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LT1871 Sepic+Choke +/- 30V/3A circuit

I wanna use LT1871(or other Sepic control IC) to give a pair of +30V/3A & -30V/3A simultaneously.

The following is my simulation circuit, but I can only have +30V/2A & -30V/2A at most.

Vin=9~15V, switch freq must be 300kHz, how can I do to have +30V/3A & -30V/3A simultaneously? Thanks.

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