Datasheet

LM8261
www.ti.com SNOS469I –APRIL 2000–REVISED MARCH 2013
For the LM8261, the available output current increases with the input overdrive. Referring to Figure 53 and
Figure 54, Output Short Circuit Current vs. Input Overdrive, it can be seen that both sourcing and sinking short
circuit current increase as input overdrive increases. In a closed loop amplifier configuration, during transient
conditions while the fed back output has not quite caught up with the input, there will be an overdrive imposed on
the input allowing more output current than would normally be available under steady state condition. Because of
this feature, the Op Amp's output stage quiescent current can be kept to a minimum, thereby reducing power
consumption, while enabling the device to deliver large output current when the need arises (such as during
transients).
Figure 53. Output Short Circuit Sourcing Current vs. Input Overdrive
Figure 54. Output Short Circuit Sinking Current vs. Input Overdrive
Figure 55 shows the output voltage, output current, and the resulting input overdrive with the device set for A
V
=
+1 and the input tied to a 1V
PP
step function driving a 47nF capacitor. As can be seen, during the output
transition, the input overdrive reaches 1V peak and is more than enough to cause the output current to increase
to its maximum value (see Figure 53 and Figure 54 plots). Note that because of the larger output sinking current
compared to the sourcing one, the output negative transition is faster than the positive one.
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