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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST1CC40 датащи(PDF) 25 Page - STMicroelectronics |
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ST1CC40 датащи(HTML) 25 Page - STMicroelectronics |
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25 / 37 page  DocID18279 Rev 5 25/37 ST1CC40 Application information 37 Switching losses due to turning ON and OFF. These are derived using Equation 29: Equation 29 where TRISE and TFALL represent the switching times of the power element that causes the switching losses when driving an inductive load (see Figure 14). TSW is the equivalent switching time. Figure 14. Switching losses Quiescent current losses. Equation 30 Example (see Section : Example): VIN = 12 V, VFW_LED = 3.5 V, nLED = 2, ILED = 700 mA The typical output voltage is: Equation 31 RDSON_HS has a typical value of 95 m and RDS(on)_LS is 69 m at 25 °C. For the calculation we can estimate RDS(on)_HS = 140 m and RDS(on)_LS = 100 mas a consequence of TJ increase during the operation. TSW_EQ is approximately 12 ns. IQ has a typical value of 1.5 mA at VIN = 12 V. PSW VIN IOUT TRISE TFALL + 2 ----------------------------------------- FSW VIN = IOUT TSW_EQ FSW = AM14826v1 PQ VIN IQ = VOUT nLED VFW_LED VFB + 7,1V == |
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