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TPS63070: TPS63070 Positive and Negative current limit clarification

CHRIS TURNER
Prodigy 25 points
Part Number: TPS63070

I need a clarification regarding the "Average, positive input current limit" spec and the "Average, negative input current limit" of the TPS63070.  

My interpretation is that positive input current limit is it is the maximum input current limit for the device (the normal peak current limit you would see in a typical power supply IC datasheet).

However, the "Average, negative input current limit" defines the maximum inductor current ripple the IC will tolerate (positive limit - negative limit).  

Is this correct?

Best Regards,

Chris Turner

  • 0
    TI__Expert 8420 points
    "Average, positive input current limit" is not the peak current. As the name tells it, it is the average current. For instance when the TPS63070 is operating in boost mode, the "Average, positive input current limit" is the maximum average current that can flow through the inductor
    "Average, negative input current limit" does not define the inductor current ripple. This converter has this specification to precise how negative current is limited.

    I would recommend to read the "Control loop description" p.10 of the datasheet to understand why the average current is specified. This is basically due to the average current mode control topology used in this converter.

    What is the end application of your project?
    What are your operating conditions?