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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6680 датащи(PDF) 38 Page - STMicroelectronics |
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PM6680 датащи(HTML) 38 Page - STMicroelectronics |
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38 / 49 page  Device description PM6680 38/49 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 36). The cutoff frequency fCUT must be much greater (10 or more times) than the switching frequency of the section: Equation 26 Due to the capacitive divider (CINT, Cfilt), the ripple voltage at the COMP pin is given by: Equation 27 Where VRIPPLEout is the output ripple and q is the attenuation factor of the output ripple. If the ripple is very small (lower than approximately 30mV), a further compensation network, named virtual ESR network, is needed. This additional part generates a triangular ripple that is added to the ESR output voltage ripple at the input of the integrator network. The complete control schematic is represented in Figure 37. Figure 37. Virtual ESR network filt INT filt INT CUT INT C C C C f 2 1 R + × × × π = q V C C C V V RIPPLEout filt INT INT RIPPLEout RIPPLEINT × = + × = COMP COMP OUT OUT C CINT INT R RINT INT C CFILT FILT t Vr C COUT OUT COMP PIN VOLTAGE L L D D OUTPUT VOLTAGE C C R R R1 R1 t t T T NODE VOLTAGE ?V ?V1 R ROUT OUT ?V1 + - Vr Vr gm gm Vr Vr + PWM PWM Comparator Comparator V1 V1 FB FB R R11 R R22 COMP COMP OUT OUT C CINT INT R RINT INT C CFILT FILT t Vr C COUT OUT COMP PIN VOLTAGE L L D D OUTPUT VOLTAGE C C R R R1 R1 t t T T NODE VOLTAGE ?V ?V1 R ROUT OUT ?V1 + - Vr Vr gm gm Vr Vr + PWM PWM Comparator Comparator V1 V1 FB FB R R11 R R22 R R11 R R22 |
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