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PM6675AS 数据表(PDF) 21 Page - STMicroelectronics |
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PM6675AS 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 48 page  PM6675AS Device description 21/48 where k is a fixed design parameter (k > 3). It determinates the minimum integrator capacitor value: Equation 7 where gm = 50 µs is the integrator transconductance. If the ripple on the COMP pin is greater than the integrator 150 mV, the auxiliary capacitor CFILT can be added. If q is the desired attenuation factor of the output ripple, CFILT is given by: Equation 8 In order to reduce the noise on the COMP pin, it is possible to add a resistor RINT that, together with CINT and CFILT, realizes a low pass filter. The cutoff frequency fCUT must be greater (10 or more times) than the switching frequency: Equation 9 If the ripple is very small (lower than approximately 20 mV), a different compensation network, called "Virtual-ESR" Network, is needed. This additional circuit generates a triangular ripple that is added to the output voltage ripple at the input of the integrator. The complete control scheme is shown in Figure 26. Vout Vr f k f 2 g C Zout SW m INT ⋅ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ⋅ π > q ) q 1 ( C C INT FILT − ⋅ = FILT INT FILT INT CUT INT C C C C f 2 1 R + ⋅ ⋅ ⋅ π = |
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