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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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A6986F 数据表(PDF) 32 Page - STMicroelectronics |
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A6986F 数据表(HTML) 32 Page - STMicroelectronics |
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32 / 72 page  Functional description A6986F 32/72 DocID027739 Rev 1 sense threshold. The low-side operation is able to prevent the high-side turn on, so the device can skip pulses decreasing the swathing frequency. Figure 23. Valley current sense operation in overcurrent condition Figure 23 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 a worst case scenario (like Figure 23) 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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