LM5155: positive to negative application inquire

Tommy Tzeng

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

4 months ago

0 Mounika Girish 4 months ago

TI__Intellectual 2426 points

Hi Tommy,

Thank you for using e2e forum.

Please check this reference design in SEPIC using LM5155 with for negative output. Let me know if you have any further questions.

Best regards,

Mounika

0 Tommy Tzeng 4 months ago in reply to Mounika Girish

Genius 5790 points

Hi Mounika,

thanks for you reply, may we know whether LM5155 can achieve multi-output base on SEPIC topology? or need use a flyback topology?

Vin 15v~35v,

vout1= 25v/1A

vout2= 5v/ 600mA

Vout3= - 5v/ 20mA

+1 Mounika Girish 4 months ago in reply to Tommy Tzeng

TI__Intellectual 2426 points

Hi Tommy,

Extremely sorry that I forgot to attach the reference design number - https://www.ti.com/tool/PMP40488. It is possible with SEPIC please refer to this attached ref design - 6W dual -output SEPIC converter reference design.

For outputs more than two, flyback can also be used.

Best regards,

Mounika

Power management

Power management forum

LM5155: positive to negative application inquire