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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6986 датащи(PDF) 29 Page - STMicroelectronics |
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L6986 датащи(HTML) 29 Page - STMicroelectronics |
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29 / 68 page  DocID025376 Rev 7 29/68 L6986 Functional description 68 Figure 18. Valley current sense operation in overcurrent condition Figure 18 shows the switching frequency reduction during the valley current sense operation in case of extremely low duty cycle (VIN = 38 V, fSW = 500 kHz short-circuit condition). In worst case scenario (like Figure 18) of the overcurrent protection the switch current is limited to: Equation 15 where IVALLEY_TH is the current threshold of the valley sensing circuitry (see Table 5: Electrical characteristics on page 8) and TMASK_HS is the masking time of the high-side switch 100 nsec. typ.). In most of the overcurrent conditions the conduction time of the high-side switch is higher than the masking time and so the peak current protection limits the switch current. Equation 16 IMAX = IPEAK_TH IMAX IVALLEYTH VIN VOUT – L ------------------------------ TMASKHS + = |
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