ACT4515(2011) データシートの表示（PDF） - Active-Semi, Inc

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ACT4515
(Rev.:2011)

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

Active-Semi, Inc 

Active-Semi

ACT4515

Rev 4, 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 Active CC 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 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

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.

Innovative PowerTM

-1-

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

250

500

750 1000 1250 1500

IOUT Current (mA)

www.active-semi.com

Copyright © 2011 Active-Semi, Inc.

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