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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6670 датащи(PDF) 48 Page - STMicroelectronics |
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PM6670 датащи(HTML) 48 Page - STMicroelectronics |
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48 / 53 page  Application information PM6670 48/53 If the ripple on pin COMP is greater than the integrator output dynamic (150mV), an additional capacitor Cfilt could be added in order to reduce its amplitude. If q is the desired attenuation factor of the output ripple, select: Equation 50 In order to reduce noise on pin COMP, it's possible to introduce a resistor RINT that, together with CINT and Cfilt, becomes a low psas filter. The cutoff frequency fCUT must be much greater (10 or more times) than the switching frequency of the section: Equation 51 For most of applications both RINT and Cfilt are unnecessary. If the ripple is very small (e.g. such as with ceramic capacitors), an additional compensation network, called "Virtual ESR" network, is needed. This additional part generates a triangular ripple that substitutes the ESR output voltage ripple. The complete compensation scheme is represented in Figure 43. Figure 43. Virtual ESR network q ) q 1 ( C C INT filt − ⋅ = FILT INT FILT INT CUT INT C C C C f 2 1 R + ⋅ ⋅ π = VREF CFILT CINT RINT PWM Comparator gm + - + - 0.9V VDDQ Ton Generation Block C R R1 L Integrator |
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