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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qIZ嘉泰姆

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

 QQ截图20160419174301.jpgqIZ嘉泰姆

 五,产品封装图 (Package)qIZ嘉泰姆


image.pngqIZ嘉泰姆

PINqIZ嘉泰姆

NAMEqIZ嘉泰姆

DISCRIPTIONqIZ嘉泰姆

1qIZ嘉泰姆

BOOTqIZ嘉泰姆

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

2qIZ嘉泰姆

SWqIZ嘉泰姆

Power Switching Output to External InductorqIZ嘉泰姆

3qIZ嘉泰姆

ISENqIZ嘉泰姆

Current Sense InputqIZ嘉泰姆

4qIZ嘉泰姆

VOUTqIZ嘉泰姆

Output of DC/DC Converter, Connect To The Anodes OfqIZ嘉泰姆
Output Capacitor
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5qIZ嘉泰姆

VFBqIZ嘉泰姆

The Feedback Of Output Voltage, Connect To The DividerqIZ嘉泰姆
Resistor
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6qIZ嘉泰姆

COMPqIZ嘉泰姆

Error Amplifier Output. This pin is used to compensate theqIZ嘉泰姆
Converter.
qIZ嘉泰姆

7qIZ嘉泰姆

VINqIZ嘉泰姆

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

8qIZ嘉泰姆

GNDqIZ嘉泰姆

GroundqIZ嘉泰姆

六.电路原理图qIZ嘉泰姆


image.pngqIZ嘉泰姆

七,功能概述qIZ嘉泰姆


As seen in Functional Block Diagram, the CXLE8854B is a peak current mode pulse width modulationqIZ嘉泰姆
(PWM) converter with CC and CV control. The converter operates as follows:qIZ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.qIZ嘉泰姆
At this point, the SW side of the inductor swings to a diode voltage below ground, causing theqIZ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.qIZ嘉泰姆
The Oscillator normally switches at 200KHz. However, if FB voltage is less than 0.45V, then theqIZ嘉泰姆
switching frequency decreases until it reaches a typical value of 30KHz at VFB = 0.15VqIZ嘉泰姆
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CXLE8844qIZ嘉泰姆

6V-100VqIZ嘉泰姆

扩流3AqIZ嘉泰姆

3%qIZ嘉泰姆

 

95%qIZ嘉泰姆

200KHzqIZ嘉泰姆

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SOT-26qIZ嘉泰姆

CXLE8845qIZ嘉泰姆

8V-45VqIZ嘉泰姆

3AqIZ嘉泰姆

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95%qIZ嘉泰姆

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95%qIZ嘉泰姆

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TO263-5LqIZ嘉泰姆

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5V-36VqIZ嘉泰姆

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96%qIZ嘉泰姆

380KHzqIZ嘉泰姆

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CXLE8849qIZ嘉泰姆

4.5V-45VqIZ嘉泰姆

2AqIZ嘉泰姆

2%qIZ嘉泰姆

 

83%qIZ嘉泰姆

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89%qIZ嘉泰姆

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89%qIZ嘉泰姆

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2%qIZ嘉泰姆

 

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97%qIZ嘉泰姆

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