ACT4514SH-T データシートの表示（PDF） - Active-Semi, Inc
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ACT4514SH-T Datasheet PDF : 16 Pages
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Active-Semi
ACT4514
Rev 1, 21-Jul-11
Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
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.
Innovative PowerTM
CC/CV Curve vs. Load Current
6.0
V0UT = 5V
5.0
4.0
3.0
VIN = 12V
VIN = 24V
2.0
1.0
0.0
0
150
300
450
600
750
900
IOUT Current (mA)
-1-
www.active-semi.com
Copyright © 2011 Active-Semi, Inc.
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