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发布者:微桥 发布时间:2009/12/27 阅读:9290次   
亚瑟莱特推出AX2002A/3A系列直流降压转换器


亚瑟莱特(AXElite)科技日前推出AX2002A/2003A/AX2201A系列脉波宽度调变输出直流降压转换器(AX2201A可弹性选择外部P-MOS),该系列降压转换器利用回授电阻来控制LED的电流,回授电压只有0.25V,可大幅减小回授电阻的功率。其输入电压范围可由最低3.6伏特到最高24伏特,输出最高可串接7个Power-LED,非常适合于液晶电视/屏幕,手电筒,E27,MR16杯灯装置。

亚瑟莱特推出AX2002A/3A系列直流降压转换器

AX2002A/2003A/AX2201A应用上可提供高转换效能及稳定的工作电压,其内部具有完整的系统保护功能包括软激活(SS)、短路保护(SCP)、过温度保护及过电流保护(OCP)功能,切换频率固定为500Khz,并可搭配小容量陶瓷电容和低感量的电感便能达到无闪频,无光衰的稳定供电模式。

AX2002A/2003A/AX2201A采用标准的SOP-8L无铅封装与极少的外部组件可大幅缩小印刷电路板的面积,具有散热功能可以将热导至印刷电路板上,大幅降低组件表面温度以符合客户需求,经照明客户的验证为目前性价比最高的Power LED照明驱动方案。

AX2002/A-2A, 0.25V Feedback Voltage Step-Down Switching Regulators for LED Driver PDF文档下载

GENERAL DESCRIPTION
    AX2002/A consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc.
    AX2002/A provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to 100%. An enable function, an over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also, an internal compensation block is built in to minimum external component count.
    With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L package,providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter.

FEATURES
- Input voltage:3.6V to 23V
- Output voltage:0.25V to VCC
- LED Backlight and High Power LED Application
- Duty ratio:0% to 100% PWM control
- Oscillation frequency:
   AX2002: 330KHz typ.
   AX2002A: 500KHz typ.
- Enable/Disable function.
- Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP).
- Built-in internal SW P-channel MOS.
- No output capacitor is stable.
- SOP-8L Pb-Free package.

>>> AX2002 Data Sheet: >>> AX2003 Data Sheet:
>>> AX2002 for MR-16 : >>> AX2002 for MR-16 Bom List:
>>> AX2002_AX2003 for MR-16 PCB document: >>> AX2002_2003 样品/演示板申请(sample&demo request) >>>

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