eem2am
Banned
Hello,
i wish to use UC3901 isolated feedback generator for SMPS .
It feeds the control signal back to primary side by driving an RF transformer.
here is uc3901 datasheet:-
https://focus.ti.com/lit/ds/symlink/uc3901.pdf
My question is, please can you say if the dimensioning of the timing capacitor (off pin 1) (which sets the pulse transformer driver switching frequency) depends on the input voltage ?
-the uc3901 can have an input voltage from 5 to 40V, and the timing capacitor is always connected from pin 1 to the power rail (as in picture on top of page 4 of datasheet)
-but do you think the frequency depends on the power rail voltage as well?
i wish to use UC3901 isolated feedback generator for SMPS .
It feeds the control signal back to primary side by driving an RF transformer.
here is uc3901 datasheet:-
https://focus.ti.com/lit/ds/symlink/uc3901.pdf
My question is, please can you say if the dimensioning of the timing capacitor (off pin 1) (which sets the pulse transformer driver switching frequency) depends on the input voltage ?
-the uc3901 can have an input voltage from 5 to 40V, and the timing capacitor is always connected from pin 1 to the power rail (as in picture on top of page 4 of datasheet)
-but do you think the frequency depends on the power rail voltage as well?