CXLE8854B

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%

产品手册

产品订购

产品简介

目录JIo嘉泰姆

1.产品概述                       2.产品特点JIo嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 JIo嘉泰姆
5.产品封装图                     6.电路原理图                   JIo嘉泰姆
7.功能概述                        8.相关产品
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一,产品概述(General Description)         JIo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.JIo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.
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    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 adapterJIo嘉泰姆
二.产品特点(Features)
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 Perfect Solution for Car ChargerJIo嘉泰姆
Input Voltage:7V to 40VJIo嘉泰姆
High CC accuracy ±5%JIo嘉泰姆
High CV accuracy ±2%JIo嘉泰姆
Duty ratio:0% to 90% PWM controlJIo嘉泰姆
Oscillation frequency:JIo嘉泰姆
120K Hz for  AJIo嘉泰姆
250K Hz for       BJIo嘉泰姆
Thermal Shutdown function.JIo嘉泰姆
Short Circuit Protect (SCP).JIo嘉泰姆
Built-in internal SW N-channel MOS.JIo嘉泰姆
Current mode non-synchronous PWM converterJIo嘉泰姆
Cycle to cycle Current LimitingJIo嘉泰姆
External current limit setting.JIo嘉泰姆
Under Voltage Lockout.JIo嘉泰姆
Over Voltage Protection.JIo嘉泰姆
三,应用范围 (Applications)JIo嘉泰姆
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四.下载产品资料PDF文档
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 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!JIo嘉泰姆

 QQ截图20160419174301.jpgJIo嘉泰姆

 五,产品封装图 (Package)JIo嘉泰姆


image.pngJIo嘉泰姆

PINJIo嘉泰姆

NAMEJIo嘉泰姆

DISCRIPTIONJIo嘉泰姆

1JIo嘉泰姆

BOOTJIo嘉泰姆

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

2JIo嘉泰姆

SWJIo嘉泰姆

Power Switching Output to External InductorJIo嘉泰姆

3JIo嘉泰姆

ISENJIo嘉泰姆

Current Sense InputJIo嘉泰姆

4JIo嘉泰姆

VOUTJIo嘉泰姆

Output of DC/DC Converter, Connect To The Anodes OfJIo嘉泰姆
Output Capacitor
JIo嘉泰姆

5JIo嘉泰姆

VFBJIo嘉泰姆

The Feedback Of Output Voltage, Connect To The DividerJIo嘉泰姆
Resistor
JIo嘉泰姆

6JIo嘉泰姆

COMPJIo嘉泰姆

Error Amplifier Output. This pin is used to compensate theJIo嘉泰姆
Converter.
JIo嘉泰姆

7JIo嘉泰姆

VINJIo嘉泰姆

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

8JIo嘉泰姆

GNDJIo嘉泰姆

GroundJIo嘉泰姆

六.电路原理图JIo嘉泰姆


image.pngJIo嘉泰姆

七,功能概述JIo嘉泰姆


As seen in Functional Block Diagram, the CXLE8854B is a peak current mode pulse width modulationJIo嘉泰姆
(PWM) converter with CC and CV control. The converter operates as follows:JIo嘉泰姆
A switching cycle starts when the rising edge of the Oscillator clock output causes the
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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.JIo嘉泰姆
At this point, the SW side of the inductor swings to a diode voltage below ground, causing theJIo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.JIo嘉泰姆
The Oscillator normally switches at 200KHz. However, if FB voltage is less than 0.45V, then theJIo嘉泰姆
switching frequency decreases until it reaches a typical value of 30KHz at VFB = 0.15VJIo嘉泰姆
八,相关产品                 更多同类产品......
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降压型LED射灯驱动IC JIo嘉泰姆

