INNO3678C I sense pin resistor value selection
Hi, I'm designing a SMPS Circuit with INNO3678C and I have a few questions about resistor selection around I sense pin.
I refered 'DER-726 - 65 W Isolated Flyback Adapter Using InnoSwitch3-EP PowiGaN and MinE-CAP' to design my circuit.
1) As attched 1_3, it uses 0 ohm resistor for R13 but I don't know what's difference with short circuit.
2) And there's GND between R13 and R16, so it seems that there would be no signal to I sense pin.
How does it work? It would be great if you give me some technical explanation and criteria.
3) Plus, what happens if I change R13 0ohm to 10ohm?
Actually, I use R13 as 10ohm and R16 as 0.003ohm to regulate secondary load current under 9A.
I read some criteria to choose R13 value but i have no idea about choosing R16 value.
It would be truly great if you give me some technical explanation and criteria.
4) Last, I want to know where GND should be.
In 1_3, GND locates between R13 and R16 so there's potential difference between GND and GNDpin.
But in 2_2, GND locates between R16 and C9 so GND shorted with GNDpin.
What's difference? For your information, I got 2_2 circuit from INNOSWITCH3-ep Family datasheet.
If you give me some technical explanation and criteria, it would be super great.
I'm sorry for many questions. Have nice day.