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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L5988D датащи(PDF) 37 Page - STMicroelectronics |
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L5988D датащи(HTML) 37 Page - STMicroelectronics |
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37 / 52 page  DocID15324 Rev 4 37/52 L5988D Application information 52 Figure 19. Maximum continuous output current vs. duty cycle 6.6 Thermal considerations The thermal design is important to prevent the thermal shutdown of the device if the junction temperature goes above 150 °C. The three different sources of losses within the device are: a) conduction losses due to the not negligible RDSON of the power switch; these are equal to: Equation 43 Where D is the duty cycle of the application. Note that the duty cycle is theoretically given by the ratio between VOUT an VIN, but actually it is quite higher to compensate the losses of the regulator. So the conduction losses increases compared with the ideal case. b) switching losses due to power MOSFET turn ON and OFF; these can be calculated as: Equation 44 Where TRISE and TFALL represent the switching times of the power element that cause the switching losses when driving an inductive load (see Figure 20). TSW is the equivalent switching time. PON RDSON_HS IOUT 2 DR DSON_LS IOUT 2 1D – + = PSW VIN IOUT TRISE TFALL + 2 ------------------------------------------- Fsw VIN IOUT TSW FSW == |
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