LM5023: Cross regulation : Multioutput Config 2 switch flyback vs 1 switch (standard)

rajat devagiri

Part Number: LM5023
Other Parts Discussed in Thread: PMP41031

Tool/software:

I was trying to design a multioutput flyback with Vin range : 100V to 700VDC and Vout : 18V, 5V, Pout : 65W (combined).

Is there a good reference material available to evaluate the cross regulation aspects of 2 switch vs 1 switch flybacks. I am presuming, the 2 switch flyback would be better as the Vclamp is limited to Vin. I have ordered the PMP41031 design from TI.

But if there are any suggestion/ materials for 2 switch flyback topology for multioutput versions which talk about cross regulation, that will really help.

2 months ago

0 Mike O' 2 months ago

TI__Guru* 85806 points

Do to high volume this will be look into in the order it was recieved.

0 Mike O' 2 months ago in reply to Mike O'

TI__Guru* 85806 points

Hello,

On the cross regulation of flyback converters all of the outputs are coupled through the transformer turns ratio. The cross regulation for a 2 switch flyback or multi switch flyback will be similar. If done correctly you should be able to get regulation within +/- 10%.

I found this application note that give tips on improving cross regulation on flyback converters that will give you design tips on how to improve the cross regulation on multi output flyback converters.

https://www.ti.com/lit/an/snva562/snva562.pdf

Regards,

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LM5023: Cross regulation : Multioutput Config 2 switch flyback vs 1 switch (standard)