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Light load efficiency

Aradhyasambhu Satpathy
Intellectual 540 points
Other Parts Discussed in Thread: TPS63805

Hi all,

During light load condition, the DC-DC converter are operated in

1. Pulse skipping mode

2. Burst mode.

Of these both mode of operation, which one is more effective and why?

  • 0
    TI__Expert 7925 points

    Hi Aradhyasambhu,

    Normally, these are two different names for the same mode of operation. The device operates in short bursts, between the bursts it skips PWM pulses. Do you have a particular device on your mind?

    Best regards,
    Milos

  • 0 in reply to Milos
    Intellectual 540 points

    HI Milos,

    Thanks for the reply. Can you please suggest in which controller they go for both burst mode and pulse skipping method to enhance the light load performance of the DC - DC converter?

  • 0 in reply to Aradhyasambhu Satpathy
    TI__Expert 7925 points

    Hi Aradhyasambhu,

    Do you have specific operating conditions or application in mind, or this is just a general question? If it is a general question, take for example the TPS63805, and check section 9.4.2 of the datasheet. At light loads, the device switches in bursts where it skips the switching cycles depending on the output state of the skip comparator. So you can say it operates in burst mode, or skip mode, or what we call it in this case generically, power-save mode. The names can be different, but they usually refer to the same principle of operation. 

    Best regards,
    Milos