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TMCS1133: VOUT Pin Clamp while measuring +60APk

Dhanush Acharya
Prodigy 10 points
Part Number: TMCS1133

Tool/software:

Hi Team,

We are using the TMCS1133A1A (PMCS1133A1AQDVGR) in DC-DC Converter, with a measuring range of -90A peak to +90A peak.
During evaluation, the VOUT pin clamped to 3.71V for a 60A peak current. Test is done with 5.4k Load resistor as well as Open circuit at VOUT Pin. Results for both are same. Whereas it is giving correct output for -60A Peak current.

Here we are sharing test observations:

DSO Image:

Current sensor Input (Blue Color), Current Sensor Output (Yellow Color)

1. For +60APk Current Sensor Input

2. For -60APk Current Sensor Input

Kindly provide your suggestions.

  • 0
    TI__Expert 8045 points

    Hello,

    The voltage output levels look normal for the most part (there is not sensitivity error) so the problem is output clipping. What is the voltage of the supply pin Vs? Could you verify that the supply voltage does not drop during operation by taking an oscilloscope measurement of the Vs and gnd pins?

    Thanks,

    Levi DeVries

  • 0 in reply to Levi DV
    Prodigy 10 points

    Hi,

    The 5V supply voltage drops during operation. After resolving this, issue has been solved. Could you please suggest recommended series resistor for the 5V supply voltage pins (Pin no. 9 and 10).

    Thanks,

    Dhanush Acharya

  • 0 in reply to Dhanush Acharya
    TI__Expert 8045 points

    Hello Dhanush,

    We don't recommend series resistors on the power supply input, the only circuitry we recommend on the power supply in all cases is the bypass capacitor on the input: 

    Let me know if you have any more questions,

    Levi DeVries