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FAN5307MP18X 데이터시트(PDF) 8 Page - Fairchild Semiconductor

부품명 FAN5307MP18X
상세설명  High-Efficiency Step-Down DC-DC Converter
Download  13 Pages
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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FAN5307 Rev. 1.0.4
N-channel rectifier switch. The device stays in sleep
mode until the output voltage falls below the low thresh-
old. The FAN5307 enters the PWM mode as soon as the
output voltage can no longer be regulated in PFM with
constant peak current.
100% Duty Cycle Operation
As the input voltage approaches the output voltage and
the duty cycle exceeds the typical 95%, the converter
turns the P-channel transistor continuously on. In this
mode the output voltage is equal to the input voltage
minus the voltage drop across the P-channel transistor:
VOUT = VIN – ILOAD × (RdsON + RL), where
RdsON = P-channel switch ON resistance
ILOAD = Output current
RL = Inductor DC resistance
Soft Start
The FAN5307 has an internal soft-start circuit that limits
the inrush current during start-up. This prevents possible
voltage drops of the input voltage and eliminates the out-
put voltage overshoot. The soft-start is implemented as a
digital circuit increasing the switch current in four steps to
the P-channel current limit (520mA). Typical start-up time
for a 10µF output capacitor and a load current of 200mA
is 500µs.
Short-Circuit Protection
The switch peak current is limited cycle by cycle to a typ-
ical value of 520mA. In the event of a output voltage
short circuit the device operates at minimum duty cycle,
therefore the average input current is typically 100mA.


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