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FREQ Datasheet(PDF) 39 Page - fujitsu semiconductor

Part # FREQ
Description  2ch DC/DC converter IC with PFM/ PWM synchronous rectification
PDF  56 Pages
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Manufacturer  FUJITSU [fujitsu semiconductor]
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Logo FUJITSU - fujitsu semiconductor

FREQ Datasheet(HTML) 39 Page - fujitsu semiconductor

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39
MB39A214A
Limitation : development tool vendor use only
FUJITSU SEMICONDUCTOR CONFIDENTIAL
DS405-00007-1v0-E
Calculate each rating of the output capacitor by the following formula:
VCOUT > VOUT
VCOUT : Withstand voltage of the output capacitor [V]
VOUT
: Output voltage [V]
ΔIL
IRMS ≥
2
3
IRMS : Allowable ripple current of output capacitor (effective value) [A]
ΔIL
: Ripple current peak-to-peak value of inductor [A]
When connecting resistance in series configuration while a ceramic capacitor is in use, the resistor rating is
calculated by the following formula.
ESR
ΔIL2
PESR >
12
PESR
: Power dissipation of resistor [W]
ESR
: Resistor value [Ω]
ΔIL
: Ripple current peak-to-peak value of inductor [A]



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