ISL97631
PCB Layout Considerations
The layout is very important for the converter to function
properly. R SET must be located as close as possible to the FB
and GND pins. Longer traces to the LEDs are OK. Similarly,
the supply decoupling cap and the output filter cap should be
as close as possible to the V IN and V OUT pins.
The heat of the IC is mainly dissipated through the GND pin.
Maximizing the copper area connected to this pin is
preferable. In addition, a solid ground plane is always helpful
for the EMI performance.
The demo board is a good example of layout based on the
principle. Please refer to the ISL97631 Application Brief for
the layout.
7
FN7370.1
December 21, 2005
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