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An IC which supplies 15V/-15V at 1A for each rail

Nero Tuo
Prodigy 10 points
Other Parts Discussed in Thread: TPS65131

Hi~

I need an IC, which  supplies 15V/-15V at 1A for each rail. The input voltage is from 3.3V to16V.

I have taken a look of TPS65131, and I wonder whether it can take a  continuing 1A current for each rail or not.

Or there is another IC can support this case?

PS: My english is a little poor, wishing you can understand my words XD.

Thanks!

  • 0
    TI__Genius 9085 points

    Nero, 

    I appreciate your detailed question.

    The input rang of this device is limited to  2.7-V to 5.5V, so it may not work for your 16V input case.

    I assume that the 1A continuing current is fine, since this device is rated for a minimum of 1.8A, but I have tried to loop in a support person for this device to confirm.

     

  • 0
    TI__Guru 65470 points

    Hello Nero,

    For a converter that generates +/-15V at 1A  from 3.3V to 16V, you need a part that is able to handle a switch current of roughly 5A for 3.3V input on the boost converter and even a higher current for -15V.

    The reason for the high current is that the output energy is the input energy with some losses, therefore if the output voltage is 5 times as high as the input voltage, the input current has to become 5 times as high as the output current to support this energy.

    Could you please give a little more insight in your application that we can find a solution for your issue? Where is your input voltage coming from? Is there a possibility to reduce the input voltage variation in your system somehow?

    The more information you can give about the application, the easier it gets to find a fitting solution.

    Best regards,
    Brigitte