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PM8903ATR 数据表(PDF) 19 Page - STMicroelectronics |
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PM8903ATR 数据表(HTML) 19 Page - STMicroelectronics |
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19 / 33 page  PM8903A Application information Doc ID 024147 Rev 1 19/33 stability, it should not exceed FSW/2π. To achieve a good phase margin, the control loop gain must cross the 0 dB axis with -20 dB/decade slope. For example, Figure 12 shows an asymptotic bode plot of a type III compensation. Figure 12. Example of type III compensation The open loop converter singularities are: The compensation network singularity frequencies are: F LC 1 2 π LC OUT ⋅ ---------------------------------- = F ESR 1 2 π C OUT ESR ⋅⋅ -------------------------------------------- = F Z1 1 2 π R F C F ⋅⋅ ------------------------------ = F Z2 1 2 π R FB R S + () C S ⋅⋅ ----------------------------------------------------- = F P1 1 2 π R F C F C P ⋅ C F C P + --------------------- ⎝⎠ ⎛⎞ ⋅⋅ -------------------------------------------------- = F P2 1 2 π R S C S ⋅⋅ ------------------------------- = |
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