MB39C308 Datasheet, PDF (30/60 Pages) Fujitsu Component Limited. – 6ch DC/DC Converter IC for LPIA Platform VR

MB39C308
■ APPLICATION NOTE
• Inductor Selection
See the “■RECOMMENDED OPERATING CONDITIONS” for the recommended inductance. Furthermore, to
confirm whether the current flowing through the inductor is within the rated value, the maximum value of the
current flowing through the inductor needs to be found. The maximum current flowing through the inductor can
be found from the following formula.
ΔIL
ILMAX ≥ IoMAX +
2
ΔIL =
VDD − VO
L
VO
×
VDD × fOSC
ILMAX : Maximum current through inductor [A]
IoMAX : Maximum load current [A]
ΔIL : Inductor ripple current peak-to-peak value [A]
VDD : Switching power supply voltage [V]
VO : Output setting voltage [V]
fOSC : Switching frequency [Hz]
Inductor current
ILMAX
IoMAX
0
ΔIL
Time
30
DS04-27261-6E