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參數資料
| 型號： | FAN5307SX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | High-Efficiency Step-Down DC-DC Converter |
| 中文描述： | 0.7 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | ROHS COMPLIANT, MO-178AA, SOT-23, 5 PIN |
| 文件頁數： | 8/12頁 |
| 文件大小： | 633K |
| 代理商： | FAN5307SX |
PRODUCT SPECIFICATION
FAN5307
8
REV. 1.0.2 6/22/04
PFM mode gives additional headroom for the voltage drop
during a load transient from light to full load. The voltage
overshoot during this load transient is also minimized due to
active regulation during turning on the N-channel rectifier
switch. The device stays in sleep mode until the output
voltage falls below the low threshold. 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:
V
OUT
= V
IN
– I
LOAD
×
(R
ds
ON
+ R
L
), where
R
ds
ON
= P-channel switch ON resistance
I
LOAD
= Output current
R
L
= 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 output 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 out-
put capacitor and a load current of 200mA is 500μs.
Short-Circuit Protection
The switch peak current is limited cycle by cycle to a typical
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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相關代理商/技術參數 |
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|---|---|
| FAN5308 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:800mA High-Efficiency Step-Down DC-DC Converter |
| FAN5308_07 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:800mA High-Efficiency Step-Down DC-DC Converter |
| FAN5308MPX | 功能描述:直流/直流開關轉換器 SYSTEM_POWER RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| FAN5308MPX | 制造商:Fairchild Semiconductor Corporation 功能描述:IC DC/DC CONVERTER ((NW)) 制造商:Fairchild Semiconductor Corporation 功能描述:IC, STEP-DOWN DC/DC CONVERTER, MLP-6 |
| FAN5309M_ABB3086B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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