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CS2 Datasheet(PDF) 26 Page - fujitsu semiconductor

No. de pieza CS2
Descripción Electrónicos  2ch DC/DC converter IC with PFM/ PWM synchronous rectification
PDF  56 Pages
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Fabricante Electrónico  FUJITSU [fujitsu semiconductor]
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CS2 Datasheet(HTML) 26 Page - fujitsu semiconductor

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26
MB39A214A
Limitation : development tool vendor use only
FUJITSU SEMICONDUCTOR CONFIDENTIAL
DS405-00007-1v0-E
APPLICATION NOTE
1. Setting Operating Conditions
Setting output voltages
The output voltage can be set by adjusting the setting output voltage resistor ratio. Setting output voltage is
calculated by the following formula.
R1 + R2
2.8 10-7
ΔVOUTx
VOUTx =
R2
(0.6946 + 0.2667
ΔIL (1−
tOFF
)
RON_Sync) +
2
VIN − VOUT
VOUT
(VIN − VOUTx)
ΔVOUTx = ESR ΔIL, ΔIL =
L
VIN
fOSC
, tOFF =
VIN fOSC
VOUTx
: Output setting voltage [V]
VIN
: Power supply voltage [V]
ΔVOUTX : Output ripple voltage value [V]
tOFF
: Off time [s]
RON_Sync
: ON resistance of low-side FET [Ω]
ΔIL
: Ripple current peak-to-peak value of inductor [A]
ESR
: Series resistance element of output capacitor [Ω]
L
: Inductor value [H]
fOSC
: Switching frequency [Hz]
R1
VOUTx
R2
VOUTX
FBX
The total resistor value (R1+R2) of the setting output resistor should be selected up to 100 kΩ.
x: Each channel number



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