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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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R5972D датащи(PDF) 22 Page - STMicroelectronics |
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R5972D датащи(HTML) 22 Page - STMicroelectronics |
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22 / 35 page  Application information R5972D 22/35 DocID026873 Rev 1 compensate for the losses in the overall application. For this reason, the switching 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 23 Where TRISE and TFALL represent the switching times of the power element that cause the switching losses when driving an inductive load (see Figure 12). TSW is the equivalent switching time. Figure 12. Switching losses Quiescent current losses. Equation 24 Where IQ is the quiescent current. Example 2 VIN = 12 V VOUT = 3.3 V IOUT = 1.5 A RDS(on) has a typical value of 0.25 at 25 °C and increases up to a maximum value of 0.5. at 150 °C. We can consider a value of 0.4 . TSW is approximately 70 ns. IQ has a typical value of 2.5 mA at VIN = 12 V. PSW VIN IOUT TON TOFF + 2 ------------------------------------ FSW VIN = IOUT TSW FSW = PQ VIN IQ = |
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