Hello,
I use mcp39f521 Power Monitoring IC.
According to demo board schematic, there is a resistor R5.
I could not understand the purpose of this resistor.
The AC current is sensed via shunt resistor 2m ohm.
Why R5: 2,49ohm is used?
According to the datasheet "Differential Input Voltage Range" of I1+ and I1- pins is +-600mV/GAIN.
So I want to measure 50A(peak) AC current, what should be the shunt resistor value?
For example: 500mv/50A= 10mOhm , is this calculation correct? (500mV for safety margin)
If this example is correct, why 2,49 ohm is used?
I would be glad to share your ideas.
Thanks.
I use mcp39f521 Power Monitoring IC.
According to demo board schematic, there is a resistor R5.
I could not understand the purpose of this resistor.
The AC current is sensed via shunt resistor 2m ohm.
Why R5: 2,49ohm is used?
According to the datasheet "Differential Input Voltage Range" of I1+ and I1- pins is +-600mV/GAIN.
So I want to measure 50A(peak) AC current, what should be the shunt resistor value?
For example: 500mv/50A= 10mOhm , is this calculation correct? (500mV for safety margin)
If this example is correct, why 2,49 ohm is used?
I would be glad to share your ideas.
Thanks.
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