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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4158 датащи(PDF) 30 Page - STMicroelectronics |
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AN4158 датащи(HTML) 30 Page - STMicroelectronics |
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30 / 34 page  Setup and optimization AN4158 30/34 DocID023635 Rev 2 Figure 25. TOFF_FAST and TON_MIN parameter relations 5.1.4 FAST_STEP The FAST_STEP parameter defines the fast decay duration used at current reference changes; the shorter fast decay value (FAST_STEP/4) is used in the first falling steps, then the algorithm increases the fast time up to the longer value (FAST_STEP) which is used in the final part of the sinewave (see Figure 26 and Section 4.1.2 on page 24). t ON_MIN Reference current Reference current t ON_MIN t ON_MIN t ON_MIN t ON_MIN t on t on t OFF_FAST /8 t OFF_FAST /4 The fast decay time and the following on-time are almost equal. if t OFF_FAST /8 < t ON_MIN than t on< tON_MIN The minimum fast decay time (t OFF_FAST /8) ON_MIN limit. A second fast decay is always necessary. if t OFF_FAST /8 > tON_MIN than ton > tON_MIN The minimum fast decay time (t OFF_FAST /8) ON_MIN limit. never satisfies the t could satisfy the t AM15127v1 |
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