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[FAQ] TIDA-01599: What are the benefits of using ISO1212 in the implementation of safe torque off functionality in Variable Speed Drives?

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Part Number: TIDA-01599

What are the benefits of using ISO1212 (Isolated 24-V to 60-V Digital Input Receiver) in the implementation of safe torque off functionality in Variable Speed Drives?

  • TIDA-01599 is a TI Reference Design that implements safe torque off functionality in variable speed drives (per IEC61800-5-2). 

    ISO1212, which is an Isolated 24-V to 60-V Digital Input Receiver, offers the following benefits to implement safe torque off

      • Reduced external discrete components when compared to optocouplers for correctly interpreting user defined logic 0 and 1 per IEC 61131-2
      • Less temperature rise of the component due to constant input current drawn by the device
      • No ageing issue unlike Optocouplers
      • ±60-V input tolerance with reverse polarity protection meeting safety requirements
      • Field side pin shorts leading to safe failure
      • Option for single or dual device in one package to meet redundancy

    For additional information about this topic, please refer to section 2.6 "System Design Theory" of the User Guide for TIDA-01599.

    You can also download the design files (BOM, Schematic, Gerber) for this reference design from the TIDA-01599 folder.

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