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LF155H Folha de dados(PDF) 11 Page - National Semiconductor (TI) |
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LF155H Folha de dados(HTML) 11 Page - National Semiconductor (TI) |
11 / 23 page Application Hints (Continued) reversal of phase to the output. Exceeding the negative common-mode limit on both inputs will force the amplifier output to a high state. In neither case does a latch occur since raising the input back within the common-mode range again puts the input stage and thus the amplifier in a normal operating mode. Exceeding the positive common-mode limit on a single input will not change the phase of the output however, if both inputs exceed the limit, the output of the amplifier will be forced to a high state. These amplifiers will operate with the common-mode input voltage equal to the positive supply. In fact, the common-mode voltage can exceed the positive supply by approximately 100 mV independent of supply voltage and over the full operating temperature range. The positive sup- ply can therefore be used as a reference on an input as, for example, in a supply current monitor and/or limiter. 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. All of the bias currents in these amplifiers are set by FET current sources. The drain currents for the amplifiers are therefore essentially independent of supply voltage. 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 “pickup” 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 3dB frequency of the closed loop gain and consequently there is negligible effect on stability margin. However, if the feedback pole is less than approximately six times the expected 3 dB frequency a lead capacitor should be placed from the output to the input of the op amp. The value of the added capacitor should be such that the RC time constant of this capacitor and the resistance it parallels is greater than or equal to the original feedback pole time constant. Typical Circuit Connections V OS Adjustment 00564667 • V OS is adjusted with a 25k potentiometer • The potentiometer wiper is connected to V + • For potentiometers with temperature coefficient of 100 ppm/˚C or less the additional drift with adjust is ≈ 0.5µV/ ˚C/mV of adjustment • Typical overall drift: 5µV/˚C ±(0.5µV/˚C/mV of adj.) Driving Capacitive Loads 00564668 * LF155/6 R = 5k LF357 R = 1.25k Due to a unique output stage design, these amplifiers have the ability to drive large capacitive loads and still maintain stability. C L(MAX) . 0.01µF. Overshoot ≤ 20% Settling time (t s) . 5µs LF357. A Large Power BW Amplifier 00564615 For distortion ≤ 1% and a 20 Vp-p VOUT swing, power bandwidth is: 500kHz. www.national.com 11 |
Nº de peça semelhante - LF155H |
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Descrição semelhante - LF155H |
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