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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST1S14 датащи(PDF) 26 Page - STMicroelectronics |
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ST1S14 датащи(HTML) 26 Page - STMicroelectronics |
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26 / 46 page  Application information ST1S14 26/46 DocID17977 Rev 2 7.3 Thermal considerations The dissipated power of the device is tied to three different sources: • Conduction losses due to the not insignificant RDSON, which are equal to: Equation 24 where D is the duty cycle of the application. Note that the duty cycle is theoretically given by the ratio between VOUT and VIN, but in practice it is substantially higher than this value to compensate for the losses in the overall application. For this reason, the conduction losses related to the RDSON increase compared to an ideal case. • Switching losses due to turning on and off. These are derived using the following equation: Equation 25 where TRISE and TFALL represent the switching times of the power element that cause the switching losses when driving an inductive load (see Figure 15). TSW is the equivalent switching time. Figure 15. Switching losses • Quiescent current losses. Equation 26 P ON R DSON I OUT () ⋅ 2 D ⋅ = P SW V IN I OUT T RISE T FALL + () 2 ----------------------------------------- F SW V IN = I OUT T SW_EQ F SW ⋅⋅ ⋅ ⋅ ⋅ ⋅ = P Q V IN I Q ⋅ = |
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