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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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R5975D датащи(PDF) 35 Page - STMicroelectronics |
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R5975D датащи(HTML) 35 Page - STMicroelectronics |
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35 / 47 page  DocID026878 Rev 1 35/47 R5975D Application information 47 Figure 21. Short-circuit current VIN = 36 V 8.6 Positive buck-boost regulator The device can be used to implement a step-up/down converter with a positive output voltage. The output voltage is given by: Equation 37 where the ideal duty cycle D for the buck-boost converter is: Equation 38 However, due to power losses in the passive elements, the real duty cycle is always higher than this. The real value (that can be measured in the application) should be used in the following formulas. The peak current flowing in the embedded switch is: Equation 39 VOUT VIN D 1D – ------------- = D VOUT VIN VOUT + ------------------------------ = ISW ILOAD 1D – --------------- IRIPPLE 2 -------------------- + ILOAD 1D – --------------- VIN 2L ----------- D fSW --------- + == |
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