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| 型号： | LM2575WT |
| 厂商： | Micrel Inc |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A TO220-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 37 V |
| 输入电压： | 4 V ~ 40 V |
| 频率 - 开关： | 42kHz ~ 63kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-5 |
LM2575
52kHz Simple 1A Buck Regulator
General Description
The LM2575 series of monolithic integrated circuits
provide all the active functions for a step-down (buck)
switching regulator. Fixed versions are available with a
3.3V, 5V, 12V, fixed output. Adjustable versions have an
output voltage range from 1.23V to 37V. Both versions are
capable of driving a 1A load with excellent line and load
regulation.
These regulators are simple to use because they require a
minimum number of external components and include
internal frequency compensation and a fixed-frequency
oscillator.
The LM2575 series offers a high efficiency replacement for
popular three-terminal adjustable linear regulators. It
substantially reduces the size of the heat sink, and in
many cases no heat sink is required.
A standard series of inductors available from several
different manufacturers are ideal for use with the LM2575
series. This feature greatly simplifies the design of switch-
mode power supplies.
The feedback voltage is guaranteed to ±2% tolerance for
adjustable versions, and the output voltage is guaranteed
to ±3% for fixed versions, within specified input voltages
and output load conditions. The oscillator frequency is
guaranteed to ±10%. External shutdown is included,
featuring less than 200μA standby current. The output
switch includes cycle-by-cycle current limiting and thermal
shutdown for full protection under fault conditions.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
? 3.3V, 5V, 12V, and adjustable output versions
? Voltage over specified line and load conditions:
– Fixed version: ±3% max. output voltage
– Adjustable version: ±2% max. feedback voltage
? Guaranteed 1A output current
? Wide input voltage range
– 4V to 40V
? Wide output voltage range
– 1.23V to 37V
? Requires only 4 external components
? 52kHz fixed frequency internal oscillator
? Low power standby mode IQ typically <200μA
? 80% efficiency (adjustable version typically >80%)
? Uses readily available standard inductors
? Thermal shutdown and current limit protection
? 100% electrical thermal limit burn-in
Applications
? Simple high-efficiency step-down (buck) regulator
? Efficient pre-regulator for linear regulators
? On-card switching regulators
? Positive to negative converter (inverting Buck-Boost)
? Isolated flyback converter using minimum number of
external components
? Negative boost converter
___________________________________________________________________________________________________________
Typical Applications
1
1
7V–40V
Unregulated
DC Input
+V IN
4 Feedback
LM2575-5.0 Output L1
+5V, 1A
Regulated
Output
7V–40V
Unregulated
DC Input
+V IN
LM2575
4 Feedback
Output L1
+5V, 1A
Regulated
Output
+
C IN
100μF
3 5
Gnd On/Off
2
330μH
D1
1N5822
+
C OUT
330μF
+
C IN
100μF
3 5
Gnd On/Off
2
330μH
D1
1N5822
+
C OUT
330μF
R2 3.09k
R1 1k
Note: Pin numbers are for TO-220 Package
Fixed Regulation in Typical Application
Note: Pin numbers are for TO-220 Package
R1
V OUT = 1.23 ( 1 + R2 )
Adjustable Regulation in Fixed Output Application
Micrel Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
May 2009
1
M9999-051209-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2575WU | 功能描述:直流/直流开关调节器 1A 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 |
| LM2575WU TR | 功能描述:直流/直流开关调节器 1A 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 |
| LM2575WUI05 | 制造商:Micrel 功能描述:Micrel LM2575WUI05 |
| LM2575YN | 功能描述:直流/直流开关调节器 1A Step-Down SMPS Regulator (Lead Free) 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 |
| LM2575YWM | 功能描述:直流/直流开关调节器 1A Step-Down SMPS Regulator 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 |
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