深圳市四海恒通科技有限公司 （非本站正式会员）

 AX2002/A  2A,0.25V反馈电压，DC/DC降压型LED驱动IC

性能描述：

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 abl e to the duty ratio linearly from 0 up to 100%. An enable function, an over cu rrent protect function and short circuit protect function are built inside, and when OCP or SCP happens, t he 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 consum ption. Since this converter can accommodate an input voltage up to 23V, it is  also suitable for the operation via an AC adapter. 

特点：

n  输入电压范围：3.6V to 23V

n  输出电压：0.25V to VCC

n  应用于LED背光和大功率LED

n  占空系数：º0% to 100% PWM control

n  固定频率：AX2002: 330KHz typ.

                        AX2002A: 500KHz typ.

n  使能端具有开/关控制功能.

n  过流保护，过热保护和短路保护.

n  内置开关P沟道MOS

n  No output capacitor is stable. 不用电容就能稳定

n  SOP-8L无铅封装。

AX2002应用产品：

    大功率手电筒，红外灯板，MR16射灯，LED照明