TPS51363 Negative power supply output

Xiao Zhu2

Other Parts Discussed in Thread: TPS51363, TPS40055

Hello Team

We want to design a DCDC converter. The demand is 12v input , -5v voltage and 8A output. We plan use TPS51363. i am not sure if the device can do it. Could you help double check it and give us some advise? Thank you.

over 8 years ago

0 JohnTucker over 8 years ago

TI__Guru**** 191445 points

You have to de-rate the current by a factor of 1-D for inverting buck boost topology. I don't believe you can get 8 A output at 12 v to -5 V conversion.

0 Xiao Zhu2 over 8 years ago in reply to JohnTucker

TI__Expert 3215 points

Could you recommend a devices which meet the requirement? Thank you.

0 JohnTucker over 8 years ago in reply to Xiao Zhu2

TI__Guru**** 191445 points

I would look at TPS40055.

0 Yuchang Zhang over 8 years ago in reply to JohnTucker

TI__Mastermind 18510 points

Agree with Tucker, and first, 51363 Max output is just 2V, and also we tried to change 51363 EVM from buck to buck-boost inverter, it can work, we set it 1.35Vout, and test switch node, when add heavy loading, there is double pulse happen. looks the loop is already not stable.

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TPS51363 Negative power supply output