Hello,
I calculated the fSW by equation 4.
RRT(kohm) = 55300 x fSW ^-1.025(kHz)
But the evaluation result on our PCB has incorrect value.
The applied value and our PCB's value are following.
- RRT is 68kohm --> 690kHz(Equation 4), 780kHz(our PCB)
- RRT is 100kohm --> 474kHz(Equation 4), 548kHz(our PCB)
*Ta = 25degC
*RRT = 1% Accuracy
Do you find what is this cause?
Our customer also doubted whether the equation-4 is correct.
Thank you.
Best Regards,
H. Fujikawa
