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L7987L 数据表(PDF) 26 Page - STMicroelectronics |
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L7987L 数据表(HTML) 26 Page - STMicroelectronics |
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26 / 41 page ![]() Application information L7987L 26/41 DocID026362 Rev 3 After choosing the regulator bandwidth (typically FBW < 0.2 • FSW ) and a value for RU, usually between 1 k and 50 k, in order to achieve CF and CP not comparable with parasitic capacitance of the board, the RF required value is computed by Equation 22. Select CF in order to place FZ1 below FLC (typically 0.1 • FLC) Select CP in order to place FP1 at 0.5 • FSW Equation 23 The resultant control loop and other transfer functions gain are shown in Figure 12. Figure 12. Type II compensation - bode plot CF 1 2 R F 0.1 fLC ------------------------------------------------ CP ; 1 2 R F 0.5 fSW ------------------------------------------------- == |
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