參數(shù)資料
型號(hào)： LM2574-12MDC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC
封裝： DIE
文件頁(yè)數(shù)： 1/33頁(yè)
文件大?。?/td> 814K
代理商： LM2574-12MDC
LM2574/LM2574HV
SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
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 out-
put voltage within specified input voltages and output load
conditions, and ±10% on the oscillator frequency. External
shutdown is included, featuring 50 A (typical) standby cur-
rent. The output switch includes cycle-by-cycle current limit-
ing, as well as thermal shutdown for full protection under
fault conditions.
Features
n 3.3V, 5V, 12V, 15V, and adjustable output versions
n Adjustable version output voltage range, 1.23V to 37V
(57V for HV version) ±4% max over line and load
conditions
n Guaranteed 0.5A output current
n Wide input voltage range, 40V, up to 60V for HV version
n Requires only 4 external components
n 52 kHz fixed frequency internal oscillator
n TTL shutdown capability, low power standby mode
n High efficiency
n Uses readily available standard inductors
n Thermal shutdown and current limit protection
Applications
n Simple high-efficiency step-down (buck) regulator
n Efficient pre-regulator for linear regulators
n On-card switching regulators
n Positive to negative converter (Buck-Boost)
Typical Application (Fixed Output Voltage Versions)
Patent Pending
SIMPLE SWITCHER is a trademark of National Semiconductor Corporation
DS011394-1
Note: Pin numbers are for 8-pin DIP package.
June 1999
LM2574/LM2574HV
SIMPLE
SWITCHER
0.5A
Step-Down
V
oltage
Regulator
1999 National Semiconductor Corporation
DS011394
www.national.com
相關(guān)PDF資料
PDF描述
LM2574-5.0MDC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC
LM2574-3.3MDC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC
LM2574N-5 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8
LM2574DW-ADJ 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO16
LM2574N-ADJ 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2574-12YN 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 0.5A Step-Down SMPS Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
LM2574-15 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGULATOR
LM2574-15BN 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Voltage-Mode SMPS Controller
LM2574-15BWM 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Voltage-Mode SMPS Controller
LM2574-3.3 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGULATOR
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