型号JIo嘉泰姆

工作电压范围JIo嘉泰姆

输出电流JIo嘉泰姆

输出电JIo嘉泰姆

流精度JIo嘉泰姆

线性调JIo嘉泰姆

整率JIo嘉泰姆

效率JIo嘉泰姆

工作频率JIo嘉泰姆

调光功能JIo嘉泰姆

封装 JIo嘉泰姆

CXLE8835ESJIo嘉泰姆

6V-40VJIo嘉泰姆

1.2AJIo嘉泰姆

3%JIo嘉泰姆

1.50%JIo嘉泰姆

98%JIo嘉泰姆

1MHz(max)JIo嘉泰姆

PWM调光JIo嘉泰姆

ESOP8JIo嘉泰姆

CXLE8835MRJIo嘉泰姆

6V-40VJIo嘉泰姆

1.2AJIo嘉泰姆

3%JIo嘉泰姆

1.50%JIo嘉泰姆

98%JIo嘉泰姆

1MHz(max)JIo嘉泰姆

PWM调光JIo嘉泰姆

SOT-26JIo嘉泰姆

CXLE8836JIo嘉泰姆

6V-60VJIo嘉泰姆

1.2AJIo嘉泰姆

2%JIo嘉泰姆

 

94%JIo嘉泰姆

1.1MHzJIo嘉泰姆

PWM/模拟 调光JIo嘉泰姆

SOT-89-5JIo嘉泰姆

CXLE8837JIo嘉泰姆

2V-6.5VJIo嘉泰姆

0.95AJIo嘉泰姆

10%JIo嘉泰姆

0.45%JIo嘉泰姆

92%JIo嘉泰姆

1.4 MHzJIo嘉泰姆

PWM调光JIo嘉泰姆

SOT-25JIo嘉泰姆

CXLE8838JIo嘉泰姆

2.5V-5.5VJIo嘉泰姆

0.7AJIo嘉泰姆

3%JIo嘉泰姆

 

93%JIo嘉泰姆

1.4MHzJIo嘉泰姆

PWM调光JIo嘉泰姆

SOT-25JIo嘉泰姆

CXLE8839JIo嘉泰姆

5.5V-36VJIo嘉泰姆

扩流2.5AJIo嘉泰姆

1%JIo嘉泰姆

 

96%JIo嘉泰姆

1MHzJIo嘉泰姆

PWM调光JIo嘉泰姆

SOT-26JIo嘉泰姆

CXLE8840JIo嘉泰姆

4V--28VJIo嘉泰姆

扩流25WJIo嘉泰姆

1%JIo嘉泰姆

 

96%JIo嘉泰姆

2MHzJIo嘉泰姆

PWM/模拟 调光JIo嘉泰姆

SOT-26JIo嘉泰姆

CXLE8841JIo嘉泰姆

2.5V-100VJIo嘉泰姆

扩流2.5AJIo嘉泰姆

1%JIo嘉泰姆

 

90%JIo嘉泰姆

1MHzJIo嘉泰姆

PWM调光JIo嘉泰姆

SOT-26JIo嘉泰姆

CXLE8842JIo嘉泰姆

5-100VJIo嘉泰姆

1.5AJIo嘉泰姆

1%JIo嘉泰姆

 

92%JIo嘉泰姆

1MHzJIo嘉泰姆

PWM/模拟 调光JIo嘉泰姆

ESOP8JIo嘉泰姆

CXLE8843JIo嘉泰姆

5-100VJIo嘉泰姆

2.5AJIo嘉泰姆

1%JIo嘉泰姆

 

92%JIo嘉泰姆

1MHzJIo嘉泰姆

PWM/模拟 调光JIo嘉泰姆

ESOP8JIo嘉泰姆

CXLE8844JIo嘉泰姆

6V-100VJIo嘉泰姆

扩流3AJIo嘉泰姆

3%JIo嘉泰姆

 

95%JIo嘉泰姆

200KHzJIo嘉泰姆

PWM调光JIo嘉泰姆

SOT-26JIo嘉泰姆

CXLE8845JIo嘉泰姆

8V-45VJIo嘉泰姆

3AJIo嘉泰姆

3%JIo嘉泰姆

 

