Can a 1206 size resistor be used for the Quick-start circuit (resistor R9) in a Low-Line CY8CLEDAC02 and CY8CLEDAC03 design?

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    Question: Can a 1206 size resistor be used for the Quick-start circuit (resistor R9) in a Low-Line CY8CLEDAC02 and CY8CLEDAC03 design?

     

    Answer:

    Question: Can a 1206 size resistor be used for the Quick-start circuit (resistor R9) in a Low-Line CY8CLEDAC02 and CY8CLEDAC03 design?

      A 1206 resistor is not recommended for the momentary power dissipation for R9 during quick-start. A 1210 resistor is the minimum package size recommended. The attached file works though the equations showing a 1210 resistor is the minimum size for a typical quick-start circuit.

    Attachment: Low-Line High-PF R9 power.doc