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首页 > 产品中心 > LED驱动电路 > LED路灯草坪灯车灯台灯闪灯射灯照明驱动IC > 降压型LED射灯驱动IC >CXLE8854B宽输入电压高效率的CC和CV降压DC/DC变换器在CV(恒定输出电压)模式或CC(恒定输出电流)模式低纹波功率高效率和良好的暂态特性PWM控制电路能使占空比线性化为0~90%
CXLE8854B宽输入电压高效率的CC和CV降压DC/DC变换器在CV(恒定输出电压)模式或CC(恒定输出电流)模式低纹波功率高效率和良好的暂态特性PWM控制电路能使占空比线性化为0~90%
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CXLE8854B是一种宽输入电压、高效率的CC和CV降压DC/DC变换器,工作在CV(恒定输出电压)模式或CC(恒定输出电流)模式下。
CXLE8854B具有低纹波功率、高效率和良好的暂态特性,PWM控制电路能使占空比线性化为0~90%。过电流保护和短路保护功能是建立在外部,它可以设置一个电阻。外部补偿很容易使系统稳定;可以使用低ESR输出电容。通过添加内部N通道功率MOS、线圈、电容器和外部连接的二极管,这些ic可以用作降压开关稳压器。
当与SOP-8L和SOP-8L-EP封装结合使用时,它们是便携式设备的理想电源单元,具有低电流消耗等突出特点。由于这种转换器可以容纳高达40V的输入电压,因此也适合通过交流适配器进行操作
输入电压:7V至40V
高CC精度±5%
高CV精度±2%
占空比:0%到90%的脉宽调制控制
振荡频率:
120K赫兹
B为250kHz
热关机功能。
短路保护(SCP)。
内置SW N通道MOS。
电流型非同步PWM变换器
循环限流
外部电流限制设置。
欠压锁定。
过电压保护。

CXLE8854B宽输入电压高效率的CC和CV降压DC/DC变换器在CV(恒定输出电压)模式或CC(恒定输出电流)模式低纹波功率高效率和良好的暂态特性PWM控制电路能使占空比线性化为0~90%
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产品简介

目录z51嘉泰姆

1.产品概述                       2.产品特点z51嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 z51嘉泰姆
5.产品封装图                     6.电路原理图                   z51嘉泰姆
7.功能概述                        8.相关产品
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一,产品概述(General Description)         z51嘉泰姆


    CXLE8854B is a wide input voltage, high efficiency CC and CV step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode.z51嘉泰姆
   CXLE8854B provides low-ripple power, high efficiency, and excellent transient characteristics.The PWM control circuit is able to the duty ratio linearly forms 0 up to 90%. An over current protection and short circuit protection functions are built outside that it can set by a resistance. An external compensation is easily to system stable;the low ESR output capacitor can be used.With the addition of an internal N-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators.
z51嘉泰姆

    They serve as ideal power supply units for portable devices when coupled with the SOP-8L and SOP-8L-EP packages, providing such outstanding features as low current consumption. Since this converter can accommodate an input oltage up to 40V, it isalso suitable for the operation via an AC adapterz51嘉泰姆
二.产品特点(Features)
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 Perfect Solution for Car Chargerz51嘉泰姆
Input Voltage:7V to 40Vz51嘉泰姆
High CC accuracy ±5%z51嘉泰姆
High CV accuracy ±2%z51嘉泰姆
Duty ratio:0% to 90% PWM controlz51嘉泰姆
Oscillation frequency:z51嘉泰姆
120K Hz for  Az51嘉泰姆
250K Hz for       Bz51嘉泰姆
Thermal Shutdown function.z51嘉泰姆
Short Circuit Protect (SCP).z51嘉泰姆
Built-in internal SW N-channel MOS.z51嘉泰姆
Current mode non-synchronous PWM converterz51嘉泰姆
Cycle to cycle Current Limitingz51嘉泰姆
External current limit setting.z51嘉泰姆
Under Voltage Lockout.z51嘉泰姆
Over Voltage Protection.z51嘉泰姆
三,应用范围 (Applications)z51嘉泰姆
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四.下载产品资料PDF文档
z51嘉泰姆


 需要详细的PDF规格书请扫一扫微信联系我们,还可以获得免费样品以及技术支持!z51嘉泰姆

 QQ截图20160419174301.jpgz51嘉泰姆

 五,产品封装图 (Package)z51嘉泰姆


image.pngz51嘉泰姆

PINz51嘉泰姆

NAMEz51嘉泰姆

DISCRIPTIONz51嘉泰姆

1z51嘉泰姆

BOOTz51嘉泰姆

Power to the internal high-side MOSFET gate driver. Connectz51嘉泰姆
a 10~100nF capacitor from BS pin to SW pin
z51嘉泰姆

