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ACT4533 Datasheet(PDF) 1 Page - Active-Semi, Inc |
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ACT4533 Datasheet(HTML) 1 Page - Active-Semi, Inc |
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1 / 16 page  Innovative Power TM - 1 - www.active-semi.com Copyright © 2013 Active-Semi, Inc. FEATURES • 40V Input Voltage Surge • 32V Steady State Operation • Up to 3A Output Current • Constant Current Output with Input up to 32V • Output Voltage up to 12V • 125kHz Switching Frequency Eases EMI Design • Good EMI Performance to Pass EN55022 Radiation Regulation without adding EMI Components • 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 0 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 92% Efficiency • 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 ACT4533 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. ACT4533 provides up to 3A output current at 125kHz 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 ACT4533 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. ACT4533 Wide-Input Sensorless CC/CV Step-Down DC/DC Converter Output Current (mA) 0 400 800 1200 1600 2000 2400 2800 6.0 5.0 4.0 3.0 2.0 1.0 0.0 CC/CV Curve VIN = 24V VIN = 18V Rev 1, 25-Feb-13 VIN = 12V |
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