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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) 39 Page - STMicroelectronics |
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A5974AD датащи(HTML) 39 Page - STMicroelectronics |
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39 / 49 page  A5974AD Application information Doc ID 018762 Rev 1 39/49 Figure 28. 350 mA LED boost current source The device is powered from the output voltage so the maximum voltage drop across the LEDs and resistor sense is 36 V. The output voltage is given by: Equation 42 where the ideal duty cycle D for the boost converter is: Equation 43 As for positive and inverting buck-boost (see Section 8.6 and Section 8.7) the measured real duty cycle must be used to calculate the switch current level. The peak current flowing in the embedded switch is: Equation 44 while its average current is equal to: Equation 45 This is due to the fact that the current flowing through the internal power switch is delivered to the output only during the OFF phase. The switch peak current must be lower than the minimum current limit of the overcurrent protection (see Table 4 for details) while the average current must be lower than the rated DC current of the device. V OUT V IN 1D – ------------- = D V OUT V IN – V OUT ------------------------------ = I SW I LOAD 1D – --------------- I RIPPLE 2 -------------------- + I LOAD 1D – --------------- V IN 2L ⋅ ----------- D f SW --------- ⋅ + == I SW I LOAD 1D – --------------- = |
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