UCC28910: Pls suggestion UCC28910 used Flayback converter multiple output

prarinya Maneechompoo

Intellectual 540 points

Part Number: UCC28910

Dear ALL

Pls help to suggestion customer used in Flyback converter multiple output the UCC28910 can used yes or not .

Flyback multiple output

If can used UCC28910 for flyback multiple output Pls suggestion to me How to calculate Rs2 and Nps ?

Thank you so much & Best regard

Prarinya

over 6 years ago

0 Eric Faraci over 6 years ago

TI__Expert 8210 points

Prarinya

We recommend that you verify that the power level of your design does not exceed the maximum power requirements. The maximum power depends on what the input voltage range is and the amount of cooling that is available. For example, with an input from 175 VAC to 265 VAC is 6.5W closed case or 9.5W open frame.

We recommend that they follow design techniques described in this video to help with the transformer design https://training.ti.com/multiple-output-flybacks-how-improve-cross-regulation?context%5B0%5D=1134585&context%5B1%5D=1139235&context%5B2%5D=1134623

To calculate Rs2 and Nps you can use our excel calculator http://www.ti.com/lit/zip/sluc503. Pick the highest power output rail and use that as the output winding to base the Nps design from.

Best Regards,

Eric

0 prarinya Maneechompoo over 6 years ago in reply to Eric Faraci

Intellectual 540 points

Dear Eric

Thank you so much for suugestion to me . .

The output power 1.888 W application is open frame .

The output current is below

Secondary

12V -> 100mA

6V -> 15uA

Primary (Auxiliary)

20V -> 5.6mA

12V -> 48mA

6V -> 20uA

The excel file design tool is single output i can used +12V/100mA to calculate Nps yes or not ?

Thank you so much & best regard

Prarinya

0 Eric Faraci over 6 years ago in reply to prarinya Maneechompoo

TI__Expert 8210 points

Prarinya

UCC28910 will work at that power level. Yes you can use the +12V/100mA output for the excel calculator.

Please note that the regulation accuracy on each output will be limited since you have so many. It is recommended that you add some kind of regulation on the output, such as an LDO, to make sure that each rail stays within regulation.

Best Regards,

Eric

Power management

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UCC28910: Pls suggestion UCC28910 used Flayback converter multiple output