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发布者:来自网络 发布时间:2014/10/29 阅读:2737次    关键字: DC-DC
EUP3490-3A,40V,200KHz降压型DC-DC变换器


EUP3490-3A,40V,200KHz降压型DC-DC变换器 DataSheet 

概述
    EUP3490是一款采用电流模脉宽调制架构的降压型DC-DC变换器,可以提供高达3A的负载电流,具有很好的线性调整率和负载调整率。EUP3490可以在4.75V~40V宽输入电压范围内稳定工作,通过外部分压电阻调节实现0.92~15V的输出电压。输出电流阈值通过外部电阻来设定,当输出电流达到设定的阈值时,EUP3490进入恒流工作模式。输出过压阈值通过外部分压电阻来设定,当输出电压达到设定的阈值时,EUP3490停止工作。在大负载时,EUP3490工作在脉冲宽度调制模式。在轻负载时,EUP3490工作在跳周期模式以提高效率。
    EUP3490具有次级周期性的峰值电流限制和过温等保护机制,以确保芯片工作的安全性。芯片在关断模式下的静态电流可低至3μA。 具有内部软启动功能可以很好的抑制浪涌电流和输出电压的过冲。
    EUP3490以通过少数量的标准外围器件实现变换器功能,有效的节省了应用空间。EUP3490采用SOP-8(EP)封装,工作温度范围为-40℃到+85℃。

特点
●输入电压范围:4.75V至40V
●输出电压可调:0.92V至15V
●高达3A的输出电流
●轻负载自动跳周期模式
●可编程输出电流阈值
●可编程输出过压阈值
●关断电流低至3μA
●内部集成0.1Ω的DMOS开关管
●效率高达95%
●200KHz固定开关频率
●芯片内部软启动
●次级周期性的峰值电流限制保护
●过温保护
●输入欠压锁定
●SOP-8封装
●符合RoHS规范及Pb-Free

应用
●车载充电器/适配器
●可充电便携式设备
●分布式电源系统
●为线性稳压器供电


EUP3490-3A,40V,200KHz Step-Down Converter 

Description
The EUP3490 is current mode, step-down switching regulator capable of driving 3A continuous load with excellent line and load regulation. The EUP3490 operates with an input voltage range from 4.75V to 40V and the output voltage is externally set from 0.92V to 15V with a resistor divider. The output current threshold is programmed by an external resistor.
The EUP3490 enters the CC (constant current) mode when output reaches over current threshold. The OV (over voltage) threshold is programmed by an external resistor divider. The EUP3490 stops switching when output reaches over voltage threshold. At heavy load, the EUP3490 operates at a fixed frequency Pulse-Width Modulation mode. At light load, the EUP3490 operates at a Pulse-Skipping Mode to improve efficiency.
Fault condition protection includes secondary cycle-by-cycle current limit and thermal shutdown. In shutdown mode the regulator draws 3μA of supply current. Internal soft-start minimizes the inrush supply current and the output overshoot at initial startup.
The EUP3490 require a minimum number of external components.

Feature
●4.75V to 40V Wide Input Operating Range
●Output Adjustable from 0.92V to 15V
●Up to 3A Output Current
●Automatic Pulse Skipping Mode at Light Load
●Programmable Output Current Threshold
●Programmable Output Over Voltage Threshold
●3μA Low Shutdown Current
●0.1Ω Internal DMOS Output Switch
●Up to 95% Efficiency
●Fixed 200kHz Switching Frequency
●Internal Soft Start
●Secondary Cycle-by-Cycle Current Limit
●Thermal Shutdown
●Input Supply Undervoltage Lockout
●Available SOP-8 Package
●RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free

Application
●Car Charger/Adaptor
●Rechargeable Portable Devices
●Distributive Power Systems
●Pre-regulator for Linear Regulators

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