CS2 datasheet(26/56 Pages) FUJITSU

tên linh kiện	CS2

Giải thích chi tiết về linh kiện	2ch DC/DC converter IC with PFM/ PWM synchronous rectification

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nhà sản xuất	FUJITSU [fujitsu semiconductor]

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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 =

(0.6946 + 0.2667

ΔIL (1−

tOFF

)

RON_Sync) +

VIN − VOUT

VOUT

(VIN − VOUTx)

ΔVOUTx = ESR ΔIL, ΔIL =

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]

: Inductor value [H]

fOSC

: Switching frequency [Hz]

VOUTx

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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