AW3643

Jan 2018 V1.4

www.awinic.com.cn

32

Copyright © 2016 SHANGHAI AWINIC TECHNOLOGY CO., LTD

INDUCTOR SELECTION

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,

the following calculation:

L

IN

OUT

LED

PEAK

I

V

V

I

I













where





OUT

SW

IN

OUT

IN

L

V

L

f

V

V

V

I















2

And

SW

f

=2 or 4MHz.

Table 2 lists various inductors and their manufacturers that work well with the AW3643.

Table 2

Recommended Inductors

MANUFACTURER

L

PART NO.

SIZE

TOKO

1μH

DFE201610P-1R0M

2.0 mm x 1.6 mm x 1.0 mm

3.7A

58mΩ

TOKO

0.47μH

DFE201610P-R470M

2.0 mm x 1.6 mm x 1.0 mm

4.1A

32mΩ

Sunlord

1

μH

WPN252012H1R0MT

2.5mm × 2.0mm ×1.2mm

3.4A

48

mΩ