Tool/software: WEBENCH® Design Tools
Hello Team,
I'm Yuta Kurimoto TIJ FAE.
I got a question from customer about the calculation formula of L(Inductance), Cout(Output capacitance), ID(Diode current) in WEBENCH.
Customer plan to use TPS57160-Q1 for buck converter. but their calculation seemed different from WEBENCH results.
Q1. What is the calculation formula of "L" in WEBENCH? Below is correct?
L1 = (Vin - Vout) x Vout / (ΔI x Fs x Vin)
Vout : output voltage
Vin : input voltage
ΔI : output current ripple
Fs : switching frequency
Q2. What is the calculation formula of "Cout" in WEBENCH? Below is correct?
Vripple = ΔI x (1/(8 x Cout x Fs) +R_ESR)
Vripple : output voltage ripple
ΔI : output current ripple
Fs : switching frequency
R_ESR : ESR of output capacitance
Q3. What is the calculation formula of "ID" in WEBENCH? Below is correct?
ID = Iout x (Vin - Vout) / Vin
Iout : output current
Vout : output voltage
Vin : input voltage
