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INDUCTOR SELECTION
The AW3643 is designed to use a 0.47µH or 1µH inductor. When the device is boosting (V
OUT
> V
IN
) the
inductor is typically the largest area of efficiency loss in the circuit. Therefore, choosing an inductor with the
lowest possible series resistance is important. Additionally, the saturation rating of the inductor should be
greater than the maximum operating peak current of the AW3643. This prevents excess efficiency loss that
can occur with inductors that operate in saturation. For proper inductor operation and circuit performance,
ensure that the inductor saturation and the peak current limit setting of the AW3643 are greater than I
PEAK
in
the following calculation:
L
IN
OUTLED
PEAK
I
V
VI
I
where
OUTSW
INOUTIN
L
VLf
VVV
I
2
And
=2 or 4MHz.
Table 2 lists various inductors and their manufacturers that work well with the AW3643.
Table 2 Recommended Inductors
