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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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A5974AD датащи(PDF) 28 Page - STMicroelectronics |
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A5974AD датащи(HTML) 28 Page - STMicroelectronics |
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28 / 49 page  Application information A5974AD 28/49 Doc ID 018762 Rev 1 where TRISE and TFALL represent the switching times of the power element that cause 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 25 where IQ is the quiescent current. Example: –VIN = 12 V –VOUT = 3.3 V –IOUT = 2A RDS(on) has a typical value of 0.25 @ 25 °C and increases up to a maximum value of 0.5. @ 150 °C. We can consider a value of 0.4 Ω. TSW is approximately 70 ns. IQ has a typical value of 5 mA @ VIN = 12 V. The overall losses are: Equation 26 The junction temperature of the device is: Equation 27 P Q V IN I Q ⋅ = P TOT R DSON I OUT () ⋅ 2 DV IN I OUT T SW F SW V IN I Q= ⋅ + ⋅⋅ ⋅ + ⋅ = 0.4 2 2 0.3 12 2 70 10 9 – 500 10 3 12510 3 – ⋅⋅ + ⋅⋅ ⋅ ⋅ ⋅ + ⋅⋅ 1.38W ≅ = T J T A R thJA P TOT ⋅ + = |
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