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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L5988D датащи(PDF) 22 Page - STMicroelectronics |
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L5988D датащи(HTML) 22 Page - STMicroelectronics |
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22 / 52 page  Functional description L5988D 22/52 DocID15324 Rev 4 The typical active thresholds in case of ILIM-ADJ pin left floating are IPEAK_TH = 4.0 A, IVALLEY_TH = 4.7 A. The dimensioning of the pull up resistor versus VREF to decrease the peak (and valley) thresholds follows the formula: Equation 8 In the same way the pull down resistor is selected using the following formula to increase the maximum current thresholds: Equation 9 Figure 11. Constant current protection at extreme duty cycles R9 1.2 · 10 5 4.0 IPEAK_TH – ------------------------------------- = R3 2.706 · 10 5 IPEAK_TH 4.0 – ------------------------------------- = Valley current limit skipped switching pulses Constant current protection during soft start time soft start time ZOOM HICCUP protection Is triggered at the end of the SS time Valley current limit skipped switching pulses Constant current protection during soft start time soft start time ZOOM HICCUP protection Is triggered at the end of the SS time |
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