AMC1301: AMC1301 reference schematic for three-phase three-wire design

Sammi Shang

Part Number: AMC1301
Other Parts Discussed in Thread: AMC1100, AMC1300

Dear team,

My customer will use AMC1301 measure voltage for three-phase three wire design, do you have any reference schematic for this? Or let me know how to measure with our AMC1301 EVM?

Thanks.

Best regards,

Sammi

over 5 years ago

0 Alexander Smith over 5 years ago

TI__Guru 55342 points

Hi Sammi,

I am not aware of a TI design for this with the AMC1301, however I found one similar for the AMC1100. https://www.ti.com/lit/ug/tidua58/tidua58.pdf?ts=1592405544729&ref_url=https%253A%252F%252Fwww.google.com%252F

You may want to check with the SEM team to see if there is a better design to show.

If using the AMC1301 for voltage measurement, the customer will need to implement an R3' resistor as shown in section 10.2.2 Isolated Voltage Sensing of the datasheet. Without this R3' resistor, the bias current flowing out of the positive input pin across the shunt resistor will create a large offset voltage.

When more details about the project are known, HV+, voltage division circuit, and desired input voltage range; I can help the customer size their shunt resistor R3 and R3'.

0 Alexander Smith over 5 years ago

TI__Guru 55342 points

Hi Sammi,

If possible, please promote the AMC1300. It is pin to pin and performance compatible.

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AMC1301: AMC1301 reference schematic for three-phase three-wire design