How to calibration fomula of CT for STPM34 ?

[Gz]

Hi All;

I would like to calculate CT. I have formula below.

   I factor = VREF  / (AI * CALIB_I * DPOW * KSI * KINT )
 
VREF = 1.18 from datasheet
AI = 16 from datasheet
CALIB_i = 0.875 from datasheet
DPOW = removed
KSI = Rshut = 0.05 ohm when I calcurate from voltage Input vary 0.3V to -0.3V.
I adject 0.3V/5A = 0.06 ohm
KINT = 1 from datasheet
 
my I factor = 1.18 / ( 16 * 0.875 * 0.05 * 1 ) = 1,6857
 
 nvmLeg_t metroDefault = {
  {                 // config
    0x00000068
  },
  {                 // data1[19] STPM (Config for CT)
    0x040000a0,
    0x240000a0,
    0x000004e0,
    0x00000000,
    0x003ff800,
    0x003ff800,
    0x003ff800,
    0x003ff800,
    0x00000fff,
    0x00000fff,
    0x00000fff,
    0x00000fff,
    0x03270327,
    0x03270327,
    0x00000000,
    0x00000000,
    0x00000000,
    0x00000000,
    0x00004007,
  },
  {                // powerFact[2]
		  30154605,// ,      // ch 1         112,0028
		  19600493 // ch 2      //(1,18 *1,18 * (1+ (810000/470)) / (2 * 16 * 0.05  * 0,875 * 0,875) =  1960,04937
  },
  {                // voltageFact[2]
    116274,        // ch 1
    116274        // ch 2
  },
  {                // currentFact[2]
    //25934,         // ch 1
		  25934,//,
		  16857   // ch 2    //1.18  / (16 * 0,875 * 0.05 * 1)   = 1,6857
  }
};

When I use to CT rating 60A/5A. It's available but I use CT rating 100A/5A. I's not available. Who can help me and advice me ?

Thank you.

Best regards.

[Eleon BORLINI]

Hi Panupong, I suggest you to submit your question to this community section: https://community.st.com/s/topic/0TO0X000000BSqZWAW/power-management-and-motor-control

because the product is more related to this family. Regards

[Gz]

Hi eleon.borlini;

I would like to delete this post. Now I post this question in power-management and motor control.

Thank you.

Best regards.