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How to sync multiple switcher

Jacques St-Pierre
Prodigy 140 points

Hello,

I need to build a multiple output power supply for an audio application. The power requirement are not big, less than 200ma for each output will suffice, one single input of 8 to 15 vdc. The device will run on battery, so the power should be as efficient as possible. The outputs will have to be 5, 3.3, 2.5 and 1.8Vdc. I think to use simple switcher, but bad experience in the past make me think twice. Using multiple switchers cause interference beat between the switch frequencies that appear in the audio signal. So I tought to use the sync pin to run them on a single clock source. Do you think that this will prevent interference beat between them all? Any sugestion will be welcome.

Bye

Jacques

 

 

  • 0
    TI__Mastermind 19911 points

    Hi Jacques, 

    Apologies for the late response. Yes, synchronization will help. You should choose switchers that accept external sync signal. I would encourage you to use our online design tool WEBENCH (Link). Once you enter the design requirements, the tool will start calculating solutions and you will see a panel like this:

    If you check the Ext Sync box, the tool would suggest only solutions that fit the input and output voltage requirements AND also have the feature to be synchronized to external clock. 

    I hope this helps.

    Regards, 

    Denislav