深圳市四海恒通科技有限公司 （非本站正式会员）

AX3121  3.5A同步整流降压型转换器

 性能描述

      AX3121 consists of step-down switching regulator with synchronous PWM converter. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and NMOS etc.

      AX3121 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 an enable/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 external compensation is easily to system stable.

      With the addition of internal PMOS and NMOS, a coil and capacitors 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-EP package, providing such outstanding  as low current consumption. Since this converter can accommodate an input voltage up to 23V. 

特点

l  输入电压：4.5V to 23V

l  输出电压：VFB to VCC

l  占空系数：0% to 100% PWM control

l  固定频率：250KHz typ.

l  Enable/Soft-Start and Current Limit (CL).

l  过热关断保护

l  短路保护

l  内置开关P沟道和N沟道MOS

l  SOP-8L裸焊盘无铅封装