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LM78M05-MIL データシート(PDF) 9 Page - Texas Instruments

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部品番号 LM78M05-MIL
部品情報  Series 3-Terminal 500-mA Positive Voltage Regulator
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM78M05-MIL データシート(HTML) 9 Page - Texas Instruments

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LM78M05-MIL
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SNVSAX6 – JUNE 2017
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Copyright © 2017, Texas Instruments Incorporated
7.3 Feature Description
The LM78M05-MIL fixed voltage regulator has built-in thermal overload protection which prevents the device
from being damaged due to excessive junction temperature.
The regulator also contains internal short-circuit protection which limits the maximum output current, and safe-
area protection for the pass transistor which reduces the short-circuit current as the voltage across the pass
transistor is increased.
Although the internal power dissipation is automatically limited, the maximum junction temperature of the device
must be maintained below 125°C to meet data sheet specifications. An adequate heat sink must be provided to
assure this limit is not exceeded under worst-case operating conditions (maximum input voltage and load
current) if reliable performance is to be obtained.
7.4 Device Functional Modes
7.4.1 Normal Operation
The device OUTPUT pin sources current necessary to make the voltage at the OUTPUT pin equal to the fixed
voltage level of the device.
7.4.2 Operation With Low Input Voltage
The device requires up to 2-V headroom (VIN – VOUT) to operate in regulation. With less headroom, the device
may drop out of regulation in which the OUTPUT voltage would equal INPUT voltage minus dropout voltage.
7.4.3 Operation in Self Protection
When an overload occurs, the device shuts down Darlington NPN output stage or reduce 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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