RCL question???

5150ed · 3rd September 2006, 10:40 PM

Is the resistor current limit is only a common resistor or a resistor with coil?

glennb · 4th September 2006, 05:25 AM

Quote:

Originally posted by 5150ed
Is the resistor current limit is only a common resistor or a resistor with coil?

Your image is from the Burr-Brown OPA541 datasheet. The opening paragraph of the datasheet makes it quite clear:
"Internal current limit circuitry can be user-programmed with a single external resistor, protecting the amplifier and load from fault conditions."
Page 6 describes the feature in detail.

glennb · 4th September 2006, 05:44 AM

On further examination, it looks like someone has doctored an image cut from the datasheet, added the R1/C1 Zobel network and removed the 'External' caption from below R_CL.

The datasheet does not refer to using a Zobel, so R_CL does not include the resistance of a coil (inductor).

I would put a Zobel (whether R/C or R/L/C) *after* R_CL, so that it is more closely associated with the load.

5150ed · 5th September 2006, 02:43 AM

Thank u so much Glennb.

4th September 2006, 05:44 AM	#3
glennb diyAudio Member Join Date: May 2004 Location: Melbourne	On further examination, it looks like someone has doctored an image cut from the datasheet, added the R1/C1 Zobel network and removed the 'External' caption from below R_CL. The datasheet does not refer to using a Zobel, so R_CL does not include the resistance of a coil (inductor). I would put a Zobel (whether R/C or R/L/C) after R_CL, so that it is more closely associated with the load. __________________ Glenn.

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5th September 2006, 02:43 AM	#4
5150ed diyAudio Member Join Date: Jul 2005 Location: BKK	Thank u so much Glennb.

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