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A5975D Datasheet(PDF) 28 Page - STMicroelectronics |
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A5975D Datasheet(HTML) 28 Page - STMicroelectronics |
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28 / 50 page  Application information A5975D 28/50 Doc ID 018760 Rev 1 ● Switching losses due to turning on and off. These are derived using the following equation: Equation 24 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 = 3 A 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. P SW V IN I OUT T ON T OFF + () 2 ------------------------------------ F SW V IN = I OUT T SW F SW ⋅⋅ ⋅ ⋅ ⋅ ⋅ = P Q V IN I Q ⋅ = |
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