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UCD3138 LLCHBFirmware-1.2 Light load operation design

user5316778
Intellectual 340 points
Other Parts Discussed in Thread: UCD3138

For UCD3138 LLCHBFirmware-1.2

The PWM mode is used in light load operation because of mechanism for automatic mode switching.

If I want to increase the efficiency in light load, how can I use the burst mode?

What kind of setting do I design and consider (switching frequency, burst frequency, on time and rest time)?

  • +1
    TI__Genius 14580 points

    Hello,

    You can use the below two registers to switch on or off DPWMs.

    LoopMuxRegs.LLENTHRESH.bit.TURN_ON_THRESH 
    LoopMuxRegs.LLDISTHRESH.bit.TURN_OFF_THRESH 

    Also,  LoopMuxRegs.LLCTRL.bit.LL_EN =1;

    Thanks,

    Sean

  • +1 in reply to Sean Xu
    Intellectual 340 points

    How can I set

    LoopMuxRegs.LLENTHRESH.bit.CYCLE_CNT_THRESH

    LoopMuxRegs.LLENTHRESH.bit.TURN_ON_THRESH

    LoopMuxRegs.LLDISTHRESH.bit.TURN_OFF_THRESH

    Can you give example to set?

    Such as switching frequency is 100kHz, 5 pulse, rest time is 100us.

  • +1 in reply to user5316778
    TI__Genius 14580 points

    Hi, 

    UCD3138 doesn't support to configure the number of pulses, and reset time during burst mode.  You can use default value for LoopMuxRegs.LLENTHRESH.bit.CYCLE_CNT_THRESH. TURN_ON_THRESH/TURN_OFF_THRESH configure the threshold of DPWM turning-on (250ns/LSB) or turning-off threshold (250ns/LSB). You can find more details from program manual.

    Thanks,

    Sean