4-12V可调直流稳压电源_百度文库
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4-12V可调直流稳压电源
它​能​确​保​在​电​力​网​交​流​电​压​发​生​波​动​或​负​载​发​生​变​化​时​,​输​出​稳​定​的​直​流​电​压​,​例​如​我​们​较​为​常​用​的V​、2​V​、.V​直​流​电​源​。​这​些​电​源​在​实​验​室​中​我​们​用​一​些​“​直​流​稳​压​电​源​一​个​低​纹​波​、​高​精​度​的​稳​压​源​。​然​而​这​种​仪​器​往​往​价​格​昂​贵​,​因​此​为​了​寻​求​一​种​稳​定​,​高​效​,​且​价​格​低​廉​的​稳​压​直​流​电​源​的​替​代​品​,​我​们​采​用​以​串​联​型​稳​压​电​路​为​核​心​利​用​深​度​串​联​电​压​负​反​馈​原​理​来​达​到​稳​压​目​,​设​计​的​一​款​用​分​立​元​器​件​组​成​的​可​调​直​流​稳​压​电​源​。
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你可能喜欢LM25118-Q1 | 降压/升压、反向控制器 | 控制器（外部开关） | 描述与参数
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LM25118-Q1
(正在供货)
Wide Voltage Range Buck-Boost Controller
&(英文內容)
In English
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相关终端应用
The LM25118 wide voltage range Buck-Boost switching regulator controller features all of
the functions necessary to implement a high performance, cost efficient Buck-Boost regulator using
a minimum of external components. The Buck-Boost topology maintains output voltage regulation when
the input voltage is either less than or greater than the output voltage making it especially
suitable for automotive applications. The LM25118 operates as a buck regulator while the input
voltage is sufficiently greater than the regulated output voltage and gradually transitions to the
buck-boost mode as the input voltage approaches the output. This dual mode approach maintains
regulation over a wide range of input voltages with optimal conversion efficiency in the buck mode
and a glitch-free output during mode transitions. This easy to use controller includes drivers for
the high side buck MOSFET and the low side boost MOSFET. The regulator&s control method is based
upon current mode control utilizing an emulated current ramp. Emulated current mode control reduces
noise sensitivity of the pulse-width modulation circuit, allowing reliable control of the very
small duty cycles necessary in high input voltage applications. Additional protection features
include current limit, thermal shutdown and an enable input. The device is available in a power
enhanced HTSSOP-20 package featuring an exposed die attach pad to aid thermal
dissipation.
LM25118Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (–40&C to 125&C Operating Junction Temperature) Input Voltage Operating Range from 3 V to 42 V Emulated Peak Current Mode Control Smooth Transition Between Step-Down and Step-Up Modes Switching Frequency Programmable to 500 KHz Oscillator Synchronization Capability Internal High Voltage Bias Regulator Integrated High and Low-Side Gate Drivers Programmable Soft-Start Time Ultra Low Shutdown Current Enable Input Wide Bandwidth Error Amplifier 1.5% Feedback Reference Accuracy Thermal Shutdown Package: HTSSOP-20 (Exposed Pad)
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Switching Frequency
Undervoltage Lockout
Soft Start
Regulated Outputs
Market Segment
Control Mode
Special Features
Operating Temperature Range
Pin/Package
Approx. Price (US$)
LM25118-Q1
Automotive
Automotive
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Automotive & Transportation
Automotive & Transportation
Automotive & Transportation
Automotive & Transportation
Current Mode
Current Mode
Current Mode
Current Mode
Buck-Boost
Buck-Boost
Buck-Boost
Buck-Boost
Frequency Synchronization
Frequency Synchronization
Frequency Synchronization
Frequency Synchronization
-40 to 125
-40 to 125
-40 to 125
-40 to 125
2.30 | 1ku
2.00 | 1ku
2.38 | 1ku
2.75 | 1ku
其它合格版本 LM25118-Q1
TI 的标准目录产品
相关终端应用
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New! Interactive Design
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Explore Now求最简单的一个220V变直流12V的电源原理图_百度文库
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求最简单的一个220V变直流12V的电源原理图
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你可能喜欢求个12V变5V电压的电路图_百度知道
求个12V变5V电压的电路图
不要7850那些的 直流12V变5V
要外接光驱的 稳定一点的 不要发热量巨大的
提问者采纳
那就用LM2576。它的效率比常用的三段线性降压稳压器要高的多，它的发热量较小，一般情况下只要很小的散热片，它的基本电路如下图。
提问者评价
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为您推荐：
其他3条回答
建议用开关电源从12-8或9V，再用LDO转5V，电流更加干净。这个电路前端加了压敏电阻、保险丝、瞬变电压抑制二极管、防反二极管等保护器件，然后通过LM2576-ADJ转8V，电流3A，再通过1117-ADJ转5V，电流看1117，好像是800mA，如果要大电流，换LDO就行了
直接买一个12V变5V的驱动电路不就行了 ......
工具必备 买毛啊
因为你是直流，接上一个限流电阻就可以了。电阻的分辨率用好的。可以达到限压。
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电路图的相关知识
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出门在外也不愁LM25118_百度文库
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电​源​方​案
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