2z51嘉泰姆

SWz51嘉泰姆

Power Switching Output to External Inductorz51嘉泰姆

3z51嘉泰姆

ISENz51嘉泰姆

Current Sense Inputz51嘉泰姆

4z51嘉泰姆

VOUTz51嘉泰姆

Output of DC/DC Converter, Connect To The Anodes Ofz51嘉泰姆
Output Capacitor
z51嘉泰姆

5z51嘉泰姆

VFBz51嘉泰姆

The Feedback Of Output Voltage, Connect To The Dividerz51嘉泰姆
Resistor
z51嘉泰姆

6z51嘉泰姆

COMPz51嘉泰姆

Error Amplifier Output. This pin is used to compensate thez51嘉泰姆
Converter.
z51嘉泰姆

7z51嘉泰姆

VINz51嘉泰姆

Power Supply Input. Bypass this pin with a 10μF ceramicz51嘉泰姆
capacitor to GND, placed as close to the IC as possible.
z51嘉泰姆

8z51嘉泰姆

GNDz51嘉泰姆

Groundz51嘉泰姆

六.电路原理图z51嘉泰姆


image.pngz51嘉泰姆

七,功能概述z51嘉泰姆


As seen in Functional Block Diagram, the CXLE8854B is a peak current mode pulse width modulationz51嘉泰姆
(PWM) converter with CC and CV control. The converter operates as follows:z51嘉泰姆
A switching cycle starts when the rising edge of the Oscillator clock output causes the
z51嘉泰姆

High-Side Power Switch to turn on. With the SW side of the inductor now connected to Sense1, the inductor current ramps up to store energy in the magnetic field. The inductor current level is measured by the Current Sense Amplifier and added to the Oscillator ramp signal. If the resulting summation is higherthan the COMP voltage, the output of the PWM Comparator goes high. When this happens or when Oscillator clock output goes low, the High-Side Power Switch turns off.z51嘉泰姆
At this point, the SW side of the inductor swings to a diode voltage below ground, causing thez51嘉泰姆
inductor current to decrease and magnetic energy to be transferred to output. This state continues untilthe cycle starts again. The High-Side Power Switch is driven by logic using BS as the positive rail. This pin is charged to VSW + 5V when the Low-Side Power Switch turns on. The COMP voltage is the integration of the error between FB input and the internal 1V reference. If FB is lower than the reference voltage, COMP tends to go higher to increase current to the output. Output current will increase until it reaches the CC limit set by the R1 resistor. At this point, the device will transition from regulating output voltage to regulating output current, and the output voltage will drop with increasing load.z51嘉泰姆
The Oscillator normally switches at 200KHz. However, if FB voltage is less than 0.45V, then thez51嘉泰姆
switching frequency decreases until it reaches a typical value of 30KHz at VFB = 0.15Vz51嘉泰姆
八,相关产品                 更多同类产品......
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封装 z51嘉泰姆

CXLE8835ESz51嘉泰姆

6V-40Vz51嘉泰姆

1.2Az51嘉泰姆

3%z51嘉泰姆

1.50%z51嘉泰姆

98%z51嘉泰姆

1MHz(max)z51嘉泰姆

PWM调光z51嘉泰姆

ESOP8z51嘉泰姆

CXLE8835MRz51嘉泰姆

6V-40Vz51嘉泰姆

1.2Az51嘉泰姆

3%z51嘉泰姆

1.50%z51嘉泰姆

98%z51嘉泰姆

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PWM调光z51嘉泰姆

SOT-26z51嘉泰姆

CXLE8836z51嘉泰姆

6V-60Vz51嘉泰姆

1.2Az51嘉泰姆

2%z51嘉泰姆

 

94%z51嘉泰姆

1.1MHzz51嘉泰姆

PWM/模拟 调光z51嘉泰姆

SOT-89-5z51嘉泰姆

CXLE8837z51嘉泰姆

2V-6.5Vz51嘉泰姆

0.95Az51嘉泰姆

10%z51嘉泰姆

0.45%z51嘉泰姆

92%z51嘉泰姆

1.4 MHzz51嘉泰姆

PWM调光z51嘉泰姆

SOT-25z51嘉泰姆

CXLE8838z51嘉泰姆

2.5V-5.5Vz51嘉泰姆

0.7Az51嘉泰姆

3%z51嘉泰姆

 

93%z51嘉泰姆

1.4MHzz51嘉泰姆

PWM调光z51嘉泰姆

SOT-25z51嘉泰姆

CXLE8839z51嘉泰姆

5.5V-36Vz51嘉泰姆

扩流2.5Az51嘉泰姆

1%z51嘉泰姆

 