95%JIo嘉泰姆

220KHzJIo嘉泰姆

 

ESOP8JIo嘉泰姆

CXLE8846JIo嘉泰姆

8V-40VJIo嘉泰姆

4AJIo嘉泰姆

3%JIo嘉泰姆

 

95%JIo嘉泰姆

220KHzJIo嘉泰姆

PWM调光JIo嘉泰姆

TO252-5LJIo嘉泰姆

CXLE8847JIo嘉泰姆

8V-40VJIo嘉泰姆

5AJIo嘉泰姆

3%JIo嘉泰姆

 

95%JIo嘉泰姆

220KHzJIo嘉泰姆

 

TO263-5LJIo嘉泰姆

CXLE8848JIo嘉泰姆

5V-36VJIo嘉泰姆

1.5AJIo嘉泰姆

2%JIo嘉泰姆

 

96%JIo嘉泰姆

380KHzJIo嘉泰姆

PWM调光JIo嘉泰姆

SOP-8JIo嘉泰姆

CXLE8849JIo嘉泰姆

4.5V-45VJIo嘉泰姆

2AJIo嘉泰姆

2%JIo嘉泰姆

 

83%JIo嘉泰姆

150KHzJIo嘉泰姆

 PWM调光JIo嘉泰姆

ESOP8JIo嘉泰姆

CXLE8850JIo嘉泰姆

8V-45VJIo嘉泰姆

3AJIo嘉泰姆

2%JIo嘉泰姆

 

89%JIo嘉泰姆

150KHzJIo嘉泰姆

 

ESOP8JIo嘉泰姆

CXLE8851JIo嘉泰姆

8V-40VJIo嘉泰姆

3AJIo嘉泰姆

2%JIo嘉泰姆

 

89%JIo嘉泰姆

180KHzJIo嘉泰姆

 

SOP8JIo嘉泰姆

CXLE8852JIo嘉泰姆

8V-40VJIo嘉泰姆

3.5AJIo嘉泰姆

2%JIo嘉泰姆

 

87%JIo嘉泰姆

180KHzJIo嘉泰姆

 PWM调光JIo嘉泰姆

ESOP8JIo嘉泰姆

CXLE8853JIo嘉泰姆

8V-40VJIo嘉泰姆

2AJIo嘉泰姆

2%JIo嘉泰姆

 

89%JIo嘉泰姆

110KHzJIo嘉泰姆

 

SOP8JIo嘉泰姆

CXLE8854BJIo嘉泰姆

7V-40VJIo嘉泰姆

2.5AJIo嘉泰姆

2%JIo嘉泰姆

 

89%JIo嘉泰姆

250KHzJIo嘉泰姆

 

ESOP8JIo嘉泰姆

CXLE8855JIo嘉泰姆

8V-40VJIo嘉泰姆

5AJIo嘉泰姆

2%JIo嘉泰姆

 

86%JIo嘉泰姆

150KHzJIo嘉泰姆

 

TO263-5LJIo嘉泰姆

CXLE8835JIo嘉泰姆

6V-40VJIo嘉泰姆

1.2AJIo嘉泰姆

3%JIo嘉泰姆

1.50%JIo嘉泰姆

98%JIo嘉泰姆

1MHz(max)JIo嘉泰姆

PWM调光JIo嘉泰姆

SOT89-5JIo嘉泰姆

CXLE8835BJIo嘉泰姆

6V-34VJIo嘉泰姆

1.0AJIo嘉泰姆

5%JIo嘉泰姆

1.50%JIo嘉泰姆

97%JIo嘉泰姆

1MHz(max)JIo嘉泰姆

PWM/模拟 调光JIo嘉泰姆

SOT89-5JIo嘉泰姆

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下一篇▶:CXLE8855 CXLE8835 CXLE8835B高效降压型DC转换器工作在DC8V到36V输入电压范围低纹波内置功率MOS固定频率振荡器与频率补偿电路PWM控制环路调节占空比从0~100%之间线性变化