Application note DI-124 400V

Hi Edouard,

Thank you for choosing Power Integrations.

My suggestion is for you to use PIExpert and design the transformer as you would any regular design. Just disregard any warning message related to the maximum drain voltage since you will be using the StackFET configuration. You may refer to the link I am attaching bellow for the StackFET description and operation.

https://ac-dc.power.com/design-support/circuit-ideas/high-voltage-input-switching-power-supply-using-stackfet/

Hello,

I have 2 questions:

1) In DI-124 (Ultrawide Input Range (57 – 580 VAC) Flyback Power Supply), I would like to have Multiple output like 20V-1A, 12v-1A, 5v 500ma (Max 20W). with interdependent voltage source (no common ground) Any suggestion ?

2) In PI Expert, Vacmax is limited to 300v. How can I design for high voltage like 580v ? Because If I design for lower voltage in PI-Expert and add StackFET may the transformer design will be wrong as it is done for 300v.. isn't it ?

Thanks in Advance
Balaji R

Hi Balaji,

Thank you for choosing Power Integrations.

1) For the output power that you would be working with, I suggest that you use Tinyswitch-4. You can make use of PIexpert for this. Once you get into the schematic page, under the specifications section choose stacking and select floating output type.

2) You can make use of PIxls for inputs greater that 300V. You have more control when it comes to parameters with PIxls. Just ignore wany warnings pertaining to the maximum drain voltage since you will be using StackFET.