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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LED5000 датащи(PDF) 28 Page - STMicroelectronics |
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LED5000 датащи(HTML) 28 Page - STMicroelectronics |
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28 / 52 page  Application notes - buck conversion LED5000 28/51 Doc ID 023951 Rev 1 higher than this value to compensate for the losses in the overall application. For this reason, the conduction 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 38 Where TRISE and TFALL represent the switching times of the power element that cause the switching losses when driving an inductive load (see Figure 18). TSW is the equivalent switching time. Figure 18. Switching losses ● Quiescent current losses. Equation 39 Example (see Chapter 5.6): VIN=42 V, VFW_LED=3.7 V, nLED=8, ILED=1500 mA The typical output voltage is: Equation 40 RDSON_HS has a typical value of 200 Ω at 25 °C. P SW V IN I OUT T RISE T FALL + () 2 ----------------------------------------- F SW V IN = I OUT T SW_EQ F SW ⋅⋅ ⋅ ⋅ ⋅ ⋅ = AM13502v1 P Q V IN I Q ⋅ = V OUT n LED V FW_LED V FB + ⋅ 29.4V == |
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