Flyback power supply support required

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Dear sir,
i want to design power supply from 3 Watt to 60 Watt, enclosed box with resin potting, PCB mount

i want to supply to our customer with 3 years warranty.

what is the design technique/component selection for a long life quality product.

Ravi kumar,

Hello rksoft2005,

Would like to ask for more details. What is the end of application of the power supply? what is the input voltage? Do you have a specific topology or Power Integrations IC in mind?