TL497A: Boost/SEPIC converter

Hello, 

Thanks for reaching out. In this case, we might suggest a dual output flyback with the LM5157 for example or a dual output SEPIC. Let us know if further support is needed. 

Kind regards,
EM 

Hi Em,

Thanks! Noticed that is only single channel LM5157. Is there a device that has 2 output so that the customer wont have to use two LM5157 in their design?

Hi EM,

Update: the output requirements is 500mA for +18V out and 500 mA for -18V out. Both output should provide 9W and the total power output of the IC shall be 18W. Do we have anything that can satisfy this?

Thank you kindly.

Regards,

Marvin

Hello, 

The customer can use the LM5157 in flyback configuration, there is a flyback EVM with 4 outputs available on the product folder ( https://www.ti.com/tool/LM5157EVM-FLY ), the schematic is at page 13 of the user's guide (https://www.ti.com/lit/ug/snvu770/snvu770.pdf ). Please keep in mind that in a flyback one of the outputs can easily be set to a negative voltage, even if the EVM is only showing in this case positive outputs. Another example could be this reference design with the LM5155 (a very similar device but with external switch) where a SEPIC with symmetric output is designed: https://www.ti.com/tool/PMP40488 

Let us know if you have further questions. 

Kind regards,
EM