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AMC1301: short circuit protection additional information

Michael T Schneider
Expert 3790 points
Part Number: AMC1301
Other Parts Discussed in Thread: AMC1300

Hey Team,

Could you help me out on getting some information on a TI part.  For the AMC1301, the datasheet shows that it has short circuit protection on the output is up to +/- 13mA and an output resistance of <0.2Ω. 

 

  1. Can you explain in a little bit more detail on how the output short-circuit protection works?  I looked under the fail-safe section of 9.3.2 but it didn’t say much about the output current.
    1. How does the output resistance change whenever short-circuit protection is occurring?
  2. Can the output current transiently exceed +/-13mA?  For instance, let’s say if it went to +/-30mA for 100us?
  3. For the inputs, can the differential voltage be 250mV with a common mode (Vcm) of -250mV (V+= -135mV and V-= -385mV)?
  • +1
    TI__Guru 55322 points

    Hi Michael,

    The AMC1301 is an older device and I recommend considering the AMC1300 instead. The AMC1300 is pin to pin compatible and is a direct replacement. 

    1. We have ESD diodes on the output that protect the output structure from short-circuit events.

    2. Since only a typical value and not a maximum value is specified, it is possible to exceed the typical value of +/-13mA. If short-circuit events are expected to occur in the end equipment, I recommend adding additional resistance to the outputs to further limit the current draw and reduce the chance of damaging the device. 

    3. As specified in the datasheet, the common-mode input range is limited to -160mV.