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LM340T-15 Datenblatt(PDF) 7 Page - National Semiconductor (TI) |
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LM340T-15 Datenblatt(HTML) 7 Page - National Semiconductor (TI) |
7 / 15 page 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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