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LM2575/D

更新时间： 2024-11-08 23:46:43
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其他 - ETC 稳压器
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28页 248K
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Easy Switcher? 1.0 A Step-Down Voltage Regulator

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LM2575/D 数据手册

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LM2575  
Easy Switcher 1.0 A  
Step-Down Voltage  
Regulator  
The LM2575 series of regulators are monolithic integrated circuits  
ideally suited for easy and convenient design of a step–down  
switching regulator (buck converter). All circuits of this series are  
capable of driving a 1.0 A load with excellent line and load regulation.  
These devices are available in fixed output voltages of 3.3 V, 5.0 V,  
12 V, 15 V, and an adjustable output version.  
These regulators were designed to minimize the number of external  
components to simplify the power supply design. Standard series of  
inductors optimized for use with the LM2575 are offered by several  
different inductor manufacturers.  
http://onsemi.com  
TO–220  
TV SUFFIX  
CASE 314B  
1
5
Heatsink surface connected to Pin 3  
Since the LM2575 converter is a switch–mode power supply, its  
efficiency is significantly higher in comparison with popular  
three–terminal linear regulators, especially with higher input voltages.  
In many cases, the power dissipated by the LM2575 regulator is so  
low, that no heatsink is required or its size could be reduced  
dramatically.  
TO–220  
T SUFFIX  
CASE 314D  
1
The LM2575 features include a guaranteed ±4% tolerance on output  
voltage within specified input voltages and output load conditions, and  
±10% on the oscillator frequency (±2% over 0°C to 125°C). External  
shutdown is included, featuring 80 µA typical standby current. The  
output switch includes cycle–by–cycle current limiting, as well as  
thermal shutdown for full protection under fault conditions.  
5
Pin 1.  
V
in  
2. Output  
3. Ground  
4. Feedback  
5. ON/OFF  
Features  
• 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions  
• Adjustable Version Output Voltage Range of 1.23 V to 37 V ±4%  
Maximum Over Line and Load Conditions  
2
D PAK  
D2T SUFFIX  
CASE 936A  
1
• Guaranteed 1.0 A Output Current  
5
• Wide Input Voltage Range: 4.75 V to 40 V  
• Requires Only 4 External Components  
• 52 kHz Fixed Frequency Internal Oscillator  
• TTL Shutdown Capability, Low Power Standby Mode  
• High Efficiency  
Heatsink surface (shown as terminal 6 in  
case outline drawing) is connected to Pin 3  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 24 of this data sheet.  
• Uses Readily Available Standard Inductors  
• Thermal Shutdown and Current Limit Protection  
• Moisture Sensitivity Level (MSL) Equals 1  
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page 24 of this data sheet.  
Applications  
• Simple and High–Efficiency Step–Down (Buck) Regulators  
• Efficient Pre–Regulator for Linear Regulators  
• On–Card Switching Regulators  
• Positive to Negative Converters (Buck–Boost)  
• Negative Step–Up Converters  
• Power Supply for Battery Chargers  
Semiconductor Components Industries, LLC, 2001  
1
Publication Order Number:  
February, 2001 – Rev. 3  
LM2575/D  
1234567...28

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