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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6681ATR датащи(PDF) 35 Page - STMicroelectronics |
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PM6681ATR датащи(HTML) 35 Page - STMicroelectronics |
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35 / 47 page  PM6681A Design guidelines 35/47 Figure 39. Circuitry for output ripple compensation The stability of the system depends firstly on the output capacitor zero frequency. The following condition should be satisfied: Equation 24 where k is a design parameter greater than 3 and Rout is the ESR of the output capacitor. It determinates the minimum integrator capacitor value CINT: Equation 25 where gm = 50 µs is the integrator trans conductance. In order to ensure stability it must be also verified that: Equation 26 In order to reduce ground noise due to load transient on the other section, it is recommended to add a resistor RINT and a capacitor Cfilt that, together with CINT, realize a low pass filter (see Figure 39). The cutoff frequency fCUT must be much greater (10 or more times) than the switching frequency of the section: out out Zout sw R C 2 k f k f × × π = × > OUT Zout sw m INT V Vr f k f 2 g C × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − × π > OUT Zout m INT V Vr f 2 g C × × π > |
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