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LM5155: positive to negative application inquire

Part Number: LM5155

Tool/software:

Hi Sir,

we know that LM5155 can design SEPIC topology, but if need to add positive to negative circuit, is it possible? or is there any reference design data for us to refer to? thanks for you help and learn from you.

we specification as below:

Vin 15v~35v,

vout1= 25v/1A

vout2= 5v/ 600mA

Vout3= - 5v/ 20mA