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FREQ 데이터시트(PDF) 32 Page - fujitsu semiconductor

부품명 FREQ
상세설명  2ch DC/DC converter IC with PFM/ PWM synchronous rectification
PDF  56 Pages
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제조업체  FUJITSU [fujitsu semiconductor]
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Logo FUJITSU - fujitsu semiconductor

FREQ 데이터시트(HTML) 32 Page - fujitsu semiconductor

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MB39A214A
Limitation : development tool vendor use only
FUJITSU SEMICONDUCTOR CONFIDENTIAL
DS405-00007-1v0-E
2. Selecting parts
Selection of smoothing inductor
The inductor value selects the value that the ripple current peak-to-peak value of the inductor is 50% or less
of the maximum load current as a rough standard. Calculate the inductor value in this case by the following
formula.
VIN −VOUT
VOUT
L ≥
LOR
IOUT_MAX
VIN fOSC
L
: Inductor value [H]
IOUT_MAX
: Maximum load current [A]
LOR
: Ripple current peak-to-peak value of inductor/Maximum load current ratio (= 0.5)
VIN
: Power supply voltage [V]
VOUT
: Output setting voltage [V]
fOSC
: Switching frequency [Hz]
It is necessary to calculate the maximum current value that flows to the inductor to judge whether the
electric current that flows to the inductor is a rated value or less. Calculate the maximum current value of
the inductor by the following formula.
ΔIL
ILMAX ≥ IOUT_MAX +
2
ILMAX
: Maximum current value of inductor [A]
IOUT_MAX : Maximum load current [A]
ΔIL
: Ripple current peak-to-peak value of inductor [A]
L
: Inductor value [H]
VIN
: Power supply voltage [V]
VOUT
: Output setting voltage [V]
fOSC
: Switching frequency [Hz]
IOUT_MAX
ILMAX
0
Inductor current
Time
ΔIL



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