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FREQ 데이터시트(PDF) 27 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) 27 Page - fujitsu semiconductor

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MB39A214A
Limitation : development tool vendor use only
FUJITSU SEMICONDUCTOR CONFIDENTIAL
DS405-00007-1v0-E
Minimum power supply voltage
The maximum on duty is limited by "the minimum off time (tOFFMIN) that an IC holds without fail as a fixed
value" and "the on time (tON) determined by the power voltage value and the output voltage setting value".
The ratio between the output voltage and the power voltage must be less than the maximum on duty.
The minimum power supply voltage that is required to sustain the output voltage can be calculated by the
following formula.
(VOUT + IOUT_MAX
(RDC + RON_Main))
VOUT
VIN_MIN =
VOUT − (VOUT + IOUT_MAX
(RDC + RON_Sync))
tOFF_MIN
fOSC 1.2
VIN_MIN
: Power supply voltage [V]
VOUT
: Output setting voltage [V]
IOUT_MAX : Maximum load current value [A]
RON_Main : ON resistance of high-side FET [Ω]
RON_Sync : ON resistance of low-side FET [Ω]
RDC
: Series resistance of inductor [Ω]
fOSC
: Switching frequency setting value [Hz]
tOFF_MIN
: Minimum off time (Maximum value) [s]
(For the minimum off time, see “ON/OFF Time [Minimum OFF time ] ” in
“ ELECTRICAL CHARACTERISTICS”.)
Use the smaller switching frequency setting in order to make the voltage output possible with the lower
power voltage.
Slope voltages
It is necessary to sustain the Slope voltage 15 mV or higher in order to obtain the stable switching cycle.
The Slope voltage can be calculated by the following formula.
(VIN − VOUT)
VOUT
RON_Sync
VSlope =
L
VIN
fOSC
VSlope
: Slope voltage [V]
VIN
: Power supply voltage [V]
VOUT
: Output setting voltage [V]
fOSC
: Switching frequency [Hz]
RON_Sync : ON resistance of low-side FET [Ω]
L
: Inductor value [H]



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