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LM2576T-12

更新时间： 2024-11-21 11:34:07
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描述
regulators are monolithic integrated circuits that provide all the active functions for a step-down switching

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LM2576T-12 数据手册

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TIGER ELECTRONIC CO.,LTD  
LM2576 Series  
Description  
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 versions. 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 50µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as  
thermal shutdown for full protection under fault conditions.  
Note: The LM2576HV is not produced yet.  
Applications  
Features  
•
•
•
•
Simple high-efficiency step-down (buck) regulator  
•
•
•
3.3V, 5V, 12V, 15V, and adjustable output versions  
Efficient pre-regulator for linear regulators  
On-card switching regulators  
Positive to negative converter (Buck-Boost)  
Adjustable version output voltage range  
1.23V to 37V (57V for HV version) ± 4% max over line  
and load conditions  
•
•
Guaranteed 3A output current  
Wide input voltage range, 40V up to 60V for HV  
version  
•
•
•
•
•
•
Requires only 4 external components  
52 kHz fixed frequency oscillator  
TTL shutdown capability, low power standby mode  
High efficiency  
Uses readily available standard inductors  
Thermal shutdown and current limit protection  
Typical application Figure 1.(Fixed Output Voltage Versions)  
LM2576/  
LM2576HV-  
5.0  
FEEDBACK  
7V - 40V  
(60V for HV)  
UNREGULATED  
DC INPUT  
+VIN  
1
4
L1  
OUTPUT  
+5V  
2
REGULATED  
OUTPUT  
3A  
100  
H
5
ON/OFF  
+
GND  
3
C
OUT  
+
D1  
1000  
C
IN  
TIGER ELECTRONICS CO.,LTD  
1
12345678

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