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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6983 датащи(PDF) 26 Page - STMicroelectronics |
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L6983 датащи(HTML) 26 Page - STMicroelectronics |
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26 / 63 page  7 Closing the loop The following picture shows the typical compensation network required to stabilize the system. Figure 23. Block diagram of the loop FB VREF R1 R2 RLOAD L COUT HS switch LS switch RC CC LC filter Resistor divider Error amplifier Compensation network PWM comparator PWM control Current sense IHS/gCS VIN 7.1 GCO(s) control to output transfer function The accurate control to output transfer function for a buck peak current mode converter can be written as follows: GCOs =RLOAD∙gCS∙ 1 1+RLOAD∙TSW L ∙ mC∙ 1−D −0.5 ∙ 1+ sωZ1+sωP∙FHs (10) Where RLOAD represents the load resistance, the gCS equivalent sensing trans-conductance of the current sense circuitry, ωP the single pole introduced by the power stage and the ωZ zero given by the ESR of the output capacitor. FH(s) accounts the sampling effect performed by the PWM comparator on the output of the error amplifier that introduces a double pole at one half of the switching frequency. ωZ= 1ESR∙COUT (11) ωP= 1 RLOAD∙COUT+mC∙ 1−D −0.5 L∙COUT∙fSW (12) where: mC=1+SeSn Se=ISLOPE∙fSW Sn=VIN−VOUT L (13) Where ISLOPE is equal to 1 A. Sn represents the on-time slope of the sensed inductor current, Se the on-time slope of the external ramp that implements the slope compensation to avoid sub-harmonic oscillations at duty cycle over 50%. The sampling effect contribution FH (s) is: L6983 Closing the loop DS13116 - Rev 1 page 26/63 |
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