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PM6675 数据表(PDF) 21 Page - STMicroelectronics |
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PM6675 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 47 page ![]() Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) PM6675 Device description 21/47 Equation 13 Moreover, the CINT capacitor must meet the following condition: Equation 14 where RTOT is the sum of the ESR of the output capacitor and the equivalent ESR given by the Virtual-ESR Network (RVESR). The k parameter must be greater than unity (k > 3) and determines the minimum integrator capacitor value CINT: Equation 15 The capacitor of the Virtual-ESR Network, C, is chosen as follow Equation 16 and R is calculated to provide the desired triangular ripple voltage: Equation 17 Finally the R1 resistor is calculated according to expression 18: Equation 18 RTOT = ESR + RVESR TOT out Z SW R C 2 k f k f ⋅ ⋅ π = ⋅ > Vout Vr f k f 2 g C Z SW m INT ⋅ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ⋅ π > INT C 5 C ⋅ > C R L R VESR ⋅ = C f 1 R C f 1 R 1 R Z Z ⋅ ⋅ π − ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⋅ ⋅ π ⋅ = |
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