|
AP6015_09 Datasheet, PDF (14/18 Pages) Diodes Incorporated – High Efficiency Step-Down Low Power DC-DC Converter | |||
|
◁ |
AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Application Information (Continued)
 Inductor Selection
In order to avoid saturation of the inductor, the inductor should be rated at least for the maximum output
current plus the inductor ripple current which is calculated as:
1 â ( VO )
ÎI L = VO Ã
VCC
LÃ f
I L(MAX )
=
I O(MAX )
+
ÎI L
2
Where:
f= Switching frequency (1MHz typical)
L = Inductor value
â³IL = Peak-to-peak inductor ripple current
IL(max) = Maximum inductor current
Vcc=3.6V Vout=2.5V f=1MHz L=3.3uH
Ãâ³ILâ230mA
Vcc=3.6V Vout=2.5V f=1MHz L=1.8uH
Ãâ³ILâ360mA
AP6015 Rev. 3
14 of 18
www.diodes.com
FEBRUARY 2009
© Diodes Incorporated
|
▷ |