原创优势供应原装进口：ACT4523/ACT4070YH 原装

 2012-7-3 15:35  959 6 6 分类: 消费电子

　ACT4523简介
　　• 40V Input Voltage Surge
　　• 36V Steady State Operation
　　• Up to 3A output current
　　• Patent Pending Active CC Sensorless Constant
　　Current Control
　　− Integrated Current Control Improves
　　Efficiency, Lowers Cost, and Reduces
　　Component Count
　　• Resistor Programmable
　　− Current Limit from 1.5A to 3A
　　− Patented Cable Compensation from 0Ω to
　　0.3Ω
　　• ±7.5% CC Accuracy
　　− Compensation of Input /Output Voltage Change
　　− Temperature Compensation
　　− Independent of inductance and Inductor DCR
　　• 2% Feedback Voltage Accuracy
　　• Up to 94% Efficiency
　　• 225kHz Switching Frequency Eases EMI Design
　　• Advanced Feature Set
　　− Integrated Soft Start
　　− Thermal Shutdown
　　− Secondary Cycle-by-Cycle Current Limit
　　− Protection Against Shorted ISET Pin
　　• SOP-8EP Package
　　APPLICATIONS
　　• Car Charger/ Adaptor
　　• Rechargeable Portable Devices
　　• General-Purpose CC/CV Supply
　　GENERAL DESCRIPTION
　　ACT4523 is a wide input voltage, high efficiency Active CC step-down DC/DC converter that
　　operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode.
　　ACT4523 provides up to 3A output current at 225kHz switching frequency.Active CC is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. Active CC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limit. The ACT4523 achieves higher efficiency than traditional constant current switching regulators by eliminating its associated power loss. Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit. The devices are available in a SOP-8EP
　　package and require very few external devices for operation.