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ACT4303 Datasheet(PDF) 1 Page - Active-Semi, Inc |
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ACT4303 Datasheet(HTML) 1 Page - Active-Semi, Inc |
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1 / 15 page  Innovative Power TM - 1 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. FEATURES • 32V Input Voltage Surge • 30V Steady State Input Voltage • Up to 3A Output Current • Output Voltage up to 12V • 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 • ±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 • USB Chargers • LCD TV and Monitors • Digital Video Recorders • Set-Top Box • Battery Chargers • General-Purpose CC/CV Power Supplies GENERAL DESCRIPTION ACT4303 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. ACT4303 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 ACT4303 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. ACT4303 30V/3A Sensorless CC/CV Step-Down DC/DC Converter Active-Semi Rev 0, 05-Dec-11 Output Current (A) 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 6.0 5.0 4.0 3.0 2.0 1.0 0.0 CC/CV Curve VIN = 24V VIN = 12V ACT4303 HSB IN EN COMP FB SW ISET Input 10V~30V GND C4 100µF D1 SK34 R2 52k C2 2.2nF R3 8.2k R1 11.5k C1 47µF R4 10k L1 30µH C3 22nF 5V |
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