參數(shù)資料
型號(hào)： LM2591HVT-5.0
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
中文描述： 3 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, PZFM5
封裝： TO-220, 5 PIN
文件頁(yè)數(shù)： 15/20頁(yè)
文件大小： 730K
代理商： LM2591HVT-5.0
Application Information
(Continued)
UNDERVOLTAGE LOCKOUT
Some applications require the regulator to remain off until
the input voltage reaches a predetermined voltage. An und-
ervoltage lockout feature applied to a buck regulator is
shown in
Figure 8
, while
Figure 9
and
Figure 10
applies the
same feature to an inverting circuit. The circuit in
Figure 9
features a constant threshold voltage for turn on and turn off
(zener voltage plus approximately one volt). If hysteresis is
needed, the circuit in
Figure 10
has a turn ON voltage which
is different than the turn OFF voltage. The amount of hyster-
esis is approximately equal to the value of the output volt-
age. If zener voltages greater than 25V are used, an addi-
tional 47 k
resistor is needed from the ON /OFF pin to the
ground pin to stay within the 25V maximum limit of the ON
/OFF pin.
10129336
FIGURE 7. Delayed Startup
10129337
FIGURE 8. Undervoltage Lockout for Buck Regulator
L
www.national.com
15
相關(guān)PDF資料
PDF描述
LM2591HVS-3.3 SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
LM2591HVS-ADJ SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
LM2591HVT-ADJ SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
LM2591HVT-3.3 SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
LM2591HVS-5.0 SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2591HVT-ADJ 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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
LM2591HVT-ADJ 制造商:Texas Instruments 功能描述:SWITCHING REG 1A ADJ 2591 TO2205
LM2591HVT-ADJ/LF16 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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
LM2591HVT-ADJ/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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
LM2592HVS-3.3 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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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