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发布者:来自网络 发布时间:2009/12/27 阅读:5950次   
亚瑟莱特推出车载专用PWM电源管理IC AX3010/3011


亚瑟莱特推出车载专用PWM电源管理IC AX3010/3011

亚瑟莱特(AXElite)科技日前宣布推出车载专用PWM电源管理IC。AX3010/3011系列为一颗脉波宽度调变输出的异步流降压转换器,输入电压最高可到45伏特,输出电压可以依需要调整最低1.155伏特到最高38伏特,非常适合于汽车用电子系统,车用充电装置等车载系统的电压转换。

AX3010/3011应用上可提供高转换效能(可达90%)及稳定的工作电压,输出电压的瞬时响应快,而输出电容适用于电解电容或陶瓷电容,其内部具有完整的系统保护功能包括暖开机, 短路保护(SCP) 、过温度保护(OTP)及过电流保护(OCP)功能,并整合了两种型式(内部或外部关断功能)的过电压保护机制(OVP)以避免过电压时对电路烧毁之风险, 而在短路保护时会将原先频率降低(AX3010/3011降为10KHz, AX3010A/3011A降为20KHz),降低短路时IC所消耗能量,避免IC过热。

AX3010/3011采用标准含散热片之SOP-8LEP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,具有散热片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。

AX3010/A APPLICATION CIRCUIT
AX3010/A APPLICATION CIRCUIT

AX3011/A APPLICATION CIRCUIT
AX3011/A APPLICATION CIRCUIT

AX3010/A-50K/150KHz,2A PWM Buck DC/DC Converter DataSheet

GENERAL DESCRIPTION
    The AX3010/A series are monolithic IC designed for a step-down DC/DC converter,and own the ability of driving a 2A load without additional transistor. It saves board space.The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage; current limit is against over current operating of the output switch that set by outside resistance. If current limit function occurs and VFB is down below 0.3V, the switching frequency will be reduced to 10 KHz for AX3010 and 20K for AX3010A; and over voltage protection (OVP) that can avoid high VOUT voltage to damage circuit and capacitor. The EN/SS pin supply soft-start function that prevents overshoot and inrush current at startup, the soft-start time is be set up by outside capacitance. The chip is available in SOP-8L-EP package which features small size as SOP-8 with an Exposed Pad to reduce the junction-to-case resistance.

FEATURES
- Maximum adjustable output voltage up to 38V.
- Typical switching frequency:
AX3010 is 50K Hz.
AX3010A is 150K Hz.
- Voltage mode non-synchronous PWM converter.
- Thermal-shutdown and current-limit protection.
- ON/OFF shutdown and soft-start control input.
- Short Circuit Protect (SCP).
- External current limit setting.
- Over Voltage Protect (OVP).
- Operating voltage can be up to 40V.
- Output load current: 2A.
- SOP-EP Pb-Free package.
- Built-in switching transistor on chip.

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