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LM338-MIL 데이터시트(PDF) 10 Page - Texas Instruments |
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LM338-MIL 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 28 page 10 LM338-MIL SNVSAX2 – JUNE 2017 www.ti.com Product Folder Links: LM338-MIL Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7.4 Device Functional Modes 7.4.1 Normal Operation The device OUTPUT pin sources current necessary to make OUTPUT pin 1.25 V greater than ADJUST terminal to provide output regulation. 7.4.2 Operation With Low Input Voltage The device requires up to 3-V headroom (VI – VO) to operate in regulation. With less headroom, the device may drop out and OUTPUT voltage is INPUT voltage minus drop out voltage. 7.4.3 Operation at Light Loads The device passes its bias current to the OUTPUT pin. The load or feedback must consume this minimum current for regulation or the output may be too high. A 250-Ω feedback resistor between OUTPUT and ADJUST consumes the worst case minimum load current of 5 mA. 7.4.4 Operation in Self Protection When an overload occurs, the device shuts down Darlington NPN output stage or reduces the output current to prevent device damage. The device automatically resets from the overload. The output may be reduced or alternate between on and off until the overload is removed. |
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