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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6986H датащи(PDF) 30 Page - STMicroelectronics |
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L6986H датащи(HTML) 30 Page - STMicroelectronics |
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30 / 68 page  Figure 29. Valley current sense operation in overcurrent condition Figure 29. Valley current sense operation in overcurrent condition shows the switching frequency reduction during the valley current sense operation in case of extremely low duty cycle (VIN = 12 V, fSW = 2 MHz short-circuit condition). In a worst case scenario (like Figure 29. Valley current sense operation in overcurrent condition) of the overcurrent protection the switch current is limited to: IMAX=IVALLEYTH+VIN−VOUT L ⋅TMASKHS (15) where IVALLEY_TH is the current threshold of the valley sensing circuitry (see Table 5. Electrical characteristics) and TMASK_HS is the masking time of the high-side switch 100 ns 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. IMAX=IPEAK_TH (16) L6986H Overcurrent protection DS12905 - Rev 2 page 30/68 |
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