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TIDM-1001: Burst mode for interleaved LLC DC/DC

Wayne Huang
Genius 14365 points
Part Number: TIDM-1001

Champs,

I am asking this for our customers.

We refer to our TIDM-1001 and use similar control mechanism for interleaved LLC by one-shot global reload.

Now, we would like to add burst mode for low loads.

That is, to enable PWM for some time and then disable it for some time, alternatively.

We hope all the PWM can be enabled together (followed by master PWM counter 0) and then be disabled together (followed by master PWM PRD (up count)).

I think we have several methods to implement these, like by tripping, action qualifier, etc.

One easier method we think about is,

1. Use one-shot global reload AQCSFRC to continuous disable and enable PWM.

2. Use one-shot DBCTL to disable and enable deadtime control.

3. Enable one-shot global reload just like other CAU, CBU,...

Do you think it makes sense?

Or do you have any suggestion for us?

Wayne

  • 0
    TI__Genius 10820 points

    Hi Wayne,

    The options you have mentioned cover most of the possibilities. Here's an easy way of figuring out the best option to select based on your system requirements.

    If all PWMs are in phase with each other or, for a multi-phase system, if you want each phase to be turned OFF and turned ON at the end of its own switching cycle then use a method that uses shadow loading of registers. On type-4 PWMs you could use one-shot and global reload feature to do this along with shadow registers. Shadow registers used could be AQ (control, s/w force), DB (RED, FED, control), CMPA/B or a combination of these.

    If you want PWMs to be disabled all at once, you may use a trip, pwm sync or global load s/w force. 

    There are other variations and combinations possible depending on what is required by the application.

    I hope this helps.

    Hrishi

  • 0 in reply to Hrishi Nene
    TI__Genius 14365 points
    Hrishi,

    I see.
    Thank you.

    Wayne