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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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LF347M Folha de dados(PDF) 8 Page - National Semiconductor (TI) |
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LF347M Folha de dados(HTML) 8 Page - National Semiconductor (TI) |
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8 / 13 page  Application Hints (Continued) Exceeding the positive common-mode limit on a single input will not change the phase of the output; however, if both in- puts exceed the limit, the output of the amplifier will be forced to a high state. The amplifiers will operate with a common-mode input volt- age equal to the positive supply; however, the gain band- width and slew rate may be decreased in this condition. When the negative common-mode voltage swings to within 3V of the negative supply, an increase in input offset voltage may occur. Each amplifier is individually biased by a zener reference which allows normal circuit operation on ±4.5V power sup- plies. Supply voltages less than these may result in lower gain bandwidth and slew rate. The LF147 will drivea2k Ω load resistance to ±10V over the full temperature range. If the amplifier is forced to drive heavier load currents, however, an increase in input offset voltage may occur on the negative voltage swing and finally reach an active current limit on both positive and negative swings. Precautions should be taken to ensure that the power supply for the integrated circuit never becomes reversed in polarity or that the unit is not inadvertently installed backwards in a socket as an unlimited current surge through the resulting forward diode within the IC could cause fusing of the internal conductors and result in a destroyed unit. As with most amplifiers, care should be taken with lead dress, component placement and supply decoupling in order to ensure stability. For example, resistors from the output to an input should be placed with the body close to the input to minimize “pick-up” and maximize the frequency of the feed- back pole by minimizing the capacitance from the input to ground. A feedback pole is created when the feedback around any amplifier is resistive. The parallel resistance and capacitance from the input of the device (usually the inverting input) to AC ground set the frequency of the pole. In many instances the frequency of this pole is much greater than the expected 3 dB frequency of the closed loop gain and consequently there is negligible effect on stability margin. However, if the feed- back pole is less than approximately 6 times the expected 3 dB frequency a lead capacitor should be placed from the out- put to the input of the op amp. The value of the added ca- pacitor should be such that the RC time constant of this ca- pacitor and the resistance it parallels is greater than or equal to the original feedback pole time constant. Detailed Schematic DS005647-9 www.national.com 8 |
Nº de peça semelhante - LF347M |
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Descrição semelhante - LF347M |
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