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TPS560430: Limited current , measured value vs calculated value

Hisao Uchikoshi
Genius 14870 points
Part Number: TPS560430

Hi Experts,

We are measuring the limited current for TPS560430X3FDBR. 

When input voltage is below 5V, the measured limited current is larger than calculated value.

When input voltage is above 5V, the measured limited current is smaller than calculated value.

We use below quotation when calculate the limited current.

Could you please provide the information why the measured value is larger than calculated value at Vin < 5V?

Regards,

Uchikoshi 

  • 0
    TI__Mastermind 22301 points

    Uchikoshi,

    Is the output voltage the same for those two conditions?

    And are you measuring inductor current or output current?

    this device uses peak/valley limiting, peak current limit is triggered faster with higher VIN, and the lowside MOSFET is turned on quicker in high VIN cases.

    With lower VIN it takes longer to reach peak current and the result is a higher average output current and that's why I think you see the different output current for different VIN.

    If you can I would place a current loop on the inductor (VOUT side) and monitor inductor current to see that inductor peak current limit is the same in both cases.

    Hope this helps,

    -Orlando