Datasheet > LM2576BM

LM2576BM

更新时间： 2024-01-16 00:09:51

品牌	Logo	应用领域
TGS		稳压器
页数	文件大小	规格书
9页	416K
描述
3A Step-Down Voltage Regulator

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LM2576BM 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	TO-263,	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
Factory Lead Time：	7 weeks	风险等级：	1.58
其他特性：	ALSO OPERATES IN ADJUSTABLE MODE FROM 1.23V TO 37V	模拟集成电路 - 其他类型：	SWITCHING REGULATOR
最大输入电压：	40 V	最小输入电压：	4 V
标称输入电压：	12 V	JESD-30 代码：	R-PSSO-G5
JESD-609代码：	e3	长度：	10.287 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	5	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出电流：	7.5 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	TO-263
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	245	认证状态：	Not Qualified
座面最大高度：	4.59 mm	表面贴装：	YES
切换器配置：	BUCK	最大切换频率：	63 kHz
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn) - annealed
端子形式：	GULL WING	端子节距：	1.7 mm
端子位置：	SINGLE	处于峰值回流温度下的最长时间：	40
宽度：	9.144 mm	Base Number Matches：	1

LM2576BM 数据手册

LM2576BM

temperatures up to 70°C, a current rating of 75% of the DC load current would be a good

choice for a conservative design. The capacitor voltage rating must be at least 1.25 times

greater than the maximum input voltage, and often a much higher voltage capacitor is

needed to satisfy the RMS current requirements.

OUTPUT CAPACITOR C_OUT

An output capacitor is required to filter the output and provide regulator loop stability. Low

impedance or low ESR Electrolytic or solid tantalum capacitors designed for switching

regulator applications must be used. When selecting an output capacitor, the important

capacitor parameters are; the 100 kHz Equivalent Series resistance (ESR), the RMS ripples

current rating, voltage rating, and capacitance value. For the output capacitor, the ESR

value is the most important parameter. The output capacitor requires an ESR value that has

an upper and lower limit. For low output ripple voltage, a low ESR value is needed. This

value is determined by the maximum allow able output ripple voltage, typically 1% to 2% of

the output voltage. But if the selected capacitor’s ESR is extremely low, there is a

possibility of an unstable feedback loop, resulting in an oscillation at the output.

CATCH DIODE D1

Buck regulators require a diode to provide a return path for the inductor current

when the switch turns off. This must be a fast diode and must be located close to the

LM2576BM using short leads and short printed circuit traces. Because of their very fast

switching speed and low forward voltage drop, Schottky diodes provide the best

performance, especially in low output voltage applications (5V and lower). Ultra fast

recovery, or High-Efficiency rectifiers are also a good choice, but some types with an

abrupt turnoff characteristic may cause instability or EMI problems.

INDUCTOR SELECTION L

All switching regulators have two basic modes of operation; continuous and discontinuous.

The difference between the two types relates to the inductor current, whether it is flowing

continuously, or if it drops to zero for a period of time in the normal switching cycle. Each

mode has distinctively different operating characteristics, which can affect the regulators

performance and requirements. Most switcher designs will operate in the discontinuous

mode when the load current is low.

The LM2576BM (or any of the Simple Switcher family) can be used for both continuous and

discontinuous modes of operation. There is a formula for general applications:

(Note The unit of voltage is V, the unit of current is A)

7/9

1...4 5 678 9

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LM2576BT	MICREL	52kHz Simple 3A Buck Voltage Regulator	获取价格
LM2576BT-LB03	MICROCHIP	3.5A SWITCHING REGULATOR, 52kHz SWITCHING FREQ-MAX, PSFM5	获取价格
LM2576BU	MICREL	52kHz Simple 3A Buck Voltage Regulator	获取价格
LM2576BUT&R	MICROCHIP	Switching Regulator, Voltage-mode, 7.5A, 63kHz Switching Freq-Max, PSSO5, TO-263, 5 PIN	获取价格
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LM2576D2T-005G	ONSEMI	3.0 A, 15 V, Step−Down Switching Regulator	获取价格

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