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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) 35 Page - STMicroelectronics |
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L7987L датащи(HTML) 35 Page - STMicroelectronics |
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35 / 41 page  DocID026362 Rev 3 35/41 L7987L Application ideas 41 The current flowing through the internal power MOSFET is transferred to the load only during the OFF time, so according to the maximum allowed L7987L DC switch current (2.0 A), the maximum output current for the buck-boost topology can be calculated from Equation 35. Equation 35 where ISW is the average current in the embedded power MOSFET during the ON time. In addition to these constraints, the thermal considerations summarized in Section 5.5 on page 29 must also be evaluated. Figure 24. Buck-boost PCB layout (top and bottom) The transfer function of the power section for buck-boost topology is summarized below: Equation 36 With below singularities and parameters: Equation 37 A2 < D 1 I = I O U T S W - 2 2 0 1 1 1 ) ( LC LC RHPZ Z LC s Q s s s G s G O LC O RHPZ ES O Z C L D L D D R R C 1 1 1 2 |
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