Customer is getting negative value for resistor and they want to know how to change it. Below is the inquiry.
"Hi, I am on the way to design a ACF Flyback converter with the Ti UCC28780 chip. Therefore I use the EXCEL Design calculator tool, but with my input values (Vin= 25-40V/DC) Vout =5V, P=5W, fsw=100kHz and asHigh and Low side switch I use Mosfet IRFR120ZPbF. The problem now is that I get a negative value for the bleeding resistor. Wha do I have to change?