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參數(shù)資料
| 型號： | LM5007MMEP |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 231K |
| 代理商： | LM5007MMEP |
High Voltage Bias Regulator (Continued)
Over-Voltage Comparator
The over-voltage comparator is provided to protect the out-
put from overvoltage conditions due to sudden input line
voltage changes or output loading changes. The over-
voltage comparator monitors the FB pin versus an internal
2.875V reference (OV_REF). If the voltage at FB rises above
OV_REF the comparator immediately terminates the buck
switch on time pulse.
On Time Generator and Shutdown
The on time of the LM5007EP is set inversely proportional to
the input voltage by an external resistor connected between
R
ON and Vin. The RON terminal is a low impedance input
biased at approximately 1.5V. Thus the current through the
resistor and into the R
ON terminal is approximately propor-
tional to Vin and used internally to control the on timer. This
scheme of input voltage feed-forward hysteretic operation
achieves nearly constant operational frequency over varying
line and load conditions. The on time equation for the
LM5007EP is :
Ton=1.42x10
-10 xR
ON /VIN
The R
ON pin of the LM5007EP also provides a shutdown
function which disables the regulator and significantly de-
creases quiescent power dissipation. By pulling the R
ON pin
to below 0.7V logic threshold activates the low power shut-
down mode. The V
IN quiescent current in the shutdown
mode is approximately 100A internal to the LM5007EP plus
the current in the R
ON resistor.
20093906
FIGURE 2. Self Biased Configuration
LM5007EP
Enhanced
Plastic
www.national.com
7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM5007MMX | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM5007MMX/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM5007MMXNOPB | 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 9V to 75V 8-Pin MSOP T/R |
| LM5007SD | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM5007SD/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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