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LM2776DBVT データシート(PDF) 10 Page - Texas Instruments |
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LM2776DBVT データシート(HTML) 10 Page - Texas Instruments |
10 / 23 page 10 LM2776 SNVSA56A – MAY 2015 – REVISED FEBRUARY 2016 www.ti.com Product Folder Links: LM2776 Submit Documentation Feedback Copyright © 2015–2016, Texas Instruments Incorporated Feature Description (continued) Thermal shutdown is most often triggered by self-heating, which occurs when there is excessive power dissipation in the device and/or insufficient thermal dissipation. LM2776 power dissipation increases with increased output current and input voltage. When self-heating brings on thermal shutdown, thermal cycling is the typical result. Thermal cycling is the repeating process where the part self-heats, enters thermal shutdown (where internal power dissipation is practically zero), cools, turns on, and then heats up again to the thermal shutdown threshold. Thermal cycling is recognized by a pulsing output voltage and can be stopped be reducing the internal power dissipation (reduce input voltage and/or output current) or the ambient temperature. If thermal cycling occurs under desired operating conditions, thermal dissipation performance must be improved to accommodate the power dissipation of the LM2776. 7.3.5 Undervoltage Lockout The LM2776 has an internal comparator that monitors the voltage at VIN and forces the device into shutdown if the input voltage drops to 2.4 V. If the input voltage rises above 2.6 V, the LM2776 resumes normal operation. 7.4 Device Functional Modes 7.4.1 Shutdown Mode An enable pin (EN) pin is available to disable the device and place the LM2776 into shutdown mode reducing the quiescent current to 1 µA. In shutdown, the output of the LM2776 is pulled to ground by an internal pullup current source (approx 1.85 mA). 7.4.2 Enable Mode Applying a voltage greater than 1.2 V to the EN pin places the device into enable mode. When unloaded, the input current during operation is 120 µA. As the load current increases, so does the quiescent current. When enabled, the output voltage is equal to the inverse of the input voltage minus the voltage drop across the charge pump. |
同様の部品番号 - LM2776DBVT |
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同様の説明 - LM2776DBVT |
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