8 Current Sense
The TPS272C45EVM has the ability to allow the user to sense the output current of the device through the SNS
pin. This ability can be done by either:
• Connecting an external voltmeter to test point
TP7
• Connecting an external microcontroller via the BoosterPack headers and sample/convert using the
microcontroller's ADC
In the case that the microcontroller's ADC is sampling the SNS pin, it can required to populate a Zener diode on
pin
D7
to regulate the maximum voltage going into the microcontroller's analog input. By default a 1-kΩ resistor
is used as the SNS resistor (
R15
), however, depending on the ADC reference used on the microcontroller it can
be desired to limit the voltage by use of the Zener diode. The
R15
pin's footprint is populated in a 0805 package
to allow for easy soldering and desoldering.
Current Sense
SLVUBV4A – DECEMBER 2020 – REVISED DECEMBER 2021
TPS272C45 Evaluation Module
11
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