參數(shù)資料
型號： LM2574HVADJMWC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC
封裝： WAFER
文件頁數(shù)： 26/33頁
文件大?。?/td> 814K
代理商： LM2574HVADJMWC
National P/N LM2574HV - SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
LM2574HVN-ADJ
8
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1K+ $2.0500
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LM2574HVN
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LM2574HV-5 MDC
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LM2574HV-5
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General Description
The LM2574 series of regulators are monolithic integrated circuits that provide all the active functions for a
step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation.
These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include
internal frequency compensation and a fixed-frequency oscillator.
The LM2574 series offers a high-efficiency replacement for popular three-terminal linear regulators. Because
of its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking
needed.
A standard series of inductors optimized for use with the LM2574 are available from several different
manufacturers. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and
output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 A
(typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal
shutdown for full protection under fault conditions.
Features
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3.3V, 5V, 12V, 15V, and adjustable output versions
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Adjustable version output voltage range, 1.23V to 37V (57V for HV version) ±4% max over line and
load conditions
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Guaranteed 0.5A output current
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Wide input voltage range, 40V, up to 60V for HV version
q
Requires only 4 external components
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52 kHz fixed frequency internal oscillator
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TTL shutdown capability, low power standby mode
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High efficiency
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Uses readily available standard inductors
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Thermal shutdown and current limit protection
Applications
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Simple high-efficiency step-down (buck) regulator
q
Efficient pre-regulator for linear regulators
q
On-card switching regulators
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Positive to negative converter (Buck-Boost)
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LM2574HV.html (3 of 4) [Aug-09-2002 1:59:13 PM]
相關(guān)PDF資料
PDF描述
LM2574HVN-3.3/NOPB 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8
LM2574-5.0MWC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC
LM2574-ADJMWC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC
LM2574N-15/NOPB 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8
LM2574M-15/NOPB 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO14
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2574HVM-12 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
LM2574HVM-12/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
LM2574HVM-12/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter IC
LM2574HVM-15 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
LM2574HVM-15/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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