Hello,
This might be somewhat of a dumb question, the datasheet provided a design example utilizing high-side current sensing via a current sense XFMR. The current sense resistor was chosen to be 7.5Ohm in the design example, also shown below in the schematic. What do the other current sense components do and how were they calculated?
1. The 102 Ohm resistor and 10pF capacitor appear to form an RC filter, with a cutoff frequency at 156kHz. Why is this needed and why at that particular frequency?
2. What type of diode does TI recommend using at the output of the current sense XFMR?
3. What is the purpose of the 10kOhm resistor? Is it to scale the voltage at the secondary side of the XFMR?
Thanks a lot