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发布者:微桥 发布时间:2010/1/1 阅读:5223次    关键字: AX3111
AX3111-PWM 3A Step-Down Converter


AX3111-PWM Control 3A Step-Down Converter DataSheet

AX3111(52Khz~380Khz Build in HV MOSFET.40V/3A DC/DC ) + AX358 (OVP+OCP )High Efficiency solution For 5V/2A 5V/2.1A solution

Vin : 10V~40V
Vout : 5V/2A 5V/2.1A 
* Freq=50Khz~380Khz adj
* Build 3A MOSFET. Efficiency 90% .
* EMI & TMC Approval available


    AX3111为一颗设计耐压高达40V,电流3APWM降压芯片, IC内置MOS,独特的开关频率可调设计,同等规格方案中设计效率高,在带来高效性能的同时也解决设计空间小的烦恼,满足市场主流的外观idea及安全规范测试要求! 产品内置过压,短路,过温保护&自动恢复等功能,外围线路简单,非常适合Mini Car Charger--1~2.1A方案,工作时效率可达90%,非常适合mini及双USB车充方案.

GENERAL DESCRIPTION
    AX3111 consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc.
    AX3111 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 is build out soft start function that prevents overshoot and inrush current at startup. 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. The operating frequency is decided by outside resistance. An external compensation is easily to system stable; the low ESR output capacitor can be used.
    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 with exposed pad and TDFN-10L packages, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 40V, it is also suitable for the operation via an AC adapter.

FEATURES
- Input voltage:8V to 40V
- Output voltage:3.3V to 38V
- Duty ratio:0% to 100% PWM control
- Oscillation frequency range is 50K~350KHz by outside resistance setting
- Enable with Soft-Start function
- Current Limit, Short Circuit Protect (SCP) and Thermal Shutdown protection
- Built-in internal SW P-channel MOS.
- SOP-8L-EP and TDFN-10L Pb-Free packages.

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