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TPS92515-Q1: Inductor current and PWM pin

Wendy Wang1
Genius 17080 points
Part Number: TPS92515-Q1
Other Parts Discussed in Thread: TPS92515

Hi,

In TPS92515, the inductor current is controlled by the IL-PEAK(ton), Roff and Coff(toff). So, the inductor current has no relationship with the PWM pin. Is my understanding correct?

  • 0
    TI__Expert 3640 points

    Hello Wenxiu,

    The PWM signal enables or disables the buck switching, so the inductor current is turned on or off by PWM.

    When PWM goes high, switching is enabled immediately, and then the inductor current will rise from 0 (assuming it was off long enough) and ramp up until the set peak is reached, following which it will do the off time (set by Roff Coff) and on time and so forth. When PWM goes low, switching stops and inductor current falls to zero at the rate of Vled/L where Vled itself is also falling due to the LED load having no current.

    Hope this answers the question.

    Regards,

    Sumeet