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TNY-switch 288 SMPS Design - Fusible Resistor Calculation

Posted by: Nikhil Shah on

Hello Folks!

I'm designing a TNY288 based SMPS. My transformer input inductance is 931uH. I'm using 320V MOV and have a doubt about Fusible Resistor calculation. Output Load is 12W. Input capacitor is 22uH 450V. (ckt flow -> input - fusible resistor - MOV - CM choke 22mH - bridge - 22uF450V cap - transformer)

Can anyone help me out regarding what Ohm/Watt value will be my WireWound flame proof resistor? 

Please also give design equations. 

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