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TPS40322: Current balanceing issue

Part Number: TPS40322

Hi Experts,

Sorry for selecting  wrong part number,the correct part number is TPS40322! 

We encountered two phase non-balance isse at start-up, The one of phase  would damaged caused by non-balance phenomenon

The one would operate BOOST,the other one would operate BUCK ,pls see the figure as below.

Please give us some suggestions ,thanks.