Hello Team, our customer is using LM 3478 IC in flyback circuit.
The calculated resistance for setting frequency does not match with what he measured on the board.
The formula is as following;
For example, considering in above formula fs in Hz and Rfa in Ω if I want to set a frequency of 120 kHz the resulted resistance is 179.3 kΩ.
After soldering on the board 180 kΩ resistor the switching frequency measured is ~104 kHz.
Could you help me to clarify this situation?
Many Thanks
Josef
