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LM2575BUT&R

更新时间： 2024-11-05 13:09:19
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器
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12页 153K
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LM2575BUT&R 数据手册

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LM2575  
52kHz Simple 1A Buck Regulator  
General Description  
Features  
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.  
• 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  
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.  
–
• Requires only 4 external components  
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.  
• 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  
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.  
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  
Data sheets and support documentation can be found on  
Micrel’s web site at www.micrel.com.  
• Negative boost converter  
___________________________________________________________________________________________________________  
Typical Applications  
7V–40V  
Unregulated  
DC Input  
7V–40V  
Unregulated  
DC Input  
+5V, 1A  
Regulated  
Output  
+5V, 1A  
Regulated  
Output  
4
4
Feedback  
L1  
Feedback  
L1  
1
1
LM2575  
LM2575-5.0  
Output  
2
Output  
2
+VIN  
+VIN  
330µH  
D1  
330µH  
D1  
+
+
R2 3.09k  
R1 1k  
+
+
3
5
3
5
C
C
IN  
IN  
Gnd On/Off  
Gnd On/Off  
COUT  
330µF  
COUT  
330µF  
100µF  
100µF  
1N5822  
1N5822  
Note: Pin numbers are for TO-220 Package  
Note: Pin numbers are for TO-220 Package  
R2  
VOUT = 1.23 1 +  
( )  
R1  
Fixed Regulation in Typical Application  
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  
M9999-051209-B  
May 2009  
1
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