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XTR116: Without Q1 Transistor

Part Number: XTR116
Other Parts Discussed in Thread: XTR115,

Hi,

Can we eliminate below Q1 if thermal condition is not problem?

Best Regards,

Kuramochi

  • Hi TQ,

    omitting Q1 will change the output circuitry and all involved current and voltage levels. Also, the internal transistor is not suited to deliver all the output current. It would heat up as much as the external transistor, but on the much much smaller die of XTR115. This can enormeously heat up the XTR115 and you risk to damage the chip. The least what you get is an increased temperature related error.

    Kai   

  • Hello Kuramochi-san,

    Thank you for your post.

    In applications where you decide to omit the external transistor and rely only on the internal transistor of the XTR116, you can expect worse performance. The power dissipated in this internal transistor heats up the IC and causes temperature drift errors for the front-end circuitry. The external transistor is suggested to avoid these on-chip thermal induced errors. However, if the supply voltage you're using keeps the power dissipation in the internal transistor low, then the application may not suffer too much. 

    -Tamara Alani