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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L7986TR датащи(PDF) 35 Page - STMicroelectronics |
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L7986TR датащи(HTML) 35 Page - STMicroelectronics |
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35 / 43 page  DocID022450 Rev 6 35/43 L7986 Application ideas 43 Equation 39 where ISW is the average current in the embedded power MOSFET in the on-time. To chose the right value of the inductor and to manage transient output current, that for a short time can exceed the maximum output current calculated by Equation 39, also the peak current in the power MOSFET must be calculated. The peak current, shown in Equation 40, must be lower than the minimum current limit (3.7 A). Equation 40 where r is defined as the ratio between the inductor current ripple and the inductor DC current: So, in the buck-boost topology the maximum output current depends on the application conditions (firstly input and output voltage, secondly switching frequency and inductor value). In Figure 35 the maximum output current for the above configuration is depicted varying the input voltage from 4.5 V to 38 V. The dashed line considers a more accurate estimation of the duty cycles given by Equation 41, where power losses across diodes, external power MOSFET, and internal power MOSFET are taken into account. Figure 35. Maximum output current according to max DC switch current (3.0 A): VO = 12 V ISW IOUT 1D – ------------- 3 A = ISW,PK IOUT 1D – ------------- 1 r 2 --- + 3.7A = |
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