Active-Semi
FEATURES
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•
•
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Up to 40V Input Voltage
Up to 2A output current
Output Voltage up to 12V
Patent Pending Active CC Sensorless Constant
Current Control
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Integrated Current Control Improves
Efficiency, Lowers Cost, and Reduces
Component Count
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Resistor Programmable
ACT4513
Rev 6, 29-Jul-11
Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
APPLICATIONS
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Car Charger/ Adaptor
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Rechargeable Portable Devices
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General-Purpose CC/CV Supply
GENERAL DESCRIPTION
ACT4513 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.
ACT4513 provides up to 2A output current at
210kHz 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 ACT4513 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.
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Current Limit from 750mA to 2A
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Patented Cable Compensation from 0Ω to
0.5Ω
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±7.5% CC Accuracy
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Compensation of Input /Output Voltage Change
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Temperature Compensation
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Independent of inductance and Inductor DCR
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2% Feedback Voltage Accuracy
Up to 93% Efficiency
210kHz Switching Frequency Eases EMI Design
Advanced Feature Set
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Integrated Soft Start
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Thermal Shutdown
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Secondary Cycle-by-Cycle Current Limit
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Protection Against Shorted ISET Pin
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SOP-8EP Package
CC/CV Curve
6.0
V
IN
= 24V
5.0
ACT4513-001
Output Voltage (V)
4.0
3.0
2.0
1.0
0.0
0.3
V
IN
= 12V
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
Output Current (A)
Innovative Power
TM
-1-
www.active-semi.com
Copyright © 2011 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
