ACT4515
Rev 6, 14-Nov-12
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 Active CC Constant Current
Control
−
Integrated Current Control Improves
Efficiency, Lowers Cost, and Reduces
Component Count
•
Resistor Programmable Outputs
APPLICATIONS
•
Car Charger
•
Rechargeable Portable Devices
•
General-Purpose CC/CV Supply
GENERAL DESCRIPTION
ACT4515 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.
ACT4515 provides up to 1.5A 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 high-
brightness LED drive for architectural lighting. The
ACT4515 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.
−
Current Limit from 400mA to 1500mA
−
Patented cable compensation from 0Ω to 0.5Ω
•
±7.5% CC Accuracy
−
Compensation of Input/ Output Voltage Change
−
Temperature Compensation
−
Independent of Inductance and Inductor DCR
•
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
CC/CV Curve vs. Load Current
6.0
5.0
ACT4515-001
V
0UT
= 5V
Output Voltage (V)
4.0
3.0
2.0
1.0
0.0
0
250
500
750
1000
1250
1500
V
IN
= 12V
V
IN
= 24V
I
OUT
Current (mA)
Innovative Power
TM
-1-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
