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NCS2002SN2T1G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCS2002SN2T1G Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 16 page  NCS2002, NCV2002 http://onsemi.com 11 Output The output stage consists of complementary P and N channel devices connected to provide rail−to−rail output drive. With a 2.0 k load, the output can swing within 50 mV of either rail. It is also capable of supplying over 75 mA when powered from 5.0 V and 1.0 mA when powered from 0.9 V. When connected as a unity gain follower, the NCS2002 can directly drive capacitive loads in excess of 820 pF at room temperature without oscillating but with significantly reduced phase margin. The unity gain follower configuration exhibits the highest bandwidth and is most prone to oscillations when driving a high value capacitive load. The capacitive load in combination with the amplifier’s output impedance, creates a phase lag that can result in an under−damped pulse response or a continuous oscillation. Figure 35 shows the effect of driving a large capacitive load in a voltage follower type of setup. When driving capacitive loads exceeding 820 pF, it is recommended to place a low value isolation resistor between the output of the op amp and the load, as shown in Figure 34. The series resistor isolates the capacitive load from the output and enhances the phase margin. Refer to Figure 36. Larger values of R will result in a cleaner output waveform but excessively large values will degrade the large signal rise and fall time and reduce the output amplitude. Depending upon the capacitor characteristics, the isolation resistor value will typically be between 50 to 500 W. The output drive capability for resistive and capacitive loads is shown in Figures 2, 3, and 23. Figure 34. Capacitance Load Isolation + - Output R Isolation resistor R = 50 to 500 CL Input Note that the lowest phase margin is observed at cold temperature and low supply voltage. Enable Pin The enable pin allows the user to externally control the device. if the enable pin is pulled below the input disable threshold voltage (VEN < 45% VCC), the amplifier is disabled. Once the enable pin is taken above the threshold voltage (VEN = 60% VCC), the amplifier will turn on. In the event the enable pin is not connected, the amplifier will remain on by default |
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