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Original question:

TMDSHVMTRPFCKIT: Rectifier output voltage.

TMDSHVMTRPFCKIT: Overcurrent threshold

UserHomeInit
Expert 2205 points
Part Number: TMDSHVMTRPFCKIT


Dear TI Hello,

I want to set the overcurrent protection for my application,

In the HVMotorCtrl+PFC-SCH[R1.1], TI use  two configurations to set the value of the Overcurrent threshold,

For which current value correspond 3V3? 

How I could adjust  the protection for my system?

Thanks in advance,

Regards,

S.Tarik,

  • 0
    TI__Genius 17175 points
    3.3 = offset + gain*(Rshunt * I) = 1.65 + 8.25(0.02 * I); 1.65/(8.25*0.02) = 10A. You have a +/-10A range for 0-3.3V swing across the shunt resistor

    You don't want to change the current sense circuitry, so you can change the overcurrent threshold. The over current voltage threshold is set to (22/23)*3.3 = 0.143V-3.157V when you use position 1 of J7; otherwise, you can use the potentiometer VR1 to tune the threshold.

    Sean