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TPS51116: Can TPS51116 be applied to asynchronous buck?

Charlie Xiao
Expert 6170 points
Part Number: TPS51116

Hi BU team,

Can TPS51116 be applied as asynchronous buck? I mean use a diode instead of M2 in the picture below. Thanks.

Regards,

Charlie

  • +1
    TI__Genius 10772 points

    Hi Charlie,

    I would recommend that the customer try this in simulation first with regards to their specifications, using the PSpice or TINA models found here under the 'Design & development' section, and then under the 'Design tools & simulation' section. For the power diode, the rated reverse voltage must be at least 2V higher than the maximum voltage at the switch node. The forward voltage drop of the diode should be small in order to achieve higher efficiency, and the peak current rating must be greater than the maximum output current plus one-half the peak-to-peak inductor current. 

    Some things to consider: In the datasheet found here, on page 17 and 18, DRVH and DRVL both provide feedback which might be affected by this change since you would be disconnecting DRVL from M2 and from the diode you would be placing there, which might also create additional noise. Another thing is making changes to this might affect LL which is the current sense comparator input for RDS current sense. This is why I would recommend that the customer try this in simulation first with regards to their specifications, using the PSpice or TINA models referenced earlier, and go off the data that is driven from those results.

    Thanks,
    Field