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TMCS1126: Error, Field Refection and Current Range Questions in Promotion

Part Number: TMCS1126

Tool/software:

Hi Team,

Currently, I promoted TMCS1126 to customer meet below 3 questions, looking forward to your professional answer, thanks in advance:

• How we defined or calculate the total error? (TMCS1126 is 1.5% on the first page of datasheet)
• Do we have field refection reference design or materials can share to customer?
• 20kW Inverter. 1-~20kHz
• PCB will be sent by email
• For a AC current, in order to get the sampling value within range, the current range should match the peak value or the RMS value of our Hall? Whether the peak value is a thermal parameter?

BRs,

Francis

• Hello Francis,

Here are my responses to your questions:

How we defined or calculate the total error? (TMCS1126 is 1.5% on the first page of datasheet)

The datasheet for this has been updated a recently, and here is now 1.45%, and is a little more clear about where the number comes from:

So, this means that the maximum lifetime sensitivity error including thermal drift and lifetime drift would be 0.45% + 50ppm(125°C-25°C) + 0.5% = 1.45%

Do we have field refection reference design or materials can share to customer?
• 20kW Inverter. 1-~20kHz
• PCB will be sent by email

The TMCS1126 already has built in ambient field rejection, so we do not have additional materials on this, although additional rejection can be added.

For a AC current, in order to get the sampling value within range, the current range should match the peak value or the RMS value of our Hall? Whether the peak value is a thermal parameter?

For the sensor to be in range, the value should match the peak value, however the thermal parameters are based on the RMS value (when the frequency is higher than 1 Hz).

Regards,

Mitch

• Got it, very clear. Thanks a lot.

• You're welcome!