Flybacksmps

Hi,

If your application requires only high line input (195 - 265V), you should specify accordingly when using PIExpert and you will find that it can optimize the design easily.

PIExpert makes a number of assumptions when doing a design which often can lead to failure to optimize for designs that can operate the part at its limits. There are ways to get around that by changing a number of assumptions that PIExpert makes however that often requires some expertise in the use of the tool. If you are trying to design for universal input, the load level is starting to approach the maximum limits of the part and it will be best for you to use the tool PIXLs which automatically installs on your computer when you install PIExpert. Use of this tool is described in a step by step manner in our application notes so you should have little difficulty in using the tool.

Please review the application note to help you with your design. I am providing a link below for your reference:

http://www.powerint.com/sites/default/files/product-docs/an43.pdf

Note that at this high a power level in order to meet other regulatory requirements (if applicable) a PFC will be required as the front end, in which case you should design this as a DC-Dc converter with DC input same as the PFC output voltage. For most universal input applications PFC output voltage is typically 380V to 385V. We make a product family of integrated PFC controllers and you can review additional information using the link below:

http://www.powerint.com/en/products/hiper-family/hiperpfs

At this high a power level, the Flyback may not be the most optimal topology. Winding construction of the transformer will be critical and snubber will be fairly lossy requiring careful design.

The other optimal topologies at this power level are the two switch forward and the LLC topologies. I am providing links below for your reference. Note that both these products require that your design is a high line only design or uses a regulated boost PFC stage at input.

http://www.powerint.com/en/products/hiper-family/hipertfs

http://www.powerint.com/en/products/hiper-family/hiperlcs

Note that on each of our product pages on our web site, we provide links to application notes and reference designs.

Regards

PI-Sarek

Hi
Thanks for the reply. My application needs universal input 85-265V AC and out put is 24V DC @ 10A. The device list doesn't have TOp262En/YN for the tool to select it while creating a design.

Hi,

Please ensure that you have the latest version of PIXLs available.

I just verified the available selection of the devices in the tool.

Note that in the Y package TOP261Y is the biggest device.Please refer to the datasheet of the part.

I verified PIXLs and both TOP261Y and TOP262E are available for selection.

Regards

PI-Sarek

Hi
I have downloaded PiExpert 8.5 which doesn't contain TOP 261Y/262Y and may I request you to send the PIXL latest version to my email to go ahead with the design.

Hi,

Please refer to my earlier reply. TOP261Y is the biggest part in the Y package. TOP262Y does not exist. TOP262 is available only in the E-package or the L-Package.

When you download and install "PIEepert" on your computer, PIXLs is installed automatically. In windows, go to the start menu, select "Programs", select "Power Integrations", "PI Expert suite 8.5" and select program "PIXLs Designer"

Normally you should see a shortcut for this program on your desktop as well.

When you open PIXLs Designer, select "File", followed by "New", select product line as "TOPSwitch" and select family as "TOPSwitch-HX Flyback" and clock on "OK"

Line 17 allows you to select whatever device you like from the family. On guidelines for using the PIXLs Designer, please refer to the TOPSWitch HX Application note AN-43.

http://www.powerint.com/sites/default/files/product-docs/an43.pdf

Regards

PI-Sarek