DocID031629 Rev 1

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PM8804

Layout guidelines

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6.4

Component placement



Place the PM8804 and all the related components close to each other; use both sides



Place all the feedback components close to each other, use both sides



Place the sense resistors close to the power MOSFET, if possible on the same side



Place the input ceramic capacitors close to the input side of power transformer, if

possible on the same side



Place the primary snubber network close to the power transformer, on the bottom side



Place the rectifier diode or MOSFET close to the output side of the transformer, if

possible on the same side



Place the secondary snubber network close to the rectifier diode or MOSFET, bottom

side



Place the decoupling capacitors for VC close to the PM8804 pin 1



Place the components for FSW, DT and SS pins in a quiet area, separated as much as

possible from the other signals



Use interconnections of at least 20 mils for the following PM8804 pins: GAT1, GAT2,

VC.