JAJSNC5 april 2023 LM5171-Q1
ADVANCE INFORMATION
Select current loop cross over frequency fCI to 1/6 of the switching frequency. According to Equation 48, the compensation network for the inner current loop is determined by:
Selecting the closest standard values for the compensation network, namely,
RCOMP1 = RCOMP2 = 3.65kΩ
CCOMP1 = CCOMP2 = 15 nF
CHF1 = CHF2 = 1 nF
Figure 8-10 shows the Bode Plots of the power plant , the current loop compensation gain Gci(s) , and the resulting total open loop gain Ti(s).
For buck mode, select the voltage loop crossover frequency at 1/10 of the current loop crossover frequency. According to Equation 104, the compensation network for the voltage current loop is determined by:
Selecting the closest standard values for the compensation network, namely,
RLCOMP = 6.2kΩ
CCOMP1 = 100 nF
CHF1 = 1.5 nF
Figure 8-10 shows the Bode Plots of the power plant Gvs_BK(s), the voltage loop compensation gain Gcv(s) , and the resulting total open loop gain Tvs_BK(s).