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参数资料
| 型号： | LM2576-12MDC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | DIE |
| 文件页数： | 19/27页 |
| 文件大小： | 741K |
| 代理商： | LM2576-12MDC |
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National P/N LM2576 - SIMPLE SWITCHER 3A Step-Down Voltage Regulator
The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a
step-down (buck) switching regulator, capable of driving 3A 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 LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It
substantially reduces the size of the heat sink, and in some cases no heat sink is required.
A standard series of inductors optimized for use with the LM2576 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 3A output current
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Wide input voltage range, 40V up to 60V for HV version
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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
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P+ Product Enhancement tested
Applications
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Simple high-efficiency step-down (buck) regulator
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Efficient pre-regulator for linear regulators
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On-card switching regulators
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Positive to negative converter (Buck-Boost)
Design Tools
Title
Size in Kbytes Date
View Online Download
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SimpleSwitcher DC-DC
Converters Design Software
10 Kbytes
12-Jun-
2002
If you have trouble printing or viewing PDF file(s), see Printing Problems.
Application Notes
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LM2576.html (4 of 5) [Aug-09-2002 2:05:44 PM]
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2576-12WT | 功能描述:直流/直流开关调节器 3A Step-Down SMPS Regulator (ROHS Compliant) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2576-12WU | 功能描述:直流/直流开关调节器 3A Step-Down SMPS Regulator (ROHS Compliant) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2576-12WU TR | 功能描述:直流/直流开关调节器 3A Step-Down SMPS Regulator (ROHS Compliant) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2576-15 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Easy Switcher 3.0A Step-Down Voltage Regulator |
| LM2576-15BT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller |
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