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query related to TPS92210

Piyush Pandey
Prodigy 20 points
Other Parts Discussed in Thread: TPS92210

Hello Guys

Actually this is my first post in this forum SO sorry if I put my query in wrong section.

Actually my quewry is that I was studying the datasheet of the TPS92210 and there on the page 19 I was studying the operation of the LED controller in the Low power Mode .

There it is written that : 

The FB current regulates the output voltage in the Low Power Mode with hysteretic bursts of pulses using FB current thresholds.

So I want to know what is the meaning of this hysteretic bursts of pulses , I am not getting the point between this particular term.

I am waiting for the help of you people.

Thank you

  • 0
    TI__Genius 15910 points

    Welcome to the Forum!  I am hoping you visit often and find it most helpful. 

    "Hysteretic bursts of pulses" can be described as follows:

    when the load on the TPS92210 converter decreases so that the FB pin is sinking approximately 250uA or more, the controller will go into low power mode.  In this mode, the peak primary current will be reduced to 33% of its programmed maximum value, the Vgate signal will pulse the driver with pulses that are 30kHz apart but in packets of pulses... at no-load these 30kHz pulses may be just a few and spaced tens of Hz apart, as the load increases, the packet has more pulses, still 30kHz apart but these added pulses start "filling in the gap" between the packets so now there are more pulses in the packet and they are getting closer together.  As more power is demanded, the number of  pulses per packet grows until the gaps between these 30kHz packets is filled in and at the point when the TPS92210 transitions out of low power mode, the pulses are a continuous 30kHz...


    Enclosed is a picture of hysteretic bursts of pulses for a visual example

    Doc2.docx
  • 0 in reply to Lisa Dinwoodie
    Prodigy 20 points

    Thank you Mam for such a beautiful explanation about my query I am very much happy with you reply and the doc file which you posted to your reply.

    Thank you once again.

    and yes I am a regular viewer and visitor of the TI forum.

    Piyush Pandey