12 or 48V dual input current balance solution

Andy_Lin

Intellectual 2650 points

Other Parts Discussed in Thread: UCC39002, UCC29002

Hi Team,

As title , my customer is surveying the solution as subject for server system application , the spec as below

There are two 12 or 48V adapters provide power into system, and customer want to balance these two adapters loading.

Adapter 1: 280W, 12 or 48Vout ±5%
Adapter 2: 280W, 12 or 48Vout ±5%
System: 450W, 48Vin or 12Vin

customer original used LTC4370 in as previous project's solution , the previous system adapter is 12Vin,

for the new project in needed to support 450W in total , and the Vin might be 48V,

Please kindly help to suggest the solution if we have any, 12V or 48Vin are both ok, thanks!

over 5 years ago

0 Peter Meaney over 5 years ago

TI__Mastermind 31580 points

Hi Andy,

The TI load share controller, UCC39002, is a different type of controller to the LTC4370.

The UCC39002 needs access to the remote sense pins of the output voltage to actively trim the output voltage of Unit A and B to ensure load sharing.

Please review the datasheet and see if this is likely to meet the application requirement.

Regards

Peter

0 Jan Bob over 5 years ago in reply to Peter Meaney

Intellectual 280 points

Dear Peter,

UCC39002 looks good, but can it be used for 48V Vin?

Its ADJ pin seem have to link to S+ directly?

Best regards,
Bob Jan

0 Peter Meaney over 5 years ago in reply to Jan Bob

TI__Mastermind 31580 points

Hi Bob,

I have attached a summary of how the UCC29002 can be used. I slide 8 you can see how the UCC29002 can be used with a higher output voltage. Note the use of resistive dividers will increase the tolerance so the current sharing may have more imbalance.

Regards

PeterUCC29002 summary.pdf

0 Peter Meaney over 5 years ago in reply to Peter Meaney

TI__Mastermind 31580 points

Hi Bob,

Since it has been nearly a week since my last response I am assuming your are happy with my reply and I will close this post.

If not please open a new post if you have more questions.

Regards

Peter

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12 or 48V dual input current balance solution