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AN2870 データシート(PDF) 31 Page - STMicroelectronics |
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AN2870 データシート(HTML) 31 Page - STMicroelectronics |
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31 / 41 page  AN2870 Designing with L6585DE 31/41 Equation 38 And the power rating to: Equation 39 The real maximum inductor current and lamp voltage can be calculated considering the maximum threshold value and the tolerances related with value of Rhbcs and Lres. The design of the inductor proceeds as indicated in Eq 7. The resonance capacitor is preferably a metallized polyester film capacitor. Blocking capacitor is around ten times the resonant one: a value greater or equal to 100 nF for the polyester capacitor is usually chosen. Parameters setting In order to fix the run frequency and the preheating frequency, the following curves can be used. Each curve is related with a particular capacitor value, therefore a capacitor value must be firstly chosen. The resistances corresponding Frun and Fpre can be graphically found and are respectively Rrun and the parallel between Rrun and Rpre. Figure 16. Oscillator characteristic curves 2 I I pk , lamp RMS , hbcs ≈ 2 hbcs hbcs RMS , hbcs I R P ⋅ ≈ |
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