SM73301 Datasheet, PDF (17/22 Pages) Texas Instruments – RRIO, High Output Current & Unlimited Cap Load Op Amp in SOT23-5

Output Voltage vs. Output Current plot (Typical Performance
Characteristics section) can be used to predict the output
swing. Figure 6 and Figure 7 show this performance along
with several load lines corresponding to loads tied between
the output and ground. In each cases, the intersection of the
device plot at the appropriate temperature with the load line
would be the typical output swing possible for that load. For
example, a 1KΩ load can accommodate an output swing to
within 250mV of V^− and to 330mV of V⁺ (V_S = ±15V) corre-
sponding to a typical 29.3V_PP unclipped swing.
30157656
FIGURE 4. Output Short Circuit Sinking Current vs. Input
Overdrive
Figure 5 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 over-
drive reaches 1V peak and is more than enough to cause the
output current to increase to its maximum value (see Figure
3 and Figure 4 plots). Note that because of the larger output
sinking current compared to the sourcing one, the output neg-
ative transition is faster than the positive one.
30157660
FIGURE 6. Output Sourcing Characteristics with Load
Lines
30157639
FIGURE 5. Buffer Amplifier scope photo
ESTIMATING THE OUTPUT VOLTAGE SWING
It is important to keep in mind that the steady state output
current will be less than the current available when there is
an input overdrive present. For steady state conditions, the
30157659
FIGURE 7. Output Sinking Characteristics with Load
Lines
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