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MPZ2012S221A 数据表(PDF) 28 Page - STMicroelectronics |
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MPZ2012S221A 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 56 page  mC=1+SeSnSe=VPP∙gCS∙fSW Sn=VIN−VOUTL (8) 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: FHs= 1 1+ s ωn∙Qp+s2ωn2 (9) where QP= 1 π∙ mC∙ 1−D −0.5 (10) 8.2 Error amplifier compensation network The following figure shows the typical compensation network required to stabilize the system. Figure 35. Transconductance embedded error amplifier RC and CC introduce a pole and a zero in the open loop gain. The transfer function of the error amplifier and its compensation network is: L6983I Error amplifier compensation network DS14040 - Rev 1 page 28/56 |
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