96%z51嘉泰姆

1MHzz51嘉泰姆

PWM调光z51嘉泰姆

SOT-26z51嘉泰姆

CXLE8840z51嘉泰姆

4V--28Vz51嘉泰姆

扩流25Wz51嘉泰姆

1%z51嘉泰姆

 

96%z51嘉泰姆

2MHzz51嘉泰姆

PWM/模拟 调光z51嘉泰姆

SOT-26z51嘉泰姆

CXLE8841z51嘉泰姆

2.5V-100Vz51嘉泰姆

扩流2.5Az51嘉泰姆

1%z51嘉泰姆

 

90%z51嘉泰姆

1MHzz51嘉泰姆

PWM调光z51嘉泰姆

SOT-26z51嘉泰姆

CXLE8842z51嘉泰姆

5-100Vz51嘉泰姆

1.5Az51嘉泰姆

1%z51嘉泰姆

 

92%z51嘉泰姆

1MHzz51嘉泰姆

PWM/模拟 调光z51嘉泰姆

ESOP8z51嘉泰姆

CXLE8843z51嘉泰姆

5-100Vz51嘉泰姆

2.5Az51嘉泰姆

1%z51嘉泰姆

 

92%z51嘉泰姆

1MHzz51嘉泰姆

PWM/模拟 调光z51嘉泰姆

ESOP8z51嘉泰姆

CXLE8844z51嘉泰姆

6V-100Vz51嘉泰姆

扩流3Az51嘉泰姆

3%z51嘉泰姆

 

95%z51嘉泰姆

200KHzz51嘉泰姆

PWM调光z51嘉泰姆

SOT-26z51嘉泰姆

CXLE8845z51嘉泰姆

8V-45Vz51嘉泰姆

3Az51嘉泰姆

3%z51嘉泰姆

 

95%z51嘉泰姆

220KHzz51嘉泰姆

 

ESOP8z51嘉泰姆

CXLE8846z51嘉泰姆

8V-40Vz51嘉泰姆

4Az51嘉泰姆

3%z51嘉泰姆

 

95%z51嘉泰姆

220KHzz51嘉泰姆

PWM调光z51嘉泰姆

TO252-5Lz51嘉泰姆

CXLE8847z51嘉泰姆

8V-40Vz51嘉泰姆

5Az51嘉泰姆

3%z51嘉泰姆

 

95%z51嘉泰姆

220KHzz51嘉泰姆

 

TO263-5Lz51嘉泰姆

CXLE8848z51嘉泰姆

5V-36Vz51嘉泰姆

1.5Az51嘉泰姆

2%z51嘉泰姆

 

96%z51嘉泰姆

380KHzz51嘉泰姆

PWM调光z51嘉泰姆

SOP-8z51嘉泰姆

CXLE8849z51嘉泰姆

4.5V-45Vz51嘉泰姆

2Az51嘉泰姆

2%z51嘉泰姆

 

83%z51嘉泰姆

150KHzz51嘉泰姆

 PWM调光z51嘉泰姆

ESOP8z51嘉泰姆

CXLE8850z51嘉泰姆

8V-45Vz51嘉泰姆

3Az51嘉泰姆

2%z51嘉泰姆

 

89%z51嘉泰姆

150KHzz51嘉泰姆

 

ESOP8z51嘉泰姆

CXLE8851z51嘉泰姆

8V-40Vz51嘉泰姆

3Az51嘉泰姆

2%z51嘉泰姆

 

89%z51嘉泰姆

180KHzz51嘉泰姆

 

SOP8z51嘉泰姆

CXLE8852z51嘉泰姆

8V-40Vz51嘉泰姆

3.5Az51嘉泰姆

2%z51嘉泰姆

 

87%z51嘉泰姆

180KHzz51嘉泰姆

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8V-40Vz51嘉泰姆

2Az51嘉泰姆

2%z51嘉泰姆

 

89%z51嘉泰姆

110KHzz51嘉泰姆

 

SOP8z51嘉泰姆

CXLE8854Bz51嘉泰姆

7V-40Vz51嘉泰姆

2.5Az51嘉泰姆

2%z51嘉泰姆

 

89%z51嘉泰姆

250KHzz51嘉泰姆

 

ESOP8z51嘉泰姆

CXLE8855z51嘉泰姆

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5Az51嘉泰姆

2%z51嘉泰姆

 

86%z51嘉泰姆

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98%z51嘉泰姆

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SOT89-5z51嘉泰姆

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97%z51嘉泰姆

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SOT89-5z51嘉泰姆

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