I use the circuit of LT3752, that is on the ...LTspiceXVII\examples\jigs .
The circuit is not stable. It gets out of stabilization even when the output voltage is being build on the startup.
I tried to change capacitor+resistor that is connected to the COMP pin of LT8311, and the resistor that is connected to LT3752. But it stays unstabilized.
1- Is there a way to make AC simulation (with LT3752 + LT8311) to check the Open loop parameters and close loop parameters?
2- What is the right way to deside what is the right compensation network?
My design is:
- Vin: 18-48
- Vout: 15
- Iout: 1.3A
- Lout= 68uF
- Cout= 4.7uF
- Np=50uH Ns=200uH