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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC2440AEVB датащи(PDF) 11 Page - Semtech Corporation |
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SC2440AEVB датащи(HTML) 11 Page - Semtech Corporation |
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11 / 28 page  General Description (Continued) SC2440A causes the converter output voltage to fall below 72% of its set point, then the converter will be shut off immediately, without waiting for V COMP to rise to its clamp level. The con- verter restarts after timing out. The output power good comparator indicates that the channel output voltage has risen to within 0% of its set value. Each regulator of the SC2440A has its own output good comparator. The open collector output of the voltage ready comparator will be actively pulled low if the corre- sponding feedback voltage is below 0.9V. enabling SS discharge. The net soft-start capacitor discharg- ing current is I D - IC ≈ .2µA. The switching regulator remains off until the soft-start capacitor is discharged below V. At this moment, the SS discharge latch is reset. The soft-start capacitor is recharged and the converter again undergoes soft-start, delaying converter restart until the hiccup cycle completes, reducing power dissipation in overload. The regulator will go through soft-start, overload shutdown and restart until it is no longer overloaded. Comparator X 4 resets latch X3 during initial start-up or before recover- ing from overload shutdown. Comparator X 5 monitors the output voltage after hiccup is armed. If excessive overload |
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