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LM340T-15 Datenblatt(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Teilenummer LM340T-15
Bauteilbeschribung  Series 3-Terminal Positive Regulators
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM340T-15 Datenblatt(HTML) 7 Page - National Semiconductor (TI)

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Typical Performance Characteristics (Continued)
Equivalent Schematic
Application Hints
The LM340/LM78XX series is designed with thermal protec-
tion, output short-circuit protection and output transistor safe
area protection. However, as with
any IC regulator, it be-
comes necessary to take precautions to assure that the
regulator is not inadvertently damaged. The following de-
scribes possible misapplications and methods to prevent
damage to the regulator.
Shorting the Regulator Input: When using large capacitors
at the output of these regulators, a protection diode con-
nected input to output (
Figure 1) may be required if the input
is shorted to ground. Without the protection diode, an input
short will cause the input to rapidly approach ground poten-
tial, while the output remains near the initial V
OUTbecause of
the stored charge in the large output capacitor. The capacitor
will then discharge through a large internal input to output di-
ode and parasitic transistors. If the energy released by the
capacitor is large enough, this diode, low current metal and
the regulator will be destroyed. The fast diode in
Figure 1 will
shunt most of the capacitors discharge current around the
regulator. Generally no protection diode is required for val-
ues of output capacitance
≤ 10 µF.
Raising the Output Voltage above the Input Voltage:
Since the output of the device does not sink current, forcing
Line Regulation
140AK-5.0, I
OUT = 1A, TA = 25˚C
DS007781-5
Line Regulation
140AK-5.0, V
IN = 10V, TA = 25˚C
DS007781-6
DS007781-7
www.national.com
7


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