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Buck Converter: Current Monitoring (output, peak, ripple)

Lee Carstensen
Prodigy 150 points

Hello everyone,

I am using a F28068M LaunchPad as my controller connected to CCS and my converter is the DPS Booster Pack, provided by TI. I got through the basic tutorial (OUT of Box Demo) but I want to display/monitor the current. Specifically I would like to measure/monitor/display the peak current, ripple, and output current. 

How do I go about that?
I have tried to graph the Gui_IL1 variable, but it gives me really wild, uncontrolled random noise signals?
Is there documentation that explains how to use the graph tool in CCS?

thank you

  • 0
    TI__Genius 10820 points

    Hello Lee,

    Gui_IL1 is the (heavily) filtered version of the inductor current. At very low loads (or with default load when active load is disabled) this variable may not provide accurate current information. If you increase the output load by setting 'Active_LD1_EN' to 1 and 'Continuous_ON' to 1, this value should closely match the average inductor current. Please note that the inductor current and all other variables are sampled once in a PWM switching cycle. This, in addition to the fact that the feedback current is heavily filtered, means that users will not be able to reliably look at and measure the ripple current and the peak current. It is best to use an oscilloscope for these measurements.

    I hope this helps.

    Hrishi