XTR115: RLIM value

Yasushi Fujiwara

Part Number: XTR115
Other Parts Discussed in Thread: XTR117,

Hello Experts,

Would you tell the RLIM(red color portion in below figure) value, please? Customer would like to know it.

Best Regards,
Fujiwara

over 3 years ago

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Fujiwara,

these threads may interest you:

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/576026/xtr117-internal-rlim-value-stabilization-and-internal-regulation

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/755530/xtr117-4-20ma-2-wire-with-0-10v-3-option

As the XTR115 and XTR117 are very similar and show the same "Over-Scale Limit" specification, this should answer your question.

Kai

0 Raymond Zhang1 over 3 years ago

TI__Guru* 77501 points

Hi Fujiwara-san,

Yasushi Fujiwara said:
Would you tell the RLIM(red color portion in below figure) value

In the E2E previous post mentioned by Kai, Luis has answered the functionality of Rlim resistor.

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/755530/xtr117-4-20ma-2-wire-with-0-10v-3-option

https://www.ti.com/lit/ug/tiduao7/tiduao7.pdf?ts=1671216268061&ref_url=https%253A%252F%252Fwww.google.com%252F

The current gain of the Voltage to Current Converter has the current gain of 100 A/A. The function of Rlim is limiting the emitter currents of T1 and T2 to protect XTR115 and T2 transistor, see the simulation comparisons below.

XTR115 Rlimit 12162022.TSC

If you have additional questions, please let me know.

Best,

Raymond

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XTR115: RLIM value