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参数资料
| 型号： | LM2575BUT&R |
| 厂商： | MICREL INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封装： | TO-263, 5 PIN |
| 文件页数： | 1/12页 |
| 文件大小： | 152K |
| 代理商： | LM2575BUT&R |
LM2575
52kHz Simple 1A Buck Regulator
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
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 200A 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 <200A
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
7V–40V
Unregulated
DC Input
LM2575-5.0
+
CIN
100F
+VIN
1
3
Gnd
5
On/Off
2
Output
4
Feedback
L1
330H
+
D1
1N5822
COUT
330F
+5V, 1A
Regulated
Output
Note: Pin numbers are for TO-220 Package
R2
R1
7V–40V
Unregulated
DC Input
LM2575
+
CIN
100F
+VIN
1
3
Gnd
5
On/Off
2
Output
4
Feedback
L1
330H
+
D1
1N5822
COUT
330F
R2 3.09k
R1 1k
VOUT = 1.23 1 +
()
+5V, 1A
Regulated
Output
Note: Pin numbers are for TO-220 Package
Fixed Regulation in Typical Application
Adjustable Regulation in Fixed Output Application
相关PDF资料 |
PDF描述 |
|---|---|
| LM2575-5.0BUT&R | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| LM2575-3.3WUTR | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| LM2575WUTR | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| LM2575-12BUT&R | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| LM2575D2T-12G | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2575BWM | 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 |
| LM2575BWM TR | 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 |
| LM2575D2T-005 | 功能描述:直流/直流开关调节器 5V 1A Buck PWM 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 |
| LM2575D2T-012 | 功能描述:直流/直流开关调节器 12V 1A Buck PWM 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 |
| LM2575D2T-012G | 功能描述:直流/直流开关调节器 12V 1A Buck PWM 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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