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L6985F 数据表(PDF) 30 Page - STMicroelectronics |
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L6985F 数据表(HTML) 30 Page - STMicroelectronics |
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30 / 65 page  Functional description L6985F 30/65 DocID027836 Rev 2 Figure 21. Valley current sense operation in overcurrent condition Figure 21 shows the switching frequency reduction during the valley current sense operation in case of an extremely low duty cycle (VIN = 38 V, fSW = 2 MHz short-circuit condition). In a worst case scenario (like in Figure 21) 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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