TPS55340 ISOLATED FLYBACK

Hello Eli,

From the wording of your question, the answer would be don't use it! Connect your 24V supply to your output that requires 24V.  You won't get a current boost from the power supply by using the device.

So rephrase your question and provide as much detail as possible.  I suspect you meant 24V in and 5V at 5A out?

Thanks,

Hi 

The request is :

Vin=24

Vout=isolated 24V

Iout=5A 

As I understand from you this EVM and the TPS55340, can not be used for this application?

You just forgot to mention the isolation part.  For Isolated Continuous Conduction Mode Flyback Using theTPS55340 SLVA9559.pdf

That app note is the same as the EVM.  I will have to look through the EVM guide and schematic to see if you can get 24V out with 24V in.  Just off the top of my head I would say changing the feedback input should do it as long as the transformer is rated for up to 5A.  I will have to check.

Thanks,

This design is for 5V output .I have this design/EVM (TPS55340EVM-148

What needed to used this EVM to 24V output?

Hi eli,

A controller such as the TPS40210 will be needed for this application. The 40V switch and 5A peak current limit will be too little. The output voltage of 24V is also reflected back to the primary. Assuming 1:1 transformer this would put 48V on the internal switch which already exceeds the absolute maximum and leaves no margin for overshoot and ringing.

Best Regards,
Anthony

Hi Anthony

So bottom line, this current EVM can not be modified  for 24V output,and the TPS55340 can not be used for such application,

Am I correct?

Eli

That is right. The TPS55340 barely supports 24V to 5V in a flyback due to the voltage rating.

Thanks.

Can it be used for 3A instead of 5A ?

No, the voltage rating is not sufficient.