there is missing a Rload or not?

Thank you.

Bell

From the systems engineer:

"There is no Rload as it is substituted by Vo/ILED.  That is equivalent to Rload (at DC normalization point).  The small signal does not have Rload because we are driving a non-linear LED load and the small signal is dominated by small signal dynamic resistance rd of the LED devices."