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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L7987L датащи(PDF) 28 Page - STMicroelectronics |
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L7987L датащи(HTML) 28 Page - STMicroelectronics |
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28 / 41 page  Application information L7987L 28/41 DocID026362 Rev 3 The following suggestions can be followed for a quite common compensation strategy, assuming that CP << CF and RS << RU. Starting from Equation 19 on page 24, in case of type III compensation network and MLCC ceramic output capacitors the control loop gain module at s = 2 • FBW allows to fix the RF/RU ratio: Equation 26 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 26. 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 27 Select CS in order to place FZ2 at FLC Select RS in order to place FP2 at 0.5 • FSW Equation 28 1 1 ) 2 ( , U F BW LC FF BW III LOOP R R f f k f s G CF 1 2 R F 0.1 fLC ------------------------------------------------; = CP 1 2 R F 0.5 fSW ------------------------------------------------- = CS 1 2 R U fLC ----------------------------------; = RS 1 2 C S 0.5 fSW -------------------------------------------------- = |
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