ACT4533 データシートの表示（PDF） - Active-Semi, Inc

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ACT4533

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

Active-Semi, Inc 

ACT4533

Rev 1, 25-Feb-13

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

FEATURES

• 40V Input Voltage Surge

• 32V Steady State Operation

• Up to 3A Output Current

• Constant Current Output with Input up to 32V

• Output Voltage up to 12V

• 125kHz Switching Frequency Eases EMI Design

• Good EMI Performance to Pass EN55022

Radiation Regulation without adding EMI

Components

• 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

− Patented Cable Compensation from 0 to 0.3Ω

• ±7.5% CC Accuracy

− Compensation of Input /Output Voltage Change

− Temperature Compensation

− Independent of inductance and Inductor DCR

• 2% Feedback Voltage Accuracy

• Up to 92% Efficiency

• Advanced Feature Set

− Integrated Soft Start

− Thermal Shutdown

− Secondary Cycle-by-Cycle Current Limit

− Protection Against Shorted ISET Pin

• SOP-8EP Package

APPLICATIONS

• Car Charger/ Adaptor

• Rechargeable Portable Devices

• General-Purpose CC/CV Supply

GENERAL DESCRIPTION

ACT4533 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.

ACT4533 provides up to 3A output current at

125kHz 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 ACT4533 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.

Innovative PowerTM

-1-

CC/CV Curve

6.0

VIN = 24V

5.0

4.0

VIN = 18V

3.0

VIN = 12V

2.0

1.0

0.0

0

400 800 1200 1600 2000 2400 2800

Output Current (mA)

www.active-semi.com

Copyright © 2013 Active-Semi, Inc.

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