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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6599AD датащи(PDF) 17 Page - STMicroelectronics |
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L6599AD датащи(HTML) 17 Page - STMicroelectronics |
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17 / 35 page  L6599A Application information Doc ID 15308 Rev 7 17/35 Figure 22. Oscillator internal block diagram The following approximate relationships hold for the minimum and the maximum oscillator frequency respectively: Equation 1 After fixing CF in the hundred pF or in the nF (consistently with the maximum source capability of the RFmin pin and trading this off against the total consumption of the device), the value of RFmin and RFmax is selected so that the oscillator frequency is able to cover the entire range needed for regulation, from the minimum value fmin (at minimum input voltage and maximum load) to the maximum value fmax (at maximum input voltage and minimum load): Equation 2 A different selection criterion is given for RFmax in case burst mode operation at no load is used (see Section 7.2: Operation at no load or very light load). () max min max min min RF // RF CF 3 1 f ; RF CF 3 1 f ⋅ ⋅ = ⋅ ⋅ = 1 f f RF RF ; f CF 3 1 RF min max min max min min − = ⋅ ⋅ = |
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