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TLV2171: short circuit current

justifice zhou
Intellectual 400 points
Part Number: TLV2171

Hi,

in the datasheet, the short circuit current of TLV2171 is 25mA source and 35mA sink.

And there is also a plot shows Output Voltage Swing vs Output Current in Figure 5.

Does it mean that if the output voltage swings from V+ to 0V, the curve will intersect with X axis at 25mA?

And when output voltage swings from V- to 0V, the curve will intersect with X axis at 35mA?

May I know what limit the short circuit current?

Does this parameter has any limit on the subsequent circuit?

  • 0
    Guru 275410 points

    The short-circuit current can be measured with the output shorted either to ground, or to the opposite power rail, i.e., ±18 V. The datasheet forgot to specify the test condition.

    The current limits are characteristics of the output transistors. (Increasing the drive strength of the output transistors would require using MOSFETs with a larger gate charge, which would require more power to (dis)charge the gate at the same speed.)

    The short-circuit current itself is not a useful specification for circuit design, because a shorted output does not have a useful voltage. (To find out what voltage range you have at what output current, see figure 5.) But it allows you to estimate how the drive strength changes; see, e.g., figure 23.

  • 0 in reply to Clemens Ladisch
    Intellectual 400 points

    So short-circuit current is irrelevant with Output Voltage Swing vs Output Current in Figure 5?

  • +1 in reply to justifice zhou
    Guru 275410 points

    The short-circuit current shows where the curve intersects the X axes at 0 V or ±18 V.