AMC1301: the PIN4(GND1) of AMC1301 connection problem

Ethan Ku

Part Number: AMC1301

Hi all

AMC1301 is designed to detect three phase(R/S/T) protection for OVP then we decide not to used to shunt resistor at our project . There are two different connections. One is not same connection at GND1(PIN4) based on datasheet application . Additionally, the other involves leaving the green line unconnected to the shunt resistor.

our schematic has been tested and result would be ok. The differential between INP and INN is within 250mV. Therefore, could you please confirm if the AMC1301 is suitable for our application?"

over 1 year ago

0 Eva Mason over 1 year ago

TI__Expert 6015 points

Hi Ethan,

Is the first schematic what you have in plan right now?

Generally, a shunt resistor is recommended to reduce the effect of bias current. In an application for voltage sensing, the shunt resistor is typically larger. May I ask why you want to omit the shunt resistor?

If your input is +/-250mV and your results are what you expect, it sounds like the AMC1301 works for your application. You can also refer to section 8.2.2 for more information on design procedure.

Best regards,

Eva

0 Ethan Ku over 1 year ago in reply to Eva Mason

Prodigy 80 points

hi Mason

thank for your great supporting

May I ask why you want to omit the shunt resistor?

Ethan:the AMC1301 is used to detect three-phase Voltage applications so that does not shunt the resistor. how do you think it is a correct design?

0 Eva Mason over 1 year ago in reply to Ethan Ku

TI__Expert 6015 points

Hi Ethan,

We recommend including a shunt resistor between your inputs as seen in this cookbook:

Split-Tap Connection for Line-to-Line Isolated Voltage Measurement Using AMC3330

This protects against a voltage surge. We would also emphasize to verify that the input current is less than ±10 mA specified in the absolute maximum ratings table of the datasheet.

Please let me know if you have more questions.

Best regards,

Eva

+1 Ethan Ku 11 months ago in reply to Eva Mason

Prodigy 80 points

Hi Eva

thnak you for supporting

i will study it and let you know , if i have a problem

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AMC1301: the PIN4(GND1) of AMC1301 connection problem