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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4253AIGN-ADJ датащи(PDF) 13 Page - Linear Technology |
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LTC4253AIGN-ADJ датащи(HTML) 13 Page - Linear Technology |
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13 / 32 page  LTC4253A-ADJ 13 4253a-adjf OPERATIO comparator with a threshold of 200mV detects overshoot and pulls GATE low much harder and hence much faster than the weaker current limit loop. The VACL/RS current limit loop then takes over, and servos the current as previously described. As before, TIMER runs and shuts down LTC4253A-ADJ when CT reaches 4V. If CT reaches 4V, the LTC4253A-ADJ latches off with a 5µA pull-up current source. The LTC4253A-ADJ circuit breaker latch is reset by either pulling the RESET pin active high for >20 µs, pulling UVL/UV momentarily low, dropping the input voltage VIN below the internal UVLO threshold or pulsing TIMER momentarily low with a switch. Although short-circuits are the most obvious fault type, several operating conditions may invoke overcurrent protection. Noise spikes from the backplane or load, input steps caused by the connection of a second, higher voltage supply, transient currents caused by faults on adjacent circuit boards sharing the same power bus or the insertion of non-hot swappable products could cause higher than anticipated input current and temporary de- tection of an overcurrent condition. The action of TIMER and CT rejects these events allowing the LTC4253A-ADJ to “ride out” temporary overloads and disturbances that could trip a simple current comparator and, in some cases, blow a fuse. |
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