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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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34726 датащи(PDF) 13 Page - Freescale Semiconductor, Inc |
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34726 датащи(HTML) 13 Page - Freescale Semiconductor, Inc |
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13 / 19 page  Analog Integrated Circuit Device Data Freescale Semiconductor 13 34726 FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES OVER-TEMPERATURE PROTECTION To limit its operating temperature, the 34726 shuts down if the junction temperature of the switching MOSFET surpasses 140°C. If the junction temperature subsequently drops to 130°C, the 34726 re-starts. SOFT-START OPERATION To limit the in-rush current, an internal timer controls the output voltage ramp after the part is enabled. The start-up time is internally set to approximately 2.0ms and is independent of input voltage, output voltage, or load current. The soft-start sequence also occurs upon recovery from any fault condition. UNDER-VOLTAGE LOCK-OUT The UVLO threshold is set to 2.7V for rising VIN, and to 2.5V for falling VIN. For a VOUT of 3.3V, the VOUT value will track VIN below 3.6V until the 2.5V falling VIN threshold is reached. If the UVLO falling threshold is met, the part shuts down and will power up again with soft-start, when the UVLO rising threshold is surpassed. |
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