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ACT4514 Datasheet(PDF) 1 Page - Active-Semi, Inc |
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ACT4514 Datasheet(HTML) 1 Page - Active-Semi, Inc |
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1 / 16 page  Innovative Power TM - 1 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. FEATURES • Up to 40V Input Voltage • Up to 1.5A Constant Output Current • Output Voltage up to 12V • Patent Pending ActiveCC Constant Current Control − Integrated Current Control Improves Efficiency, Lowers Cost, and Reduces Component Count • Resistor Programmable Outputs − Current Limit from 400mA to 1500mA − Patented cable compensation from DC Cable Compensation from 0Ω to 0.5Ω • 2% Feedback Voltage Accuracy • Up to 93% Efficiency • 210kHz 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-8 Package APPLICATIONS • Car Charger • Rechargeable Portable Devices • General-Purpose CC/CV Power Supply GENERAL DESCRIPTION ACT4514 is a wide input voltage, high efficiency ActiveCC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4514 provides up to 1.5A output current at 210kHz switching frequency. ActiveCC is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and high- brightness LED drive for architectural lighting. The ACT4514 achieves higher efficiency than traditional constant current switching regulators by eliminating the sense resistor and 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-8 package and require very few external devices for operation. ACT4514 Wide-Input Sensorless CC/CV Step-Down DC/DC Converter Active-Semi Rev 1, 21-Jul-11 CC/CV Curve vs. Load Current 6.0 5.0 4.0 3.0 2.0 1.0 0.0 IOUT Current (mA) 0 150 300 450 600 750 900 VIN = 12V VIN = 24V V0UT = 5V |
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