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LMV716 데이터시트(PDF) 9 Page - Texas Instruments |
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LMV716 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 25 page LMV716 www.ti.com SNOSAT9B – APRIL 2006 – REVISED MARCH 2013 APPLICATION INFORMATION With the low supply current of only 1.6 mA, the LMV716 offers users the ability to maximize battery life. This makes the LMV716 ideal for battery powered systems. The LMV716’s rail-to-rail output swing provides the maximum possible dynamic range at the output. This is particularly important when operating on low supply voltages. CAPACITIVE LOAD TOLERANCE The LMV716, when in a unity-gain configuration, can directly drive large capacitive loads in unity-gain without oscillation. The unity-gain follower is the most sensitive configuration to capacitive loading; direct capacitive loading reduces the phase margin of amplifiers. The combination of the amplifier’s output impedance and the capacitive load induces phase lag. This results in either an underdamped pulse response or oscillation. To drive a heavier capacitive load, the circuit in Figure 26 can be used. Figure 26. Indirectly Driving a Capacitive Load using Resistive Isolation In Figure 26, the isolation resistor RISO and the load capacitor CL form a pole to increase stability by adding more phase margin to the overall system. The desired performance depends on the value of RISO. The bigger the RISO resistor value, the more stable VOUT will be. The circuit in Figure 27 is an improvement to the one in Figure 26 because it provides DC accuracy as well as AC stability. If there were a load resistor in Figure 26, the output would be voltage divided by RISO and the load resistor. Instead, in Figure 27, RF provides the DC accuracy by using feed-forward techniques to connect VIN to RL. Due to the input bias current of the LMV716, the designer must be cautious when choosing the value of RF. CF and RISO serve to counteract the loss of phase margin by feeding the high frequency component of the output signal back to the amplifier’s inverting input, thereby preserving phase margin in the overall feedback loop. Increased capacitive drive is possible by increasing the value of CF. This in turn will slow down the pulse response. Figure 27. Indirectly Driving a Capacitive Load with DC Accuracy Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LMV716 |
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