Weird resistor with dots around it

by AlfroJang80   Last Updated August 13, 2019 20:25 PM

I was looking through the LT4041 datasheet and saw this:

enter image description here

The 10mOhm resistor with the two nodes really close to it - is that a "special" resistor or something? Why have they drawn it like that?

Tags : resistors


Answers 2


It is a regular sense resistor with a kelvin connection. The dots are there to show a connection with the wires. A kelvin connection measures the current through the sense resistor for the DC to DC converter. It is important to make the connection to avoid parasitic resistance in the traces as shown below.

enter image description here Source: 4-terminal shunt resistor

Voltage Spike
Voltage Spike
August 13, 2019 20:14 PM

Those are just junction dots like all of the others nearby, to show where 3 wires connect. This is called a Kelvin connection. The idea is that the connection should be as close as possible to the resistor. There are also some 4-terminal resistors made especially for this purpose.

See Four-terminal sensing on Wikipedia for more information.

Justin
Justin
August 13, 2019 20:14 PM

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