深圳市四海恒通科技有限公司 （非本站正式会员）

AX3108  3A  PWM控制降压型转换器

性能描述

      AX3108 consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AX3108 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. 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  as low current consumption. Since this converter can accommodate an input voltage up to 20V, it is also suitable for the operation via an AC adapter.

l  输入电压：3.6V to 20V

l  输出电压：0.8V to VCC

l  占空系数：0% to 100% PWM control

l  固定频率：330KHz typ.

l  软启动，限流及使能端控制功能

l  过热保护

l  短路保护

l  内置开关P沟道MOS

l  Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.

l  SOP-8L 无铅封装